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Corsair vengance 1866 2x4gb running at 1600mhz

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November 25, 2012 10:25:38 PM

Hello,
I just bought a new pc with those components:
Asus p8b75-v,
i5 3750k,
Corsair Vengeance CMZ8GX3M2A1866C9 x2
MSI GTX 660ti PE


The problem is I can't set the RAM at the 1866 frequency. The maximum I can put it is 1600 and by default it's set to 1333. I tried XMP but It fails. Is there any way to set it to the right speed? I checked my motherboard and it's supposed to support this memory.

Thank you in advance.
a c 150 Ĉ ASUS
a c 558 V Motherboard
November 26, 2012 7:39:43 AM

Hi, Corsair doesn't list guaranteed compatible kits for the P8B75-V. I would leave them running at 1600.
April 5, 2013 3:56:56 PM

Having the exact same problem on a different MOBO (M5A99x EVO).
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April 5, 2013 4:44:49 PM

Yes. It's weird checking at my motherboard it says 4 x DIMM, Max. 32GB, DDR3 2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1600/1333/1066 MHz Non-ECC, Un-buffered Memory. I don't know what that (OC) means, overclock? How can I push it to that? When I try my pc won't boot.
April 5, 2013 6:10:09 PM

I think that your RAM timings are off. Are they something like 9-9-9-24? If so, calibrate them to the given timings for your RAM. I know that on Corsair RAM the timings and speed are on a label on the back of each module. The RAM you have is I believe the same as mine so set the timings to 9-10-9-27. Those are the order of the timings that I found. I'm not sure the difference in MOBO BIOS, so I cannot tell you exactly where they are. On mine, the DRAM Timing was under AI Tweaker. About halfway down, there was an arrow with some text saying "DRAM Timing" or something along those lines. Clicked on that, and it brought me to a page with the different timing controls. When mine was at default timings, the sequence was 9-9-9-24. I changed the second to 10 and the last to 27. It worked the second I saved and reset. Hope it helps you, and enjoy your computer!
April 6, 2013 7:17:09 AM

I used the xmp profile and didn't work, also tried to set the timings manually(9-10-9-27) and It didn't work either. :S I don't know what I'm doing wrong.
!