Best Overall Value
Price: £39.93 | Rating: ★★★★★ (5.0)
Here's the thing: when you're hunting for the best RGB computer cases under £100, you don't always need to spend anywhere near the ceiling. The 1ST PLAYER Trilobite T3 proves that point convincingly. At under £40, it delivers ARGB lighting that actually looks good through the tempered glass side panel, a build quality that feels more expensive than it is, and a compact Micro-ATX footprint that suits smaller desk setups perfectly.
The ARGB fans included in the box are a genuine bonus. A lot of cases at this price ship with plain fans or no fans at all, so getting lit fans ready to go out of the box is proper decent value. Cable management is tighter than you'd get in a full-size mid-tower, which is the main trade-off with the mATX form factor. But if your build is compact by design, that's not really a problem.
Airflow is reasonable rather than exceptional. The front panel isn't a full mesh design, so if you're pushing a high-end GPU hard, you'll want to keep an eye on temperatures. For mid-range builds with a decent CPU cooler, it's absolutely fine. The build process is straightforward, with tool-free panel removal making things easier for first-timers.
For anyone building a budget gaming rig and wanting that RGB glow without spending serious money, this is the one to beat in the best RGB computer cases under £100 category. It's our top pick for a reason.
Pros
- Exceptional value at under £40
- ARGB fans included in the box
- Solid build quality for the price
- Tempered glass side panel looks great
- Compact mATX footprint suits smaller desks
Cons
- Micro-ATX only, no full ATX support
- Front panel airflow could be better
- Tighter cable management space than larger cases
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Best for Beginners
Price: £48.99 | Rating: ★★★★☆ (4.0)
GAMDIAS isn't a brand that gets talked about as much as it should. The AURA GC1 ELITE is a proper mid-tower with a mesh front panel, four 120mm ARGB fans pre-installed, and tool-free tempered glass removal. At just over £90, it sits near the top of the budget range, but the spec sheet justifies it.
That mesh front panel is the headline feature for anyone who cares about thermals. Solid glass fronts look stunning but they choke airflow. Mesh doesn't. With four ARGB fans pulling air through a proper mesh intake, this case will keep temperatures noticeably lower than glass-fronted alternatives at a similar price. If you're fitting a mid-range GPU and a decent CPU, that matters.
Tool-free installation is a nice touch. The tempered glass side panel clips in and out without needing a screwdriver, which makes cable tidying and component swaps much less of a faff. The interior layout is well thought out with good cable routing channels and a PSU shroud that keeps the bottom of the case looking tidy.
The ARGB lighting from the four included fans is vibrant and syncs with most major motherboard RGB software. It's not the most sophisticated lighting system, but it looks great and it works. For a case focused on airflow and RGB together, the GAMDIAS AURA GC1 ELITE is one of the stronger options in the best RGB computer cases under £100 bracket.
Pros
- Mesh front panel for genuine airflow improvement
- Four 120mm ARGB fans included
- Tool-free tempered glass removal
- Good cable management layout
- PSU shroud keeps the build looking clean
Cons
- Sits near the top of the budget range at £90
- GAMDIAS brand has less community support than bigger names
- RGB software compatibility can vary by motherboard brand
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Best Build Quality
Price: £69.95 | Rating: ★★★★½ (4.7)
Lian Li cases have a reputation for quality that's well earned, and the V100 carries that forward at a mid-range price of around £70. It's a clean, well-built mid-tower with solid expandability and a layout that experienced builders will appreciate. The tempered glass side panel shows off your components nicely, and the overall construction feels noticeably more solid than cheaper alternatives.
For RGB builds specifically, the V100 gives you a good canvas. It doesn't come loaded with pre-installed ARGB fans, so you'll need to factor in the cost of fans separately. But the fan mounting positions are generous, and the case supports both 120mm and 140mm fans across the front, top, and rear. Pair it with a set of ARGB fans and you've got a genuinely attractive build.
Cable management is where Lian Li cases consistently shine, and the V100 is no exception. There's proper routing space behind the motherboard tray, velcro straps in sensible positions, and enough room to keep things tidy without fighting the case. For builders who care about the inside looking as good as the outside, that matters.
It's not the flashiest option in this roundup and it won't win on fan count out of the box. But if you want a solid, well-made foundation for an RGB build and you're happy to choose your own fans, the Lian Li V100 is a dependable choice.
Pros
- Lian Li build quality at a mid-range price
- Excellent cable management routing
- Good fan mounting flexibility
- Solid expandability for future upgrades
Cons
- No ARGB fans included in the box
- Less visually exciting than competitors with pre-installed lighting
- Adds cost if you need to buy fans separately
Buy on Amazon£69.95
Best Compact ATX
Price: £88.38 | Rating: ★★★★½ (4.7)
The O11 Dynamic is one of the most popular case designs in PC building, and the Mini V2 brings that dual-chamber layout into a more compact package. It's a smart choice if you want ATX support without the bulk of a full-size mid-tower. The modular layout means you can configure fan and radiator positions to suit your cooling setup, which is genuinely useful for custom loop builders.
Tempered glass on the side gives you a clear view of the interior, and the white finish looks clean and modern. For RGB builds, the O11 Mini V2 is a great showcase case. The dual-chamber keeps cables out of sight, so your ARGB fans and GPU lighting take centre stage without a mess of cables ruining the effect.
