The Thermaltake Level 20 HT measures in at 613 x 468 x 503mm. Or 24.13 x 18.43 x 19.8 inches if you so prefer. That’s pretty darn big, and the whole thing stands with the size and shape of a rack mount cabinet. It is a full tower, so as you could expect, it’ll support E-ATX motherboards with ease. GPU, CPU, PSU and other clearances just aren’t going to be an issue either. It has 260mm clearance for the CPU cooler, and there isn’t an air cooler on the market that big. The GPU has 400mm clearance and the PSU 200mm clearance. So, a big PC case has lots of space inside, there’s a shocker!