Overclocked and less frames wtf?

[mowlio]

Ok so i've overclocked my i5 750 to 3.4 which has been fine but i've also overclocked my asus 5850 to 795/1170 on stock volts ran ati tool for around an hour and all was fine so went to play css, portal, mw2 7 bc2 and i get worse frames than before. I mean noticeable i don't have a fps o meter up but its sluggish.

Psu is tagan 900 watt
mobo is p55-us3l

thanks

 

[mowlio]

Also check that you haven't lost half of your system RAM when you overclocked your CPU

how do you mean?

 

[mowlio]

Check you system properties to see how much RAM is displayed in Windows.
If you haven't given your CPU, CPU Vtt or RAM enough volts you may have lost half.

It still says 4gb, maybe it would be worth upping the volts a tiny bit?

i'm open to suggestions!

TY

 

[mowlio]

My ram timings are off if that makes a difference 7-8-9-8 from the SPD tab in cpuz