Hey all. I was running 2x1gb sticks at 1066 without changing any settings. Since getting 2 more sticks to run 4x1gb, my memory now runs at 800mhz. All for sticks are Corsair Dominator 8500 C5D memory. When I go into the MIT settings in bios, it shows the memory as 1066 with all settings at auto, however the voltage is now only 1.8 for the memory, it used to be 2.1 by default. When the system boots up CPUZ shows my fsb:dram as 5:8 and 3D06 detects my 4gb as running at 800mhz. Needless to say, games now run laggy and crap at this setting. Do I need to manually change my system memory multiplier and up the voltage to the memory? Cheers Tye In fact, just realised system is only showing 1gb of ram! I don't understand why? OK, 5:8, seems to have nothing to do with poor performance, 1gb of ram was the problem. Have pulled out 2 sticks and now just running 2x1gb. System now detects 2gb of ram at 1066. Have changed no settings. Why does 4x1gb only get detected as 1gb whilst 2x1gb is detected as 2gb? I would love some help to get my memory to run at 1066 again (all 4 sticks).