AMD CPU + G.Skill DDR3-1866

[GSKILL TECH]

CPU NB VID Control is the option to change.

[adostrom]

Still Confused

I've read all the posts in this thread and I'm still confused, and I've been doing this for years...

I have a system I've build with a Sabertooth 990FX R2.0, and a FX-8350. Based on a suggestion from a moderator I upgraded from some Ripjaws sticks to a pair of Sniper F3-1866C9D-16GSR. I am getting all kinds of Memory Management crashes. I am struggling with how to comply with the instruction to "Set CPU-NB Voltage +0.05V to +0.1V depending on stability," everything I try seems to make everything worse. Also, should I be setting Bank Cycle Time (tRC) to 37? Is that what BIOS calls DRAM Row Cycle Time? (Why can't the industry standardize these names?)

I'm attaching some images, thanks in advance for the help!

[adostrom]

ECC Enabled by default on Sabertooth.

I also just figured out that the ASUS Sabertooth 990FX R2.0 enables ECC mode by deafult, and of course the Sniper is non-ECC memory. Could this be causing the crashes?

[emissary42]

CPU-NB is CPU/NB in your bios, so that should be pretty self explanatory. Just apply a small positive offset (+50mV/+100mV) and you are done or if you prefer absolute voltages switch from offset mode to whatever mode your bios offers in addition to that and raise CPU/NB the stated amount above normal.

tRC is indeed (t) time / duration in physics (R)ow (C)ycle, also called Row Cycle Time

Edit: It should not normally result in crashes, the feature would not be used if it is not supported by the memory, but why not manually disable ECC just in case (;

[adostrom]

CPU-NB is CPU/NB in your bios, so that should be pretty self explanatory. Just apply a small positive offset (+50mV/+100mV) and you are done or if you prefer absolute voltages switch from offset mode to whatever mode your bios offers in addition to that and raise CPU/NB the stated amount above normal.

tRC is indeed (t) time / duration in physics (R)ow (C)ycle, also called Row Cycle Time

Edit: It should not normally result in crashes, the feature would not be used if it is not supported by the memory, but why not manually disable ECC just in case (;

OK, I'm not trying to be dense here, but I don't want to fry anything (been there, done that). I think this is really the BIOS screen shot I should have posted. I'm getting the point of raising the NB voltage 100mV, (I also saw somewhere that with 16GB of 1866 memory I should raise the DRAM voltage .05V). So, to do that in this bios I should put .1 into the "CPU/NB Offset Voltage", and set the "DRAM Voltage" to 1.50V.

I will also set the tRC to 37, since the SPD says that's OK. Is 1T really OK for this memory? The SPD says yes, but the web site says it's 2T memory.

Thanks!

[emissary42]

Unless i am mistaken command rate for G.SKILL kits is always 2T in the XMP and this is a common mistake by CPU-Z (since forever). Thaiphoon Burner should report it correctly from my experience.

For CPU/NB i would start with +0.05 if possible and only go up another step if f that does not suffice. To raise Vdimm by +50mV above default you would have to set it to 1.55V, that can help with boards that have a weak memory voltage regulation.

[adostrom]

Thanks!

Yes, of course 1.55V for the DRAM, that that was a brain fart. Good so far -- I'll see if I can go a few hours without a crash, that will be the challenge!

Thanks for all the help and patience!

[felix_w]

As a loyal G.Skill owner/user, i'll just leave this here...



voltages are not optimized, i ran 2 more different presets with lower voltages.

Custom watercooling with Phobya 1080 (9x 120mm fans)

Long live Thuban X6 ! Long Live GSkill TridentX !