KXRORS S300 Mini-ITX PC Case

KXRORS S300 Mini-ITX PC Case — image 1
KXRORS S300 Mini-ITX PC Case — image 2
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KXRORS S300 Mini-ITX PC Case — image 4
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KXRORS S300 Mini-ITX PC Case — image 6
KXRORS S300 Mini-ITX PC Case — image 7
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71%
29%
88%
Build Quality & Materials
84%
Portability & Handling
67%
Airflow & Thermal Performance
53%
CPU Cooler Compatibility
72%
GPU Compatibility & Fit
61%
PCIe Riser Cable & Setup
83%
SFX Power Supply Support
79%
Front I/O & Connectivity
71%
Cable Management
82%
Aesthetics & Visual Design
76%
Value for Money
66%
Assembly & Build Experience
57%
Documentation & Packaging
58%
Fan & Radiator Support
More

Overview

The KXRORS S300 Mini-ITX PC Case is a compact 8.1-liter aluminum enclosure built for builders who want a portable gaming rig without sacrificing build quality. Measuring 312 x 135 x 193mm and weighing just 4.4 lbs, it sits comfortably in the mid-range ITX market — more affordable than boutique options like the Velkase Velka series, yet more refined-feeling than budget plastic alternatives. The black anodized finish and top leather carry handle make it an obvious pick for LAN party regulars. Before anything else, though: if you're running a PCIe 3.0 GPU, you must set your motherboard BIOS to PCIe Gen3 before first boot, or the system simply won't POST.

Features & Benefits

The S300's three-sided mesh panels are its most practical asset — they allow for genuine passive airflow without requiring you to remove side panels or mod anything. The front I/O is more capable than you'd expect at this size, offering both USB 3.0 Type-C and Type-A ports. SFX and SFX-L power supplies up to 130mm fit without issue, which opens up solid options like the Corsair SF series. The included PCIe 3.0 riser cable handles vertical GPU orientation neatly, though GPU selection requires care: cards must stay under 305mm long, 55mm tall, and 130mm wide — roughly the footprint of an RTX 4060 or RX 6600. Built-in cable routing channels help manage the inevitable spaghetti inside such a tight chassis.

Best For

This compact ITX case is genuinely well-suited for anyone who hauls their rig to LAN events or simply needs a system that doesn't dominate a desk. The 60mm CPU cooler limit is a hard constraint — it rules out most tower coolers immediately, so plan on something like a Noctua NH-L9i or a similarly flat alternative. If you're pairing mid-range components where heat output stays reasonable, thermal management is workable. It's also a solid pick for someone who wants that premium aluminum build quality without stepping up to boutique pricing. Builders who prefer plug-and-play simplicity over BIOS tweaking, however, may find the setup requirements mildly frustrating straight out of the box.

User Feedback

Across 287 ratings, the S300 holds a 4.5-star average that reflects genuine buyer satisfaction rather than inflated numbers. The most consistent praise centers on build quality and finish — people are repeatedly surprised by how solid the aluminum feels relative to the price. On the critical side, the CPU height restriction catches buyers off guard more than any other issue. Thermal performance under sustained GPU load also draws mixed reactions; the mesh helps, but heat does accumulate in a small enclosure when components are running hard. The leather carry handle earns unexpected appreciation — it's a small practical touch that reviewers mention unprompted, and it genuinely sets this case apart visually from competing options.

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Pros

  • Brushed aluminum construction feels noticeably more premium than plastic alternatives at a comparable price.
  • The top leather carry handle is genuinely practical — not a cosmetic gimmick — for frequent transport.
  • Three-sided mesh panels provide passive airflow that keeps mid-range builds running at reasonable temperatures.
  • SFX and SFX-L PSU support up to 130mm opens the door to quality units from Corsair, Seasonic, and others.
  • Front USB 3.0 Type-C port is a welcome inclusion that many competitors skip at this size and price tier.
  • The bundled PCIe 3.0 riser cable saves you from sourcing an overpriced accessory separately.
  • At 4.4 lbs empty, the S300 is light enough to carry comfortably even with a full build inside.
  • Clean, minimal aesthetic ages well and does not rely on RGB or acrylic panels that can look dated quickly.
  • Compact dual-fan GPUs like the RTX 4060 fit cleanly without forcing or requiring panel removal tricks.
  • Built-in cable routing channels make organization achievable for experienced builders working in tight spaces.

