GA-z68x-UD3H-B3 memory unstable no matter the settings.

[staticx57]

Using factory default settings my system is VERY unstable with constant BSODs. This is 1333Mhz 9-9-9-24 2t. Enabling XMP only my system will not boot past the BIOS. Overvolting to 1.2v QPI and 1.625 vdimm is the most stable setting however this .1625v more on the vdmm and .15 more on the QPI than factory settings. Not to mention this does not guarantee stability. It is simply the most stable setting allowing me to game and run for hours but will crash overnight.

I talked with corsair support that determined most likely the memory is not faulty as it passes memtest86 all together and each stick individually at all settings.

Specs:
Gigabyte ud3h-b3 Motherboard BIOS: F10
Core i5-2500k @ default settings.
Corsair Vengence 4x4GB CMZ16GX3M4A1600C9B
PC Power and Cooling 750 watt
SLI 465 GTX
2xHDD
1xDVD ROM
Windows 7 X64 Pro

[Dark Mantis]

Hi

I know that you have said that it passes the Memtest but have you run it as we would recommend ?

Please follow these instructions exactly.

I would suggest that you download and run the latest version of  Memtest86+ to check your RAM first.

Memtest86+        http://www.memtest.org/

Insert one stick of memory in slot 1 and run Memtest on it for at least 10 complete loops/cycles and if there are no errors then swap it over with the next one and continue untill you have checked all  modules.
 
If you have any errors the module is faulty.

If you have any faulty modules you will have to return the whole kit as they are matched.

Post back when you have done that with the results.

[Lsdmeasap]

System Agent voltage may need to be set to 1.0-1.15 as well, but test as mentioned above first so you are sure the memory is ok!

[Digivolution]

I have the same motherboard and ram. I had the not booting past the Bios BSDO issue only once when i first powered on the system. All I had to do was go into the bios, load Optimized Defaults. And change, 'Advanced Memory Settings', -'System memory multiplier' from Auto to 1600, leave the voltage at 1.5 and everything else alone.

Worked for me. I can confirm the settings on my bios once I get home and look.

[staticx57]

I tested all of my modules to 10+ or errors and one of my modules returned 1 error. This is also puzzling because if I left DRAM V alone memtest would error with "unexpected interrupt" and not run at all. If I set it to 1.6V I can run memtest just fine. I am now testing with the three "good" modules with QPI voltage at 1.2 and DRAM Voltage at 1.6V (as suggested by Corsair).

When I tested with Corsaid the tech suggested DIMM Slot 2, I am not sure if that made any difference.

[Lsdmeasap]

Be sure you are using the latest version of Memtest86+, you can get it here
http://www.memtest.org/#downiso

[staticx57]

You can lock this. Between Corsair and your test methods We determined that one of the RAM modules is faulty. It didnt show with their memtest directions but showed with yours. Perhaps all of the modules are faulty but only the one actually errors while the rest just need more voltage. In either case I imagine that when the modules are RMA'd I can see if the extra voltage is still needed.

[Lsdmeasap]

Nice to see you found the culprit of the issues, sorry to hear you have to RMA though, but at least now you know what the problem was!