Yes, it's a 5.25" drive. Yes, it works last I checked.
Phenom II 940 at stock
8Gb DDR2-800 (half of it is labelled 1066, but requires huge voltage)
Radeon HD3650, 512M, with ridiculously overkill Arctic Cooling fanless heatsink
1T Samsung F1 hard disc
Two Samsung 203-series DVD burners (one 203N, one 203B)
One LS-120 drive (a cute way to end run the one-floppy limit of most modern boards. The one drawback is finding a bezel; most LS120s you find are external, and have no front panel you can put on a case.)
One 5.25" floppy
One cheap-ass 802.11n card
One Hauppauge HVR-1250
Nah, I fry my CPUs. Never had one die yet. Who cares - by the time you do they'll be cheap or more likely obsolete.
I once had a used laptop which had been upgraded to a 486-100. The 486-100 is a 3.3v part. The board was a 5v board designed for a DX-33 or maybe a DX2-66. It actually worked, for a few minutes at a time. I have the machine sitting on a bookshelf, with a 200M drive containing an OS/2 3.0 install, and a 5x86-133 upgrade circuit in it.