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Post by Deleted on Mar 7, 2021 0:13:17 GMT -5
Any ideas how I can get my latency down ? I have tried stupid speed (4800) and now stupid timings and this is as low as I can go . Must be doing something wrong .  |
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Post by ShrimpBrime on Mar 8, 2021 19:52:06 GMT -5
Hey I helped you start a new thread!! (Wanted to put this not in Scotty's thread) So with my 2700X, I started low and slow. IF is locked to 1:1, cannot be changed. This example is 3733mhz with a better latency than yours. It was simple. I ran Windows 7 instead of Windows 10. No hardware tricks here. Even super loose timings for the clocks eh??  |
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Post by freeagent on Mar 8, 2021 20:37:04 GMT -5
That's pretty good man.. I couldn't do that with my XT.. not sure why. I should try 7, Its been a few years..
You would cringe if I told you how I set my subs.. this board is weird.
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Post by ShrimpBrime on Mar 8, 2021 20:43:19 GMT -5
That's pretty good man.. I couldn't do that with my XT.. not sure why. I should try 7, Its been a few years.. You would cringe if I told you how I set my subs.. this board is weird. Work with whatcha got. That's how I roll. Was doing 2.0v + on 4+1 VRM M5A78 760G chipset running 7ghz overclocks. Was told it couldn't be done. At OCF actually. I set out and got 2 of the same board and OCed the shit out of many processors on LN2. Anyhow, W7 on Cpu benchmarks. I use W7 starter (lately 32 bit) but was setup for sA. I hot swapped to 1366 with it XD. You guys didn't notice that in the thread I made haha. |
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Post by alpi on Mar 9, 2021 2:43:59 GMT -5
At very first, You should know the "basics". How Your cpu works and what is that You should follow or prefer when You want lower mem latency. There are 3 freqs what You have to focus and control ! Fclk, mclk and uclk. Both are important ! An article what I've found fast. You can find better ones maybe.  Next step, You should find better monitoring stuffs because Cpuz, Aida, e.g. not showing all the information what You need. (I prefer Zentimings because it's very informative and smart. Shows everything what You need and nothing what You don't.)  (donate if You can and if You like. The developer is a legend and a forum member also.   ) Latency wise, the best setup is the 1:1:1 (fclk:uclk:mclk), synced one ! Clearly this is what gives You the lowest mem latency. Not just with Your Zen3 but with Zen2 cpus even ! (actually it's the best with earlier Zen and Zen+ models too but those are "locked" to this setup so Your fclk will determine the others too.) Have fun ! Ps. : There was a Zen Spi32 challenge on Hwbot a bit earlier. Spi32 is about mem latency ! Fortunatelly Zentimings window was also needed so You can check how the others tweaked their system ! Pretty nice bunch of infos. |
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Post by Deleted on Mar 9, 2021 3:51:58 GMT -5
No idea what you are talking about so I will just carry on doing what I am doing and enjoy myself.
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Post by alpi on Mar 9, 2021 4:08:44 GMT -5
Just wanted to point, You are in assync setup and that's why Your latency a bit higher. Don't know Your fclk but Your uclk : mclk isn't 1:1.  |
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Post by Deleted on Mar 9, 2021 4:46:09 GMT -5
How do I get it lower ?
Please explain in laymans terms .
I am running an Asus
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Post by alpi on Mar 9, 2021 6:03:51 GMT -5
How do I get it lower ? Please explain in laymans terms . I am running an Asus Try to find a setting that has only 2 option ! 1:1 and 1:2. uclk and mclk only can be this 2. Synced or halved. Fclk is what can be assync from these two. Maybe it's on Your Amd Overclocking submenu. If it's on auto it's turned down over a point to halved, You should fix it manually to 1:1. The halved 1:2 setting is important for high mem clock setups. When You want some high mem freqs, that is what You have to use. But synced setup is good if You keep all the three fclk:mclk:uclk (1:1:1) synced. That is how You can get the lower latency and this is what gives You improvements is a few situtation. If anything is unsynced You loose Your possible gain. (at least a big percent) |
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Post by freeagent on Mar 9, 2021 8:58:24 GMT -5
Make fclk and mclk match up.. Attachments:
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Post by ShrimpBrime on Mar 9, 2021 11:52:01 GMT -5
How do I get it lower ? Please explain in laymans terms . I am running an Asus Try to find a setting that has only 2 option ! 1:1 and 1:2. uclk and mclk only can be this 2. Synced or halved. Fclk is what can be assync from these two. Maybe it's on Your Amd Overclocking submenu. If it's on auto it's turned down over a point to halved, You should fix it manually to 1:1. The halved 1:2 setting is important for high mem clock setups. When You want some high mem freqs, that is what You have to use. But synced setup is good if You keep all the three fclk:mclk:uclk (1:1:1) synced. That is how You can get the lower latency and this is what gives You improvements is a few situtation. If anything is unsynced You loose Your possible gain. (at least a big percent) I think the 1:1:1 ratios work best with chips that have multiple CCX. Please describe this for daily clocks or for max memory benchmarking, which I think Spit is after pure bandwidth with low latency. CL 14 4600mhz makes up for that unlink IF ratio 1:2 and thats dandy for benchmarking. |
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Post by Vinster on Mar 9, 2021 16:37:47 GMT -5
Have a look at this thread. when I started my latency was at 70ns... after some tuning I got it down to 55ns. sometimes I get 53ns... warp9-systems.proboards.com/thread/1407/wifewillcutmynutzoff-third-memory-tuningOne thing I realized and I'm sure it's either CPU or memory dependent, running to high a frequency reduced my latency. my RAM is rated for 4400mhz, but I get the "best" performance at 3866mhz. Overall, if you're near 60ns from what I can see you're not in a bad place. higher than 65ns you should lighten the timings or increase the memory freq.
