Z370 Killer/ac - XMP issues also?

Just noticed there is a new bios that is supposed to improve memory compatability. Unfortunately it seemed to have no effect for solving the issue with my corsair memory.

I am not not memory master like wardog but do know raising voltages can have ripple effect on other parts and in this case it be the ram and memory controller in cpu. If you could get the voltages at 2666 and lock them in and then adjust mem timing you still may be able to hit 3000 or 3200. You will have to experiment with the cas/ras timings, try something like 20-24-24-50 @3000 just to see if it worksNot exactly the same but worth a read: http://forum.asrock.com/forum_posts.asp?TID=7668
update: just checked my voltages and two are running a bit lower than yours but not by much, my VCCSA is about same as yours at 1.210v. Wondering if Intel raised the volts (compared to 7000 series) due to the 6 cores for added stability....


Edited by badbri - 26 Mar 2018 at 1:33am

IMO, a "production' box should NEVER be OC'd. You are correct in that thinking.

That said, your G.Skill F4-2666C15D-16GVR sticks @ 15-15-15-35 prolly can't be beat for the price.

G.Skill does offer some same and lower timings mem at higher freq's for your Z370 Pro4/8700K that don't req OC'ing.
http://www.gskill.com/en/configurator?manu=52&chip=3094&model=3121

.





Edited by wardog - 25 Mar 2018 at 5:53am

steveg wrote: Thanks for your help. Interestingly following your advice I was able to hit 2666. Then I tried 2800 and it worked as well. Anything above 2800 fails or reverts to 2133. Voltages were on auto.

Thanks for the confirmation at 2666.

Hmmmm.......... where to begin here with you................


For starters, I'm an AND FanBoy , so Intel is at times foreign to me. I google too much when here on the Intel side of the forum. That's good, and at the same time, not so.

This time it appears it's good. A few hours practicing my Google Fu here on this turned up a nugget.

Intel i5-8400 CPU Review: 2666MHz & 3200MHz Gaming Benchmarks:
https://www.gamersnexus.net/hwreviews/3086-intel-i5-8400-cpu-review-2666mhz-vs-3200mhz-gaming

And yes. Those v's are steep for the gain. No sense shortening this processors life-span running it at those v's 24/7 daily.

Back to mem, which I know like I was born with 4 sticks in my mouth.

The link above. Not much diff at all between 2666 and 3200 on a locked 8400. Some, yet not a whole lot.

Here's what I'd do here knowing that. Grab AIDA64 and find the sweet spot between voltages and timings. Seeing how low you can get the timings at 2666. That 4000 kit you have uses Samsung e-die IC's which will offer up quite the plethora of options timing wise at 2666. Don't get your head wrapped around a low CAS/CL either. High speed mem behaves very differently when lowering the Mhz than say 2800 mem being OC'd to 3200/3600.

My Sig. That 4133 is Samsung b-die IC's. I can make it pump out comparable latencies using different CL's and if you were to look at the only the resultant generated numbers you wouldn't know that they were using different CL's.

But I wouldn't be comfortable running a VCCIO at that stated 24/7. By the slight gains @ 3200 plotted in graphs of the article above? Nope. No way.


Keep me posted on your progress.




EDIT: that > than

Also.

Both of you.

You DO have the sticks in slots A2 and B2, right?

If not, change them, clear the BIOS and post back. Clear the BIOS after, this is important. Whenever you move mem in and out or swap ALWAYS clear the BIOS. Even if moving the same sticks in and out.