Cons

  • The 60mm CPU cooler height limit eliminates most popular air coolers and forces a costly replacement for many buyers.
  • No mention of the critical PCIe Gen3 BIOS requirement in clear packaging documentation causes widespread boot failures.
  • Heat accumulates noticeably under sustained GPU loads, making this a risky choice for high-TDP component pairings.
  • SFX PSU compatibility means buyers transitioning from ATX builds face an unplanned additional purchase.
  • The 2.5-slot GPU height cap cuts off a growing number of modern mid-to-high tier graphics cards.
  • Fan mounting is limited to slim 15mm and 10mm options — standard 25mm fans will not fit at all.
  • Minor panel alignment inconsistencies have been reported on some units, undercutting the premium build impression.
  • There is zero liquid cooling or radiator support, leaving no upgrade path if air cooling proves insufficient.
  • The instruction manual is too sparse for the complexity of the build, particularly around BIOS configuration steps.
  • The leather handle stitching showed early wear for some frequent-transport users, raising long-term durability questions.

Ratings

The KXRORS S300 Mini-ITX PC Case earned its scores through AI-driven analysis of verified buyer reviews sourced globally, with spam, bot-generated, and incentivized feedback actively filtered out before any scoring was applied. Ratings reflect the full spectrum of real builder experiences — from first-time SFF enthusiasts to seasoned LAN party regulars — capturing both the genuine strengths and the frustrations that show up repeatedly across hundreds of honest assessments. Nothing has been smoothed over: where pain points are consistent, the scores reflect that directly.

