i upgraded my gpu on my dell stuido 540 q9400 2.6 8gigs ram 1tb hd so i up graded from a 9800gt to a evga gtx460 1028 SC i also put a 650 corsair power did all the drivers and that everything seen to be working ok but when i play star craft2 it still lags seems to run the same on the 9800gt good 120 fps last night on the 9800 and under 40 today on the gtx460 i should beble to run this game on full i have a acer 3d monitor ive testted my internet at speed test and pingtest.net i have minimul programs installed im using kaspersky pure
There are two possibilities here. Firstly, which driver version are you running? It may be worthwhile re-installing the Nvidia driver to see if that clears up the problem.
Secondly, SC2 doesn't really benefit from quad core CPU's over duals; it likes high clock speed. Your Q9400 only runs at 2.6GHz, so there is a chance you will not notice the benefit of a faster GPU since the CPU is holding the game back.
That's what I been thinking about but it's at Dell studio 540 and lots of Ppl say you can't oc prebuilt plus I'm new and I don't wanna wreck what I have is there a step by step guide to oc that would be nice
It depends, unfortunately. If the Q9400 has an unlocked CPU multiplier, you could OC it simply by raising the multiplier (Base clock x multiplier = CPU clock). If not, you have to raise the base clock itself, which will affect other components as well. All of this is dependant on your CPU model and what the motherboard BIOS will allow you to do. It also helps to have decent cooling so your CPU doesn't overheat from the (potentially) increased power output.