Overclocking!?

Ok as some of you may know, I just bought a Galaxy 7900gs pci-e 256mb video card

I have a compaq presario pc and have no overclocking functionality in my bios.

I installed an accelero S1 with Turbo module to the video card bring the idle from 55 to 35.

i have now apparently overclocked from 450/700 to 633/807 using nvidia ntune.

My idle is now 40 degrees celcius.

Does this sound right? Or is my computer going to explode.

I also have a 450w coolermaster psu with a pentium 4 550 and two hard drives on it.

Install ATI-Tool and you can check for stability.

Well i just did another 3d mark any my score went from 4800 to 2000 so i just reverted to original

Now running 610/820 does that sound good to everyone idle @40 load @ 48

Temps look good .. check your stability with a few looped 3D06 runs and if its stable then keep on goin