https://wccftech.com/thermaltakes-h550-argb-unveiled-includes-a-tempered-glass-panel/

Thermaltake has announced its new case, the H550 TG ARGB case, which uses the same internal chassis G31, G32, and G33. This case offers the ability to support a standard ATX-size motherboard with seven expansions slots with support for up to 300 mm long GPU. With the two vertical expansion slots, it will allow you to show off your fantastic GPU, but only if they are less than 45 mm thick; otherwise, you might not be able to close the large tempered glass panel.

The radiator installed with a RAM height clearance of 40 mm, support for up to a 165 mm tall CPU cooler, and support a PSU up to 200 mm long but with the hard drive rack installed the supported length for a PSU goes down to 160 mm in length. The PSU cover does have a window to ensure that your high-end PSU will be seen and appreciated.