Latency question - possible issue?

Daniel_ · 27 Jan 2022 at 10:02

Hi all.
Ive recently replaced 64Gb (4 x 16) of corsair vengeance pro 3600 18-22-22-42 with 32Gb(4 x 8) of Team group ripped edition 3600 14-15-15-35.

Whilst benchmarking with Passmark Performance test, the latency result of the Corsair is 26 (95th percentile) whereas the latency of the Team group is 41 (50th percentile)
Both had DOCP on and a mild CPU overclock.

Am i totally missing something here? Surely the latency should be lower not higher? Any ideas?

Ryzen 9 5950x CPU
Ausu x570 F MB

Thanks
Dan.

Quartz · 27 Jan 2022 at 10:12

What is the speed of the RAM? What is the FCLK?

Daniel_ · 27 Jan 2022 at 10:22

3600mhz and FCLK 1800. Ive tried tweaking it to 3666 and 1833 but there's no change.

I've also brought the tFRC down from 630 to 300 which helped a little

Quartz · 27 Jan 2022 at 10:31

Daniel_ said:
3600mhz and FCLK 1800. Ive tried tweaking it to 3666 and 1833 but there's no change.

Try decreasing those figures to 3200 and 1600 respectively.

mickyflinn · 27 Jan 2022 at 10:35

Daniel_ said:
3600mhz and FCLK 1800. Ive tried tweaking it to 3666 and 1833 but there's no change.

I've also brought the tFRC down from 630 to 300 which helped a little

What's the command rate ?

Daniel_ · 27 Jan 2022 at 11:03

Try decreasing those figures to 3200 and 1600 respectively.

Ok thanks, i'll try that when i get back from work this afternoon.

What's the command rate ?

Im not entirely sure as im not at the pc right now, but i think its 2T. Would it be worth changing that?

PS, Im new to memory tweaking/overclocking :confused:

mickyflinn · 27 Jan 2022 at 11:24

Daniel_ said:
Ok thanks, i'll try that when i get back from work this afternoon.

Im not entirely sure as im not at the pc right now, but i think its 2T. Would it be worth changing that?

PS, Im new to memory tweaking/overclocking

Me too

Yes

Google 1t v 2t wil give you a better explanation.

Daniel_ · 27 Jan 2022 at 16:17

Ok.
Decreased the speed to 3200/1600, no change.
Changed command rate from 2T to 1T, no change.
Reset DOCP to auto, no change.
Reset bios and overclock, no change.
Tested each module in each slot, no change.

Im now thinking it could be a compatibility issue with the motherboard?

Ayahuasca · 27 Jan 2022 at 16:37

Have you tried measuring latency in a different tool such as Aida64? The timings can't be applying if it's staying the same. Dropping to 1T alone would make a difference.

Daniel_ · 27 Jan 2022 at 18:06

Ayahuasca said:
Have you tried measuring latency in a different tool such as Aida64? The timings can't be applying if it's staying the same. Dropping to 1T alone would make a difference.

I have, both Aida64 and Hwinfo, they both show the same 14-15-15-35

Daniel_ · 28 Jan 2022 at 13:36

Thank you all for your help. I think im going to have to return them, as nothing ive triied has helped.

Guest2 · 29 Jan 2022 at 14:02

Daniel_ said:
Hi all.
Ive recently replaced 64Gb (4 x 16) of corsair vengeance pro 3600 18-22-22-42 with 32Gb(4 x 8) of Team group ripped edition 3600 14-15-15-35.

Whilst benchmarking with Passmark Performance test, the latency result of the Corsair is 26 (95th percentile) whereas the latency of the Team group is 41 (50th percentile)
Both had DOCP on and a mild CPU overclock.

Am i totally missing something here? Surely the latency should be lower not higher? Any ideas?

Ryzen 9 5950x CPU
Ausu x570 F MB

Thanks
Dan.

I get '36' latency on Performance Test 10.2. This with Teamgroup 3600 C16 running 3800 C14 tight timings so seems about right.
This Performance test software seems rather garbage so its getting uninstalled now. It almost feels like software that has built in Malware from ~2000

Run AIDA64 and Zentimings to get timings. These are mine in AIDA64. It will show in AIDA64 (at the bottom of the cache and memory benchmark)

What is your BIOS version / AGESA version?

Does setting XMP in BIOS allow Windows to boot and run a default membench on DRAM-Calculator-for-Ryzen? If not then I would certainly return it.

Daniel_ · 29 Jan 2022 at 17:25

Latest bios verson - 4021, not sure on the AGESA. I can only get windows to boot if it has four sticks. It wont boot with only two, regardless of DOCP on or off.

Aida64 and Zen timings below

https://imgur.com/a/lT6Ljwj

Ill try Membench asap.

Thanks.

Guest2 · 29 Jan 2022 at 22:44

Daniel_ said:
Latest bios verson - 4021, not sure on the AGESA. I can only get windows to boot if it has four sticks. It wont boot with only two, regardless of DOCP on or off.

Aida64 and Zen timings below

https://imgur.com/a/lT6Ljwj

Ill try Membench asap.

Thanks.

Have you tried running XMP, that doesnt look like XMP for 3600 14-15-15-35 as its running 3733Mhz / 1867 IF. Unless that's what four sticks does
Latency looks a bit high for C14 so possibly gear down mode is kicking in. Try running it at rated XMP specs (3600 / 1800 IF) with GDM disabled

.Lethal · 2 Feb 2022 at 17:37

Daniel_ said:
Im now thinking it could be a compatibility issue with the motherboard?

If it's a new board and you haven't updated the BIOS it's almost always this. This was the problem for me just a few weeks ago.

It's one of the first things I usually do on a new build.