So, I ended up getting a few things from my brother. I got an Asus M2NPV-VM motherboard w/ Athlon 64 3500+ (the exact same mobo and cpu as my previous setup before the mobo died), along with a case and PSU. He had been having problems with it for a long time and it was just collecting dust, so I took it and put my Athlon X2 7750 and my Radeon 5450 512MB in it and have been using it problem free for the last week.
Fast-forward to today, when I got my GeForce GT 640 2GB in the mail.
I ran some benchmark tests using 3DMark 11 using all 3 video cards listed above, along with my Radeon 5450 512MB, and here are the results.
All benchmarks were done using this setup.
Windows 7 64-bit
AMD Athlon X2 7750 @ 2.7GHz
2x 2GB Mushkin DDR2 @ 400 MHz
2x 1GB OCZ DDR2 @ 333 MHz
80GB Seagate SATA Drive
AMD Radeon HD 5450 512MB: 383
EVGA GeForce GT 610 1GB: 582
Zotac GeForce GT 620 1GB: 835
Zotac GeForce GT 640 2GB: 1954
I still have my aunts computer downstairs with my Phenom X4 9550 (2.2GHz) that I was planning on using to upgrade her computer along with the GT 610, but I think I might
give her the X2 7550 instead with the GT 620, and use the X4 9550 in my computer.