Hi. When I was buying this kit I expected it would be Karhu 10h+ stable on at least 4000 16-16-16-36 1.38V. XMP suggests that after all.
This is what I actually get:
4000 16-16-16-34 - 1.39V - error after 6min, 1.40V - error after 4h
I didn't have trouble with XMP stability with no other G.Skill or any other kit so far. In fact, every kit had at least 0.05V headroom on XMP speed. Apart from F4-4000C15D-16GVK 4000 15-16-16-36 1.50V, that one needed 1.47V
Maybe it's only Karhu that is not stable, Prime95 will for sure be on 1.40V and I will also try TestMem5.
Motherboard is on QVL list: MSI MPG Z590 GAMING CARBON WIFI
Karhu 24h+ stable settings:
3600 14-15-15-32 - 1.36V
3600 14-14-14-30 - 1.41V
3700 14-20-20-40 - no boot, this kit is not suited for AMD
3700 15-20-20-40 - no boot
4000 16-16-16-34 - 1.41V
4200 16-16-16-34 - 1.48V
4266 16-16-16-34 - 1.52V
4400 17-17-17-36 - 1.49V
4533 18-18-18-38 - not stable, will also try 18-20-20 and 19-21-21
This is what I got on F4-3600C14D-32GTRG 3600 14-15-15-35 1.45V:
3600 14-15-15-32 - 1.37V
3600 14-14-14-30 - 1.39V
3700 15-15-15-32 - no boot
3800 14-15-15-35 - 1.45V
4000 14-16-16-32 - 1.52V
4000 16-16-16-34 - 1.43V
4133 16-16-16-34 - 1.48V
4200 16-16-16-34 - 1.50V
4266 16-16-16-34 - not stable
4400 17-17-17-36 - 1.52V
4533 18-18-18-38 - 1.51V
So as you can see 4000 is better for 16-16-16 and 17-17-17 OC and 3600 for 14-15-15 and 18-18-18 OC. XMPs suggest that and I am fine with that.
It's fine actually, I will just use the whole 64GB when the time is right. Next time I will keep away from these "top" kits as they are not worth the money (around 360€ vs. 260€ for 2x16GB), except for extreme overclockers. I lately found posts of 3200 14-14-14, 3600 16-16-16 and 4000 17-18-18 kits and they all do 4400 17-17-17 or at least 17-18-18. I wouldn't be surprised if 4000 19-19-19 also does it. And most people would be happy with 4400.
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