I just built a computer yesterday and my RAM readings are 1066mhz. The RAM I have is 1600mhz.
I understand I need to set the speed in BIOS after changing the timings (which is 8-8-8-21), voltage (which is 1.6V-1.65V) and then increase the speed to 1600mhz.
Can someone tell me how and where to change these specifications or point me to some instructions that may be online somewhere.
I have never tinkered with anything in the bios with hardware and thought I would try to utilize my RAM's full potential of 1600.
I'm assuming you haven't overclocked at all. After entering the BIOS, go to memory features, or something similar, and change these timings:
CL - 8
tRCD - 8
tRP - 8
tRAS - 21
CR - 2T (should be at 2T, doubt it could be set at 1T)
Change vDIMM/DRAM/memory voltage to 1.6V or lower preferably.
Considering you're not overclocking, set your FSB : DRAM ratio to 2:12. If you don't have FSB : DRAM option, then you'll probably have a 'memory mulitplier' option. If so, set that to 12x, and voila, you're at 1600MHz.
Mind you, the performance difference between 1066MHz and 2000MHz isn't really noticeable apart from benchmarks.
Well, I wasn't planning on overclocking. I've never tried overclocking before, I've always built stock machines.
If I knew the PC-12,800 i bought would only produce 1066, i would of bought PC-10600 and save money.
Do you know why my 1600 ram is only operating at 1066? The mobo specs read 2000 for OC but not 1600 and under.
btw - I have a i7 930 so no FSB.
When I check CPU-Z I have 8-8-8-22 CR 2T, 1.5V
So by just changing the memory multiplier to 12X will this work?
The reason why it says 2000 (O.C) is because you'd have to overclock your CPU to get that specific speed.
As for buying 1066MHz memory - it's relatively rare and 1600MHz is more common, and allows you to overclock your CPU without your RAM being the limit.
By default, I'm pretty sure that DDR3 RAM runs at 1066MHz in X58 systems, not sure about LGA 775/1156. As for you not having FSB - I know it's BCLK, but it is still considered as FSB, as it has the same idea (FSB x Multiplier = CPU speed, BCLK x Multiplier = CPU speed as well). Changing it to 12x would work.
If you change the DRAM frequency to 1600MHz, it should work, although I'm not sure if ASUS automatically sets their own timings with it's automatic 1600MHz DRAM setting. Best that you just set the memory multiplier to 12x.
Okay thanks. I have one more question. On my i7 930 I only have the stocked CPU fan and heatsink so I don't want to risk OC my processor with possibility of overheating.
Will it be safe and will it not effect the CPU by changing memory multiplier to 12X?
Well, increasing the memory voltage may very very very very slightly increase CPU temps, as the memory controller which handles the memory is located on the CPU, but I doubt it. Anyway, increasing the RAM speed will only mainly affect your RAM temperature, but those G.Skill PI series have pretty awesome heatsinks and should keep them cool.