The HAF 925 has a whole lot of drive bays mounted to the front of the casing but they’re removable and you could move it to the 915R portion if that floats your boat.
As with Cooler Master’s casings, the black metal finish on the interior with ample space for your components.
The 925 comes with rubber-covered holes at the bottom. You might wonder what is it for, well being a Stacker unit, this means you can actually put other 915R/F cases under it, or perhaps even another 925.
My only gripe over the 925 part is that it doesn’t have much room at the top. Mounting the all-in-one’s fan and radiator is just impossible.
Next up is the 915R. There are 2 models, of the 915. The 915R has PSU mounting bay at the back while the 915F has the PSU mounting bays in front. R for Rear, F for Front.
The HAF 935 comes with HAF 915R by default. The 915R seems to be without an IO panel to for Power Button and USB ports which is a real shame.
As mentioned earlier, the 915R has the PSU bay at the back. The down side of the 915R is that the PSU literally blocks the entire upper area of the motherboard so there’s no way for you to use heatsinks other than stock heatsink, either that or some low profile 3rd party heatsink.
Note also that the 915R does not come with rubber paddings at the bottom.