Build Quality & Materials
88%
The wire-draw aluminum finish consistently impresses buyers who handle the case in person for the first time. Compared to similarly priced plastic-bodied competitors, the S300 feels noticeably more rigid and premium, and the black anodized surface resists fingerprints better than most alternatives at this size.
A subset of reviewers noted minor panel alignment inconsistencies out of the box, particularly around the mesh side sections. While not structurally significant, it does undercut the premium impression slightly for buyers with high fit-and-finish expectations.
Portability & Handling
84%
At 4.4 lbs empty, the S300 is genuinely light enough to carry to a LAN event without strain. The top-mounted leather handle is a standout detail — it sits naturally in the hand and feels sturdy enough for regular use, not like an afterthought bolted on for marketing purposes.
The handle works well for short carries, but there is no secondary grip point, so transporting a fully loaded system over longer distances gets awkward. A few users also noted the handle stitching showed early wear after repeated use.
Airflow & Thermal Performance
67%
33%
The three-sided mesh panel layout does meaningful work in passive airflow scenarios, and builders running mid-range GPUs like an RTX 4060 reported acceptable thermals during normal gaming sessions. The open mesh design at least avoids the stifling heat buildup common in sealed small-form-factor cases.
Under sustained loads — long gaming sessions, rendering workloads — heat accumulates noticeably inside the 8.1L enclosure. Builders pushing higher-TDP components reported thermal throttling concerns, and the limited fan mounting options make active cooling improvements difficult without creative modifications.
CPU Cooler Compatibility
53%
47%
For builders already planning around low-profile coolers like the Noctua NH-L9i or Thermalright AXP90, the 60mm ceiling is workable and the case accommodates them without clearance drama. Those who do their homework before buying rarely run into issues.
This is the single most common source of buyer frustration. The 60mm CPU cooler height limit eliminates the vast majority of popular air coolers outright, and many buyers discover this only after purchasing. There is no workaround short of replacing the cooler entirely, which adds unexpected cost.
GPU Compatibility & Fit
72%
28%
Cards up to 305mm long fit without forcing, and single-fan or dual-fan compact GPUs like the RX 6600 or RTX 4060 slot in cleanly. The bundled riser cable handles the vertical orientation reliably once the BIOS setting is correctly configured, and the overall GPU installation process is straightforward.
The 55mm height limit (2.5 slots) cuts off a growing number of modern triple-slot GPUs, including many mid-to-high tier cards that buyers in this price range might reasonably want to pair with the build. The 130mm width constraint is also tighter than it appears on paper for some blower-adjacent designs.
PCIe Riser Cable & Setup
61%
39%
The included PCIe 3.0 x16 riser cable saves buyers from sourcing a separate accessory, which is genuinely appreciated given how overpriced standalone riser cables can be. When the BIOS Gen3 setting is correctly applied, the cable performs without noticeable stability issues for most users.
The mandatory BIOS PCIe Gen3 configuration step is not prominently documented in the physical packaging, and it is the root cause of the most alarming buyer complaints — systems that simply refuse to boot. This is a fixable issue but causes real frustration for builders who do not know to look for it.
SFX Power Supply Support
83%
Supporting SFX and SFX-L units up to 130mm opens up a strong selection of quality PSUs including the Corsair SF series and Seasonic Focus SGX, which are well-regarded in the SFF community. The mounting is clean and the PSU sits securely without movement or vibration transfer during transport.
Standard ATX power supplies are completely incompatible, which adds cost for buyers transitioning from a full-size build. SFX units at adequate wattage carry a notable price premium over ATX equivalents, so the total build cost is higher than the case price alone suggests.
Front I/O & Connectivity
79%
21%
Having both USB 3.0 Type-C and USB 3.0 Type-A on the front panel is a genuine convenience advantage for a case this size. Plugging in peripherals, flash drives, or charging a device mid-session without reaching around to the rear I/O is something users appreciate more after the build is complete.
There is no USB 2.0 header on the front panel, which is a minor inconvenience for builders with older peripherals or AIO pump connectors that rely on 2.0 headers. The power button also received occasional criticism for feeling slightly soft compared to the otherwise solid chassis.
Cable Management
71%
29%
The aluminum chassis includes dedicated routing channels that do provide meaningful organization opportunities, especially for experienced builders who plan their cable runs before installation. Compact SFX PSUs with modular cabling make the process considerably more manageable inside this enclosure.
The interior space is genuinely tight, and less experienced builders report the cable management process as stressful and time-consuming. With a fully modular SFX PSU, a riser cable, and a low-profile cooler all competing for the same limited interior volume, there is very little margin for error.
Aesthetics & Visual Design
82%
18%
The clean, utilitarian aesthetic of the brushed aluminum exterior stands out on a desk in a way that flashy acrylic-windowed cases do not. The black anodized finish photographs well and ages gracefully — no cheap paint that chips, no plastic that yellows over time.
There is no tempered glass panel or RGB lighting support, which is a deliberate trade-off rather than an oversight, but it does put the S300 outside consideration for builders who want their components visible. The purely functional look will not appeal to everyone in the gaming PC market.
Value for Money
76%
24%
For an aluminum-bodied Mini-ITX case with a riser cable included, the S300 represents genuine value relative to boutique-tier alternatives. Buyers who compare it against plastic cases at a similar price point consistently feel they are getting more for their money in terms of material quality and overall feel.
When you factor in the required SFX PSU purchase and potentially a new low-profile cooler, the effective entry cost climbs considerably beyond the case price. Buyers who already own these components will feel the value much more than those building from scratch.
Assembly & Build Experience
66%
34%
Builders with prior ITX or SFF experience generally found the assembly process logical and the screw placement accessible. The panel removal mechanism is straightforward, and the overall construction does not require specialized tools or contortionist-level dexterity.
First-time ITX builders consistently rate the experience as more difficult than expected. The tight tolerances, the BIOS prerequisite, the PSU format requirement, and the cooler height constraints collectively create a steeper learning curve than a standard mid-tower build would ever present.
Documentation & Packaging
57%
43%
The case arrives well-protected with adequate foam padding, and the included hardware kit covers the basic mounting needs without obvious omissions. Most components are bagged and labeled well enough for an experienced builder to identify quickly.
The instruction manual is sparse and does not address the critical PCIe Gen3 BIOS requirement with sufficient urgency — arguably the most consequential omission in the entire package. Better documentation alone would eliminate a significant portion of the negative reviews this case has received.
Fan & Radiator Support
58%
42%
The bottom fan mounts accept a 120x15mm slim fan and an 80x10mm fan, which does allow for some degree of active airflow augmentation. For users running lower-TDP CPUs and efficiency-focused GPUs, this is often sufficient to maintain comfortable operating temperatures.
There is no support for standard 25mm-thick fans or any form of liquid cooling radiator, which significantly limits cooling upgrade paths. Builders who later want to improve thermals will find the options frustratingly narrow compared to similarly sized cases from competitors like Cooler Master.

