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Old 13th Apr 2012, 14:17   #1
Seb.F
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Corsair Vengeance 1866 won't run at stock speeds (X79 + 3930K)
Hi guys, spec as follows:

X79-UD5
3930K
32GB (8 x 4GB) Corsair Vengeance 1866Mhz
GTX 680
256GB Crucial M4

Basically, was running fine with 4x 4GB sticks on vengeance for the last 3 months, stuck in the other 4, boot looped.

Reset CMOS, left the CPU clock alone and set XMP to 1866, boot loop.

Changed RAM voltage to 1.55V, IMC to 1V, VTT to 1.2V, set XMP back to 1866, still boot loops.

Anything I'm doing wrong here?

Edit: Memtested fine, motherboard can see 32GB on both 1333 and 1600.
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Old 13th Apr 2012, 14:51   #2
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Try upping the VTT a bit more, upto about 1.25V. I'm guessing before adding the additional 4 sticks it worked fine at 1866?
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Old 13th Apr 2012, 14:59   #3
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Yep, was working fine, and each set works just fine at 1866 on its own too. Just when they are combined.
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Old 13th Apr 2012, 15:01   #4
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I'm guessing it's a VTT issue. As mentioned up that a bit more and see if it helps. VTT is for the memory controller and stuff hence me saying up it, just in case you didn't know

Edit: Leave everything else as you had it.
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Last edited by noizdaemon666; 13th Apr 2012 at 15:06.
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Old 13th Apr 2012, 15:01   #5
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which bios are you on? the latest is F10
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Old 13th Apr 2012, 15:23   #6
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Yep I'm on F10

Will try upping the VTT a tad more.
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Old 13th Apr 2012, 18:02   #7
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Still boot loops with a reset CMOS and the only things changed are 1.25V VTT and 1.2V IMC voltages
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Old 13th Apr 2012, 18:09   #8
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I can't get my ram to run at 1866 either, currently running at 1600mhz. (2500K)

Same ram as yourself but I have just 2 x 4gb.

I haven't tinkered with any additional voltages out of laziness really, that and the fact that I read somewhere you don't get much of a boost anyways.

I had a similar issue when I ran AMD and my 1600mhz ddr3 wouldn't run either at stock, had to run at 1333mhz
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Old 13th Apr 2012, 18:13   #9
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That sucks a bit. Ideally I wanted to be running the same speeds as before. I had VTT at 1.05V and IMC at 0.97 before, now it won't even run the 32GB on 1.25/1.2
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Old 13th Apr 2012, 18:14   #10
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Just recall when I was running 4 x 2gb on my old system I had to drop the timings from 1T to 2T or it wouldn't boot.
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Old 13th Apr 2012, 18:16   #11
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I'm going to try and really lay off on the timings and see what that does. I'm trying to run them at stock timings on 1866, perhaps the IMC just isn't up to it.
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Old 16th Apr 2012, 14:13   #12
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there is definitely something amiss in there somewhere, I didn't have to overvolt anything to get my 1866 memory working (X79-UD3 + 3930K), so I suggest you have a faulty bit of hardware in there somewhere - mobo or CPU
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Old 17th Apr 2012, 06:32   #13
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Does it boot when manually set to 1600 or slower?

Work your way through this as well.
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Old 17th Apr 2012, 07:10   #14
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Quote:
Originally Posted by Pookeyhead View Post
Does it boot when manually set to 1600 or slower?

Work your way through this as well.
I agree! Buy a proper X79!
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Old 17th Apr 2012, 08:26   #15
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@OP when you've tried the sets individually, did you try them in both sets of slots? So say you had them in RAM slots 1, 3, 5, 7, did you try 2, 4, 6, 8?
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