Help upgrading an HP Pavilion a6407c?


Jan 2, 2013
Hi guys, I am currently looking to upgrade my computer for use as a mid level gaming computer. I am looking to play various Source engine games such as Counterstrike, HL2, Garry's mod, and the like. A friend of mine recommended that I look into getting a new graphics card, He suggested that I look into the GeForce 8400 GS and the Geforce 210. I have very limited knowledge on the subject of computer upgrades and am wondering if these are good choices and if they are compatible with my system? I am also wondering if installing one of these would allow my computer to properly run Garry's mod and other source games?

Links to Cards :

8400 GS : EVGA
Zotac :

210 : EVGA
Gigabyte :

My current specs (Yes they are old, circa 2008)

32 bit OS (Vista)
Processor : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
Display adapter type : NVIDIA GeForce 6150SE nForce 430

Link to Newegg page of my full computer specs :

Thank you for your time,