Suitable for:

The KXRORS S300 Mini-ITX PC Case is a strong match for builders who treat portability as a genuine priority rather than a marketing checkbox — particularly LAN party regulars who want to carry a capable gaming rig without the bulk of a traditional tower. If you already own or are planning to buy an SFX power supply and a low-profile CPU cooler like the Noctua NH-L9i, you will slot right into the S300's requirements without any friction. It also suits enthusiasts who have outgrown cheap plastic ITX cases and want brushed aluminum construction at a price that does not require boutique-level spending. Builders pairing mid-range GPUs — something in the compact dual-fan range like an RTX 4060 or RX 6600 — will find the clearance constraints workable and the mesh ventilation adequate for normal gaming loads. Anyone comfortable navigating a BIOS menu and planning a tight cable run will have a satisfying build experience with this enclosure.

Not suitable for:

The KXRORS S300 Mini-ITX PC Case is a poor fit for builders who want to drop in any full-size tower cooler, since the strict 60mm CPU height ceiling eliminates nearly every popular air cooler on the market and forces a deliberate cooler selection before anything else is purchased. If you are eyeing a high-performance triple-slot GPU or anything with a large heatsink footprint, the GPU clearance limits will likely block your preferred card outright. Builders planning to push high-TDP components — a top-tier CPU paired with a power-hungry GPU — should also think carefully, because the compact interior does accumulate heat under sustained loads and there is no liquid cooling support to fall back on. This is equally not the right case for first-time PC builders who want a forgiving, well-documented assembly experience; the BIOS Gen3 prerequisite and the tight tolerances reward experience rather than patience. Finally, if you already own an ATX power supply, you will need to budget for an SFX replacement, which adds real cost to an otherwise accessible price point.

Specifications

  • Dimensions: The case measures 312 x 135 x 193mm (L x W x H), making it one of the more slender options in the sub-10L Mini-ITX category.
  • Volume: Total internal volume is 8.1 liters, compact enough for a portable build while still accommodating a discrete GPU and SFX power supply.
  • Weight: The empty chassis weighs 2 kg (4.4 lbs), keeping the overall carry weight manageable even with a full build installed.
  • Material: The chassis is constructed from aluminum alloy with a wire-draw surface treatment and a black anodized finish for scratch and corrosion resistance.
  • Motherboard Support: Compatible exclusively with Mini-ITX motherboards conforming to the standard 170 x 170mm footprint.
  • PSU Compatibility: Supports SFX and SFX-L form factor power supplies with a depth between 100mm and 130mm; standard ATX power supplies are not compatible.
  • GPU Clearance: Accommodates graphics cards up to 305mm in length, 55mm in height (equivalent to 2.5 expansion slots), and 130mm in width.
  • CPU Cooler Height: Maximum CPU cooler height is strictly 60mm, which limits compatibility to low-profile air coolers only; tower coolers and standard AIO radiators will not fit.
  • Front I/O: Front panel connectivity includes one USB 3.0 Type-C port and one USB 3.0 Type-A port, along with a combined audio/microphone 3.5mm jack.
  • Fan Support: The bottom of the chassis supports one 120 x 15mm slim fan and one 80 x 10mm slim fan; standard 25mm-thick fans are not compatible with either mount.
  • Cooling Method: Cooling is air-only via three-sided mesh panels that facilitate passive convection; there is no radiator mounting support for liquid cooling solutions.
  • Included Accessories: The case ships with a PCIe 3.0 x16 riser cable pre-installed for vertical GPU mounting, along with a standard hardware and screw kit.
  • Carry Handle: A top-mounted leather carry handle is integrated into the chassis frame, designed for comfortable single-hand transport of a completed build.
  • Expansion Slots: Provides support for one expansion card positioned vertically via the included riser cable, with no secondary horizontal slot configuration available.
  • PCIe Riser Spec: The bundled riser cable operates at PCIe 3.0 x16 bandwidth and requires the motherboard BIOS PCIe speed to be manually set to Gen3 prior to first use.
  • Color Option: Available in a single colorway: S300 Black, featuring a uniform anodized black finish across all aluminum panels.
  • Drive Support: The S300 supports storage installation via the motherboard and PSU cabling only; dedicated 3.5-inch HDD bays are not present in the chassis design.
  • Case Type: Classified as a Mini-Tower / Small Form Factor enclosure, intended for Mini-ITX platform builds in space-constrained or portable-use scenarios.

