OK first of all, I would go into the BIOS and have a poke around and see what the settings are, as it is I'd say that 9600GT is pretty well matched to your CPU but it's still worth trying to OC it as it will help you in games that utilise your CPU heavily, or in folding/benching tasks.
If you increase the FSB in the BIOS, make sure you're ram isn't getting more than the rated voltage on the DIMM (should say on the sticker) by setting it in the BIOS manually so it doesnt decide to auto up it itself. If you start getting memory errors in stability tests, you can try upping the memory voltage but you do this at your own risk and it may not be worth it if you don't think the ram is up to it. There are several ways of dissapating excess heat from the RAM, a simple solution is a 80 or 92mm fan blowing directley onto the memory modules, or you can get some heatspreaders like these:
http://www.filron.com/uk/index.php?act=viewProd&productId=22214
If you are worried about your memory, you can avoid overclocking it and just overclock the cpu by setting the FSB : DRAM ratio to 1:1 in your BIOS. This means the ram will work at the same speed as the FSB but remember it's DDR [Double Data Rate] so for example your CPU has an "FSB" of 1066MHz, first you divide this by 4 to get the true FSB [the one you see in the BIOS, and the one you're concerned with when OCing]. So your E6320 has an FSB of 266MHz by default. Now if you set the RAM in the BIOS to a 1:1 ratio with that FSB, then it will run at 2*266 because it's DDR- this gives you a speed of 533MHz, which is below your RAM's rated [667MHz] so you can then up the FSB without worrying about the RAM. Remember to go in small stages each time- slow and steady, and when the OC isn't stable anymore just go back to the last FSB that was running stable.
Sorry for the long post but it's pretty tricky to explain this stuff- for me at least lol, hope it helps.
EDIT/: Aww noes mate i typed all that then I just saw your other thread lol about gettin a new mobo, it is probably the best option as if none of that will work with the DP965LT then you're just about stumped until you replace it. nvm maybe it will help you if you get round to OCing on a new mobo
