Upgrade to 980 Ti causing memory instability on RIVE

[Wr1ghtyUK]

I am having a few issues and was wondering if anybody could help...

I have a RIVE with an i7-4960x and 16GB (4 x 4GB kit) Corsair Dominator 2400Mhz, PSU is Corsair AX1200i. I Have been running with the memory on XMP settings (no additional tweaks) and the CPU @ 4.4Ghz for months without issue.

Yesterday I upgraded from dual GTX 680 2GBs to a single GTX 980 Ti 6GB (EVGA SC+) and all seemed well (used DDU to clear old drivers). However, pretty soon after I was getting BSODs and I was unable to go more than 5 or 10 mins without a BSOD (almost every one being a different error message - CACHE_MANAGER, PFN_LIST_CORRUPT, MEMORY_MANAGEMENT, SYSTEM_SERVICE_EXCEPTION, CRITIAL_PROCESS_DIED, etc).

After removing the CPU overlock and winding back the memory to 1866Mhz everything is rock solid (no errors in MemTest86), upping to 2133Mhz gives a few errors but 2400Mhz gives a constant stream of them almost instantly. Ramping the CPU back up and keeping the memory at 1866Mhz was also stable, although the CPU overlock was removed to try and figure this out.

VCORE is already at 1.4v and the memory at 1.65v from the XMP settings - also have Extreme Tweaking and Rampage Tweak Mode 3 set. Working VCCSA up to 1.3v and a VCCSA Current Capacity of 170% made no difference to 2133Mhz, let alone 2400Mhz.

Any idea why changing from 2 x 680 to 1 x 980 Ti has destroyed my ability to maintain a faster memory setting?

Thanks for the help.

[Nate152]

Hello Wr1ghtyUK

Welcome to the ROG forum.

I'm not sure why your ram is giving you trouble after upgrading your gpu but try also raising the VCCIO voltage to 1.20v - 1.25v. It should be color coded, if these voltages put you in the red back it down until it's in the purple.

[Wr1ghtyUK]

Thanks.

Do you mean VCCSA? I can't seem to find VCCIO and VCCSA seems to cover CPU I/O, DMI and PCI-E controller in the description.

I have already had this up to 1.3v with no joy.

[Wr1ghtyUK]

Raising VCCSA up to 1.35v and then 1.4v appeared to make the errors less frequent at 1866hz, but they still occurred (24 errors after about 60secs).

[Wr1ghtyUK]

Right, thanks for your help but it would seem like I have a bad stick of RAM.

The stick in question when installed alone kicked out 64 errors in 60secs on MemTest86.
The other 3 are currently and have been running for 12 mins error free.

This is all running at XMP 2400 without any additional tweaks.

Will run 4 passes then contact Corsair for an RMA, thank you lifetime warranty...

Still baffled as to how this happened, took all electrical and anti-static precautions and although the card comes physically close to the RAM, especially with the water block and back plate attached, they were untouched.

[Nate152]

A bad stick would explain your problem and good job finding it, with a complete working kit you should have no problems. The vccio might be tied to the vccsa if you can't find it in the bios.

Once you get a complete working kit try lowering the vccsa voltage you shouldn't need 1.30v for 16GB of 2400MHz ram.