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Memory/DIMM issue with ASUS P9X79 Deluxe

Last response: in Motherboards
July 17, 2012 12:22:55 AM

Asus P9X79 Deluxe
Intel Core i7 3930K
Corsair Memory 16GB(4X4GB) 2*CMZ8GX3M2A1866C9
Corsair H60 Cooler
Seasonic X Series 850 PSU

Updated BIOS to Rev. 1203

I finally solved the MemOK issue last night and got it to POST. All 16Gb was showing up in the BIOS and all DIMM slots where Normal. I ran the board three times all with good readings. Even with the memory set to XMP 1866.

Today I put it all together in the case install windows and now its only reading 12 out of the 16 gigs. I had this similar problem with the first board so I RMAd it. I've heard these boards are picky with certain memory but this makes me want to RAGE quit.

Do DIMM slots go bad so quick? Any suggestions what can be causing this?

Anyone with similar board have any suggestions for better compatible RAM? I'm thinking of getting the Corsair PC1600 32GB(4*8) kit CMZ32GX3M4X1600C10 or the G Skill 32GB(4*8)Kit F3-2133C9Q-32GZH. Anyone using similar kits int theirs?

Thanks in advance for any help.

July 17, 2012 3:04:09 AM

I also ran CPUz and it read 16GBs even though its only showing 12. I'm starting to think that using 2 * 8GB kits is the problem. Can anyone confirm this?


Best solution

a c 716 V Motherboard
a c 207 Ĉ ASUS
a c 347 } Memory
July 17, 2012 3:44:49 AM

So it never occurred to you that the CMZ8GX3M2A1866C9 is a Dual Channel kit and not one of their Quad Channel kits specifically designed, tested and XMP optimized for the X79?!

It's not ASUS and by all appearances poor choices.

Exchange the kit for a Quad Channel kit:
16GB 4x4GB: CMP16GX3M4X1866C9, CMP16GX3M4X1600C7, CMZ16GX3M4X1600C9, or my favorites CMZ16GX3M4X1600C9G.
32GB 4x8GB: CMT32GX3M4X1866C9, CMP32GX3M4X1600C10, CMZ32GX3M4X1600C10, or CMZ32GX3M4X1866C10
Corsair X79 kits -

I run 8x4GB on an ASUS so it's not the DIMM slots -- it's the kit choices; my rig


You can try to manually set the RAM:
AI Overclock Tuner -> Manual ; Auto may work
DRAM Frequency -> DDR3-1866
DRAM Timing Control /Enter
DRAM RAS to CAS -> 10
DRAM RAS ACT -> 27 ; no typo see similar Quad kit -
CPU VCCSA Voltage -> Manual
CPU VCCSA Manual Voltage -> 1.20v ; max safe voltage
DRAM Voltage AB -> 1.55v ; if needed
DRAM Voltage CD -> 1.55v ; if needed
F10 Save & Exit = Yes

Then run Memtest86+ for 4 full passes and stop IF any errors.
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July 17, 2012 3:55:58 AM

Damn It! The little details can get ya.

Will give Newegg a call and get them exchange if still possible.

Thanks for the help.
a c 716 V Motherboard
a c 207 Ĉ ASUS
a c 347 } Memory
July 17, 2012 4:05:19 AM

^ I edited above.
July 17, 2012 4:35:28 AM

Best answer selected by djmenez10.
a c 328 V Motherboard
a b Ĉ ASUS
a c 146 } Memory
July 17, 2012 9:24:38 PM

This topic has been closed by Nikorr