for seeing your memory, like alpi noted ZenTimings works, I was using HWInfo as I had it installed anyway to port sensors to MSI AB.
Vin |
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Post by Vinster on Mar 9, 2021 16:44:55 GMT -5
Also, on my Asus C8H, to also set mclk and uclk, I had to do that in the AMD overclocking menu at the bottom of the CPU section. scroll down and you have to "agree" to enter that section. then you have to dig around in there. another thing I noticed, after a cmos reset, if I set my fclk but then increased my FSB, my system automatically went to a 1:2 if uclk and mclk were left on Auto in the OC menu.
Split, I'm like you on a lot of this memory stuff. I know the basics fro DDR/DDR2 that I carried a bit in to DDR3 but didn't really touch that iceberg as the number of setting grew a lot... DDR4 is a whole new level.
Vin |
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Post by ShrimpBrime on Mar 9, 2021 16:49:09 GMT -5
Also, on my Asus C8H, to also set mclk and uclk, I had to do that in the AMD overclocking menu at the bottom of the CPU section. scroll down and you have to "agree" to enter that section. then you have to dig around in there. another thing I noticed, after a cmos reset, if I set my fclk but then increased my FSB, my system automatically went to a 1:2 if uclk and mclk were left on Auto in the OC menu.
Split, I'm like you on a lot of this memory stuff. I know the basics fro DDR/DDR2 that I carried a bit in to DDR3 but didn't really touch that iceberg as the number of setting grew a lot... DDR4 is a whole new level.
Vin You have this set up for daily clocks then? What's your daily clocks at Vin? |
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Post by Vinster on Mar 9, 2021 17:08:37 GMT -5
I had no issues at 4.8ghz with the last screenshot from that thread. that PC has been off for about a month as I'm still on my 1700x rig waiting on my GPU... I ran that at those settings for benching my GTX690 and other bits and had zero issues for the 3 months I used that rig. I think this week I'm going to re-fire up my 5800x rig and go to that until my GPU and WB comes in. I need to re-install Windows 10...
Vin
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Post by ShrimpBrime on Mar 9, 2021 17:17:53 GMT -5
AH right, I pulled the pic from the thread so we can see it here if that's ok. 1:1:1 ratio 1900mhz CL 16 with 58ns latency.  |
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Post by alpi on Mar 9, 2021 18:06:01 GMT -5
Theoretically there should be a point where assync reaching the synced latency it's sure. Unfortunatelly I haven't got mems what can do such strong high clock setups.  I talked with Dancop when this Am4 spi32 compo was and He told, couldn't beat synced results with assync. Weren't too far but was slower. Benchmarks, like GB3 for example works insane with setups, what You mentioned earlier. 4600 c14 and so. Mem score is scaling to bandwith what boosts your overalls ofc. It's far the best setup to there. |
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Post by freeagent on Mar 9, 2021 18:17:46 GMT -5
I tried a little experiment earlier by running FCLK at 1933 and mems at 4400 16-16-16 and the latency was 60.1ns. Then I set my sticks to stock 3200 14-14-14 and got 59.8. Not so bad on Zen3 but on my xt those mems at 4400 16s with fclk at 1900 would have been in the low 70s.
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Post by Deleted on Mar 9, 2021 19:38:31 GMT -5
Thanks guys
Just what I needed .
A lot of good reading just posted in this thread .
