Okay so I'm at the office and not with my desktop at home, but I was able to get the service tag/parts info for it.
SpoilerParts# || Part Description
T845M || INSTRUCTION..., TRIGGER..., SVC TAG
C158J || KIT..., DOCUMENTATION..., SERI/WSI, ENGLAND/ENGLISH..., DAO/BCC
J229H || KIT..., Software, VB32SP1A, Digital Video Disk Drive, Multiple, 5
CP541 || Assembly, Heatsink, Shroud Performance, Motley Crue Desk Top
J8461 || ASSEMBLY..., CABLE..., VIDEO..., LEAD FREE...
M576D || Assembly, Panel, Filler, 3.5 inchForm Factor, BJMT/MCDT
H026G || Kit, Software, Roxio, Creator 9.0-01, Business
HY281 || Hard Drive, 80G, S2, 7.2K, 8M Lead Free, SGT-NH
K123H || Kit, Software, Powerdvd, 8.1-00 Digital Video Disk Drive 0 83535 INFORMATION..., PART, ADVANCED TECHNOLOGY ATTACHMENT PACKET INTERFACE..., DEVICE
D568C || Assembly, DVD+/-RW..., 16X Half Height, Serial Ata, PLDS
F357H || Processor, Q9550, 2.83, 12MB Yorkfield, E0
J9256 || KIT..., CABLE..., NVIDIA..., VIDEO GRAPHICS ADAPTER..., DIGITAL VIDEO INTERFACE..., LEAD FREE...
PU214 || Kit, Mouse/Keyboard, UNITED STATES..., DT Vista, AMF
Y103D || Card, Graphics, 256, Loop, OUGA6
5120P || Cord, Power, 125V, 6Feet, SJT..., Unshielded
F619D || ASSEMBLY..., CHASSIS..., MCDT, PWA INTEGRATED..., 960, ENVIRONMENTAL PROTECTION AGENCY..., THIRD PARTY MAINTENANCE...
U522F || INSTRUCTION..., DEV-TO-MCDT-L5.5, ENVIRONMENTAL PROTECTION AGENCY..., 960
(2) YG410 || Dual In-Line Memory Module 2G, 800M, 256X64, 8, 240, 2RX8
^no idea what half of these things mean
After looking at pictures of SFF & minitower/desktop cases, I think my PC is actually a "midsize desktop" .. I'll have to edit the title of the thread, but I'm not 100% sure. I used to think my case was MT, so I bought an HD6xxx only to see it won't fit due to it being too long and too thick in depth.
Really not sure, I'll update about it when I get home at 7:30pm EST.
(I'm second-guessing myself because after looking at a picture of the PSU in smallformfactor, I knew my psu did NOT look like that, but I haven't opened the case in months so it's possible my memory is just that terrible)
I'll definitely open the panel and see the what the amperage is on it.
If anything I'd replace the card back once I've no need for the desktop.
Thanks for the response, I'll check this thread again once I get home.