Dan, thank you for this valuable insight into mATX design.Many of these chinese 15L mATX cases have many limitations for CPU cooling or GPU support. The only way to do mATX in 15L and support RTX 4080/4090 is a sandwich based layout.
The smallest possible mATX case including the following features:
- classic hardware layout
- 280 AIO support
- tower heatsinks up to 145mm in height
- SFX and SFX-L support
- GPU with an height up to 145mm (like RTX 4080/4090)
would be 166 x 271 x 390 (WxHxL) = 17.5 L
I think the right way to do mATX is with ATX PSU and 360 AIO support. With the A3-mATX i have a case with these features in the pipeline.
The C4-SFX will go in production next week so the time for feature requests is over.
I genuinely have been wondering for a while what the minimum volume of a properly practical classical layout would be.
17.5L it is!