Thanks for your replies.
Maybe 8 GB of RAM might be a good idea.
Yes, what about CORSAIR 8GB DDR3 XMS3 VENGEANCE PC3-12800 1600MHZ CL9 (2X4GB)?
why not go i5 2500K ? OCing hasn't been easier.
You are right, I just wanted the on-board video and I thought clocking would make the computer less silent? (but maybe that makes it possible to downclock it as well
Also if you go 2500K you'll want a P67 motherboard to be able to overclock it.
ASUS P8P67 PRO - sounds good?
Yes, but at full load a GTX 460 will be using 40-50W more power, that's 40-50% more heat produced by the video card. Where is that heat going to go? Most heat stays in the case.
I am convinced, I will change the graphic card to ASUS RADEON HD6850.
But I would get a Seasonic "Fan-cooled" power supply. I know the fanless work pretty good but the fan-cooled one I think will be better overall for a system making that much heat.
Now, with the HD6850 making less heat, maybe the fanless is the best choice? I have a hard time deciding between them. I just want the one that (safely) gives me the quietest computer overall.
If you want silent, I think an aftermarket cooler is the only choice- such as GeLid Icy Vision or the Thermaltake unit.
What about replacing the fan on the HD6850 to the passive cooler ARCTIC COOLING ACCELERO S1 REV2 and maybe add an extra 120mm fan (gentle typhoon) on top of it?
I am also considering replacing the seagate hard drive to WESTERN DIGITAL CAVIAR GREEN 2TB SATA/300 64MB - I heard the seagate is less reliable and that the WD maybe is a bit quieter.