Nvidia cards you can overclock through the nvidia control panal download add
on NTUNE. I used the xp version and it did fine for me under every driver
version for vista so far.
Ati has a similar feture but I am not familiar with it . Hope this helps.
ADM Dual core 4200 +fx 2.75 Ghz
Total amount of system memory 2.75 GB RAM
System type 32-bit operating system
Number of processor cores 2
64-bit capable Yes
Storage
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Total size of hard disk(s) 373 GB
Disk partition (C
223 GB Free (298 GB Total)
Media drive (D
CD/DVD
Media drive (E
CD/DVDCD/DVD
Disk partition (F
72 GB Free (75 GB Total)
Graphics
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Dual Sli Nvidia 7900 GS
Display adapter type NVIDIA GeForce 7900 GS
Total available graphics memory 750 MB
Dedicated graphics memory 256 MB
Dedicated system memory 0 MB
Shared system memory 494 MB
Display adapter driver version 7.15.10.9746
Primary monitor resolution 1280x1024
DirectX version DirectX 9.0 or better
Network