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Overclocking failure on 1600mhz

Last response: in Overclocking
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February 16, 2011 11:04:52 PM

I had a stable 3.5ghz/1.21v overclock on 1333mhz ram running at 1.5v.

I decided I wanted to higher and bought some 1600mhz ram rated at 1.65v.

Every time I run Prime95 pretty much on any settings I get failures. Memory dump after memory dump. I set the dram voltage to 1.64v. I set the timings to 8-8-8-24 just like the Corsair Dominator is rated for and I don't even run it at 1600mhz. I run it anywhere between 1400 and 1550 and no matter what I set the vcore at I get failure. Hell, even if I set it to 1.21v and try for 3.5ghz on the Dominator it fails. What am I doing wrong with this RAM?

Any suggestions?

a b à CPUs
a b K Overclocking
February 16, 2011 11:21:42 PM


Do you use auto setting for QPI/DRAM? if so, you might want to manually dial it in for a stable OC.
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a b à CPUs
February 16, 2011 11:21:48 PM

What CPU? Which motherboard? How many sticks of ram? Which ram model #?
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Related resources
February 17, 2011 12:04:23 AM

Core i7 920 2.67 D0 Stepping
CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMP6GX3M3A1600C8
Evga x58 SLI LE
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February 17, 2011 12:06:43 AM

Yes I use auto for QPI/DRAM. All I was changing was the following settings. This is what I did for the 1333mhz valueram and it worked great.

Changing vcore
Changing dram voltage to setting for my specific memory to 1.64v
Changing memory timings to 8-8-8-24 as specified for my ram
Changing BCLK
Changing ratio to 2:8
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a c 138 à CPUs
a c 241 K Overclocking
February 17, 2011 3:41:45 AM

loosen the RAM timings to 9-9-9-25, it will make the ram more stable resistance, if the ram is stable settings( under test stabillity) re-tighten your RAM timings 8-9-9-24 test again .....again , until you get the most stable settings for the system
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a b à CPUs
a b K Overclocking
February 17, 2011 2:04:11 PM


Both motherboard and memory should support XMP profiles, so enable that in BIOS, and adjust frequency to your preferred level (XMP profiles tells the motherboard the settings for QPI/DRAM, DRAM voltage and latencies).
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February 17, 2011 2:11:29 PM

So basically I just choose XMP profile and then the only thing I would adjust is the ratio to bring down the Mhz to at or under 1600 as I adjust my base clock?

I would really only change my base clock, vcore, and memory ratio then for my oc correct?
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a b à CPUs
a b K Overclocking
February 17, 2011 7:22:40 PM


Depending on how much of an overclock you are going for, yes.

You might also have to up CPU PLL and CPU VTT slightly.
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