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DDR4 4000 Mhz RAM at 2T command rate only?

g67575

g67575

g67575

Soldato
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30 Jun 2019
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I built a system with a B460M-HDV board, DDR4 4000 Mhz RAM + 10700KF CPU and it's working well so far, just plugged in my SSDs from my last PC and Windows 10 booted with all my files +programs still in tact :)

I set the CPU to turbo to 4.7Ghz all core (increased PL1 to 100w), with the CPU Cache at 4.3Ghz (can't be changed on this motherboard it seems).

Then, I set the RAM to the 4000mhz XMP profile and it seems perfectly stable. I returned to the BIOS later, and noticed that the RAM cannot be set to 1T command rate without crashing (the BIOS then loads the RAM at 2133Mhz). I can only set it to 1T if the frequency is set to 3000Mhz or lower.

Can someone explain the difference between 1T and 2T command rates, and if this setting makes any difference to performance?

AIDA64 tells me that with the RAM set to 4000Mhz 2T, the RAM latency is ~42 nanoseconds, which seems pretty good to me.

I tried the Watch Dogs Legion benchmark and I'm getting > min 60 fps at 4K, with DLSS set to balanced, need to test more settings but it seems to be working very well.
 
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T1 is slightly faster but that said at 4K it will make absolutely no difference so go with T2 if that's stable.
 
I wonder if this is the sort of thing that ASRock could fix with a BIOS update / QVL memory support update?

I went with Patriot Viper Steel DDR4 4000MHZ RAM, which I got even though it's not on the motherboard's RAM QVL list, because it's reasonable value.
 
g67575 said:
I wonder if this is the sort of thing that ASRock could fix with a BIOS update / QVL memory support update?
Click to expand...
No, and it really has nothing to do with ASRock. You can generally forget about running 1T above ~3600 on any DDR4 kit on any motherboard (at least without Ryzen's Gear Down Mode). Some of Asus' super high end boards have a feature called trace centering that will allow it at 4000+, but still, you're not going to notice the difference in real-world performance.
 
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