I am trying to squeeze a little extra life outta my old Core2Duo in anticipation of Crysis. I know my CPU will run at 3.2ghz with no problems. I used to run at that speed when I only had 2GB (2x1gb)memory onboard and it was rock solid. Core2Duo e6300 1.86 @ 3.2ghz G.Skill 2GB (2x1GB) Geil 1GB (2x512mb) A couple oy years ago I bought an extra 1GB (2x512) and when I plugged them in I found that I couldn't run the memory at anything other than stock - this meant I had to take down the CPU to 2.8ghz. I figured the new memory wasn't able to OC. However, tinkering today I removed a pair of modules and bumped up the speed back to 3.2ghz. Again no problem - my intention was to buy another pair of 1GB sticks of the same kind as my originals thinking I could run them all at at least 3.2ghz. I noticed however that I had removed the 2gb by mistake. So it seems either pair will run at 3.2ghz just fine they just won't run at that speed together. Anyone have an explanation why?