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FAQ

This is by far the most common issue people run into with this case, and the fix is almost always the same: you need to go into your motherboard BIOS and manually set the PCIe speed to Gen3 before the system will POST with the included riser cable. The case ships with a PCIe 3.0 riser, and if your board defaults to Gen4 or auto-negotiation, it can cause a complete failure to boot. Do this before installing your GPU and you will save yourself a lot of troubleshooting headaches.

Unfortunately the NH-D15 — or any tower cooler for that matter — will not fit. The maximum CPU cooler height is 60mm, which is a hard physical limit of the chassis. You are looking at low-profile options like the Noctua NH-L9i, Thermalright AXP90-X47, or ID-COOLING IS-40X. If you already own a taller cooler, plan to budget for a replacement before buying this case.

It depends heavily on the specific model. The case supports GPUs up to 305mm long, 55mm tall (2.5 slots), and 130mm wide, which rules out most standard dual or triple-fan RTX 4070 cards. Some compact single-fan or short dual-fan variants might technically fit the length and width, but the 2.5-slot height restriction is the most likely blocker. Always cross-check your exact GPU model's dimensions against those three measurements before committing.

No — the S300 is designed exclusively for SFX and SFX-L power supplies in the 100–130mm depth range. Standard ATX units will not physically mount in the enclosure. This is a common hidden cost for buyers transitioning from a full-size build, so factor in the price of a quality SFX unit like the Corsair SF series or Seasonic Focus SGX when budgeting your build.

For mid-range builds — think an RTX 4060 paired with a modest CPU — thermals are generally manageable during typical gaming sessions, especially with the three-sided mesh helping passive airflow. However, if you are running higher-TDP components or doing extended workloads like rendering or long gaming marathons, heat does accumulate noticeably in the 8.1L space. Adding slim intake fans to the bottom mounts helps, but this case is not ideal for high-power component pairings.

Yes, and it pleasantly surprises most people who try it. The handle is stitched directly to the chassis frame rather than attached with cheap rivets, so it holds a completed build without flexing or creaking. Some users who transport their system very frequently did note stitching wear over time, but for regular LAN event use or occasional moves, it holds up well.

No — the S300 is strictly an air-cooling enclosure. There are no radiator mounting points anywhere on the chassis, and the slim fan mounts at the bottom only accommodate 15mm and 10mm thick fans, which rules out any standard AIO pump or radiator combination. If liquid cooling is on your list, this is not the right case.

Noticeably more involved, especially if this is your first ITX build. The tight interior means you need to think carefully about cable routing before you start, and the SFX PSU, riser cable, and low-profile cooler all compete for limited space simultaneously. Experienced SFF builders typically find it manageable, but first-timers should expect the process to take longer and require more planning than a spacious mid-tower would.

Your options are limited but not zero. The bottom panel supports one 120x15mm slim fan and one 80x10mm slim fan, which can meaningfully improve intake airflow when paired with the natural convection from the mesh panels. Standard 25mm fans will not fit in either slot, so make sure any fan you purchase specifically states it is a slim or low-profile variant. Beyond those two mounts, there are no additional fan positions on the chassis.

The black anodized wire-draw finish is more durable than painted surfaces and resists everyday scratching reasonably well. It will not chip or flake the way powder-coated paint can. That said, it is not impervious — sharp edges or abrasive contact will leave marks. Most users who handle it carefully during transport report the finish staying in good condition well past the first year of ownership.