The modular design does add some complexity to the build process. It's not the most beginner-friendly case in this roundup. But for builders with a bit of experience who want flexibility in their cooling layout, it's worth the extra effort. Radiator support is generous for a compact case, and the overall build quality is exactly what you'd expect from Lian Li.
Pros
- Compact ATX with dual-chamber design
- Modular layout for flexible cooling configuration
- Excellent Lian Li build quality
- Clean white finish looks great with RGB lighting
Cons
- More complex build process than simpler cases
- No fans included
- Compact size limits some cooling configurations
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Best Unique Aesthetic
Price: £81.99 | Rating: ★★★★½ (4.8)
This one is genuinely different. The Lian Li A3 Wood Edition uses real wood panelling on the exterior, giving it a look that stands out completely from the sea of tempered glass and mesh cases. It's a Micro-ATX case, so it's compact by nature, and the wood finish gives it a warmth that most PC cases simply don't have.
For RGB builds, the wood exterior creates an interesting contrast with interior lighting. ARGB fans glowing through the tempered glass side panel against a wood exterior is a distinctive look. It won't be for everyone, but if you want a build that people actually stop and look at for the right reasons, this delivers.
Build quality is solid throughout. It's Lian Li, so the steel frame is well made and the fit and finish is good. The wood panels are properly finished, not cheap veneer. Cable management is decent for an mATX case, though tighter than a full mid-tower as you'd expect.
The main limitation is the Micro-ATX form factor. If you're planning a full ATX build, this isn't the case for you. And at £70, you're paying a premium for the aesthetic. But as a niche pick for someone who wants something genuinely different, the A3 Wood Edition earns its place in any best RGB computer cases under £100 list.
Pros
- Genuinely unique wood panel aesthetic
- Solid Lian Li build quality
- Interesting contrast with RGB interior lighting
- Compact mATX footprint
Cons
- Micro-ATX only
- Premium price for the form factor
- Very niche aesthetic won't suit everyone
- No fans included
Buy on Amazon£81.99
Best Under £100
6. Geekworm Raspberry Pi 4 Aluminum Case - Heavy Duty Passive Heat Dissipation Metal Case for Raspberry Pi 4B Only
Price: £11.99 | Rating: ★★★★½ (4.7)
Look, this one needs to be addressed directly. The Geekworm Raspberry Pi 4 Aluminum Case is not a PC case in any meaningful sense for this roundup. It's a small aluminium enclosure for a Raspberry Pi 4B, designed for passive cooling. There's no RGB lighting, no fan support, no ATX compatibility, and no relevance to the best RGB computer cases under £100 category whatsoever.
It's a well-made product for what it is. The aluminium construction acts as a heatsink, keeping the Pi cool without any fans. At this price, it's good value for Pi enthusiasts. But if you're here looking for a gaming PC case, this isn't it. Skip it entirely and look at the other options in this roundup.
Pros
- Good passive cooling for Raspberry Pi 4B
- Solid aluminium construction
- Very affordable
Cons
- Not a PC case, not relevant to this roundup
- No RGB lighting whatsoever
- Raspberry Pi 4B only, no other compatibility
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Fan Upgrade Add-On
Price: £79.99 | Rating: ★★★★½ (4.7)
Another product that needs a bit of context. The Lian Li UNI FAN SL-INF is a fan, not a case. It's an excellent fan with a genuinely impressive infinity mirror ARGB effect, and if you're upgrading the fans inside one of the cases in this roundup, it's worth knowing about. But it's not a case itself.
At this price per fan, it's a premium add-on that makes sense if you're buying a case like the Lian Li V100 or O11 Mini V2 that doesn't include fans. The infinity mirror effect is one of the most visually striking ARGB fan designs available. The reverse blade design also improves airflow characteristics compared to standard fan layouts.
If you're building a showcase RGB system and you want the fans to be as impressive as the case, these are worth the investment. But they're a supplement to the cases in this roundup, not a replacement for one.
Pros
- Stunning infinity mirror ARGB effect
- Reverse blade design improves airflow
- Premium Lian Li build quality
Cons
- A fan, not a case
- Expensive per unit
- Not relevant as a standalone purchase for this roundup
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Replacement Panel Only
Price: £69.99 | Rating: ★★★★½ (4.5)
The Lian Li A3-mATX Tempered Glass Panel is exactly what it says. A replacement tempered glass side panel for the Lian Li A3-mATX case. If you already own that case and you've cracked or scratched the original panel, this is the part you need. It's well made, as you'd expect from Lian Li, with a steel and aluminium frame holding the tempered glass securely.
But it's not a case. It has no relevance to anyone shopping for the best RGB computer cases under £100 unless they already own the specific Lian Li A3-mATX and need a replacement panel. At this price for a single panel, it's also expensive in isolation. Worth knowing about if you're in that specific situation. Otherwise, look elsewhere in this roundup.
Pros
- Quality Lian Li construction
- Steel and aluminium frame is solid
- Direct replacement for A3-mATX owners
Cons
- Not a complete case
- Only relevant to existing A3-mATX owners
- Expensive for a single replacement panel
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