You guys are all stars , thanks
Paul
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Post by ShrimpBrime on Mar 9, 2021 19:39:07 GMT -5
I tried a little experiment earlier by running FCLK at 1933 and mems at 4400 16-16-16 and the latency was 60.1ns. Then I set my sticks to stock 3200 14-14-14 and got 59.8. Not so bad on Zen3 but on my xt those mems at 4400 16s with fclk at 1900 would have been in the low 70s. That's good. I wish for screen shots! |
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Post by ShrimpBrime on Mar 9, 2021 19:44:00 GMT -5
Theoretically there should be a point where assync reaching the synced latency it's sure. Unfortunatelly I haven't got mems what can do such strong high clock setups. I talked with Dancop when this Am4 spi32 compo was and He told, couldn't beat synced results with assync. Weren't too far but was slower. Benchmarks, like GB3 for example works insane with setups, what You mentioned earlier. 4600 c14 and so. Mem score is scaling to bandwith what boosts your overalls ofc. It's far the best setup to there. Right so running 4600mhz on any of my systems is impossible. So the focus is to just lower the latency at any frequency, doesn't have to be at 4600mhz or even 4000mhz. It's a doable thing 60ns or less. Can lean on Cpu frequency to lower latency as well. The CPU overclock backs the Memory bandwidth. |
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Post by freeagent on Mar 9, 2021 20:34:57 GMT -5
I tried a little experiment earlier by running FCLK at 1933 and mems at 4400 16-16-16 and the latency was 60.1ns. Then I set my sticks to stock 3200 14-14-14 and got 59.8. Not so bad on Zen3 but on my xt those mems at 4400 16s with fclk at 1900 would have been in the low 70s. That's good. I wish for screen shots! As requested   |
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Post by Deleted on Mar 9, 2021 20:45:26 GMT -5
Hey ShrimpBrine , don't know if I thanked you for starting this thread for me but a very big thank you from me , thanks bud .
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Post by ShrimpBrime on Mar 9, 2021 21:58:23 GMT -5
Of course Paul. Fun results here so far.
Trying to get my Ryzen Athlon going 4.3ghz. Its a battle lol. Stupid SMT is only good for 4.2ghz...
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Post by freeagent on Mar 9, 2021 22:21:21 GMT -5
Ehh.. 1 small thing.. The C14 result is dual rank.. C16 with 2 sticks. Best I could do with 4 sticks on this CPU is 1900/1900. No chance of getting all 4 to run fast without throwing all the other timings into the blender. Almost no point in running fast with things so sloppy on the secondary side. And even then its no guarantee.. I think it might be the board but it could be the operator too. But who runs 4 sticks anyways.. I run these settings up to 1900/1900  |
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Post by ShrimpBrime on Mar 9, 2021 23:08:34 GMT -5
Ehh.. 1 small thing.. The C14 result is dual rank.. C16 with 2 sticks. Best I could do with 4 sticks on this CPU is 1900/1900. No chance of getting all 4 to run fast without throwing all the other timings into the blender. Almost no point in running fast with things so sloppy on the secondary side. And even then its no guarantee.. I think it might be the board but it could be the operator too. But who runs 4 sticks anyways.. I run these settings up to 1900/1900 View AttachmentI dunno. My best board only has 2 slots so........ *shrugs* rog.asus.com/us/motherboards/rog-strix/rog-strix-b450-i-gaming-model/lol. |
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Post by freeagent on Mar 9, 2021 23:13:36 GMT -5
Its an OCD thing, hard to explain.. 2 is fun, 4 is a bit of a challenge.. it would be better if they were matching bins though..
Your board is sweet man, if it was new and wasn't yours I would rub it on myself a little if no one was around.
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Post by ShrimpBrime on Mar 9, 2021 23:25:53 GMT -5
Its an OCD thing, hard to explain.. 2 is fun, 4 is a bit of a challenge.. it would be better if they were matching bins though.. Your board is sweet man, if it was new and wasn't yours I would rub it on myself a little if no one was around. Well the Cpu socket is pre-lubed with Vaseline, are you sure you don't want to borrow it?? |
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Post by ShrimpBrime on Mar 9, 2021 23:29:23 GMT -5
Intel 8700K 4.7ghz 1866mhz mem - latency = 49.5
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Post by freeagent on Mar 9, 2021 23:31:46 GMT -5
Its an OCD thing, hard to explain.. 2 is fun, 4 is a bit of a challenge.. it would be better if they were matching bins though.. Your board is sweet man, if it was new and wasn't yours I would rub it on myself a little if no one was around. Well the Cpu socket is pre-lubed with Vaseline, are you sure you don't want to borrow it?? I mean if your offereing.. I would do the same for you, except I would just pack a bottle with it.. crazy days and all  And of course, some moist towelettes.. |
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