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Setting Ram to run at 1600mhz question

post #1 of 3
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I have Corsair XMS 1600mhz ram but CPU-z says it is running at 668mhz so that is 1333 or so I think. Also command rate is 1T not 2 T like some peoples I have seen. With the new Asus bios interface what is the best way to fix this? Do I just go in and select the memory to run 1600mhz in the drop down box or do I need to manually set it up which I am not sure how to do.
post #2 of 3
The best way to do it would be in the BIOS. You'd have to set it to 800 Mhz to get 1600 (as it's dual-channel). Some BIOS give the speed before or after the dual channel, you'll find out when you get in there.

Set the timings to what they're rated (the sticker on the side of each RAM stick will tell you what they need to be) manually rather than leaving them on automatic. Sometimes the BIOS guesses timings wrong. You may need to up the voltage slightly, 0.5v or so above the rated voltage won't do them any harm.
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Project 4
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CPUMotherboardGraphicsRAM
i5 750 Lynnfield @ 4.4 GHz, 1.41v EVGA P55 SLi (132-LF-E655-KR) - A72 BIOS EVGA GeForce GTX 680 4GB G.Skill Ripjaws @ 9-9-9-24, 1.51V 
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80GB Intel X25-M SSD + 500GB WD + 2TB Samsung F3 Samsung Super Writemaster DVD+-R Windows 7 Ultimate Edition Samsung SyncMaster 2433 24" 
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Logitech G15 Corsair TX750 750W Corsair Obsidian 800D + Scythe Kaze Master Ace Razer Deathadder Respawn - Black 
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Steelseries QcK Medium - Black 
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post #3 of 3
Most likely, you will have an XMP profile that you need to select, because 1600 mhz DDR3 is running outside specifications of P67. Selecting the XMP profile will run the memory at the proper settings for full stability at 1600 mhz.

That doesn't mean you are locked at that speed. You can still run 1T, for example, just by going to command rate and manually changing it to 1T, but your mileage may vary on to whether it will work or not. Or you can simply change the ratio to 1600 manually, which will more than likely use the same timings that 1333 mhz did. Likewise, you may even be able to run at 1866, with relaxed timings or with vdimm voltage increase.
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