NEW!!! DRAM Calculator for Ryzen™ 1.6.2 (overclocking DRAM on AM4) + MEMbench 0.8 (DRAM bench) - Page 569 - Overclock.net - An Overclocking Community

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NEW!!! DRAM Calculator for Ryzen™ 1.6.2 (overclocking DRAM on AM4) + MEMbench 0.8 (DRAM bench)

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post #5681 of 5876 (permalink) Old 09-14-2019, 05:34 PM
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Quote: Originally Posted by Synoxia View Post
Jesus christ. I run 3800 c15 and my latency isn't as low as this guy. Could 3900x vs 3700x be worth 3NS whole of latency? I have 65.5 with 3800 c15-16-17-16-30-45... might you share your settings?
He has a dual rank kit, you probably have a single rank kit. Can make a decent difference.

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post #5682 of 5876 (permalink) Old 09-14-2019, 05:50 PM
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Quote: Originally Posted by ComansoRowlett View Post
He has a dual rank kit, you probably have a single rank kit. Can make a decent difference.
Shouldn't 3800 c14 kit be single rank? That has still a latency of 62.7 :/

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post #5683 of 5876 (permalink) Old 09-14-2019, 10:42 PM
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Quote: Originally Posted by Synoxia View Post
Jesus christ. I run 3800 c15 and my latency isn't as low as this guy. Could 3900x vs 3700x be worth 3NS whole of latency? I have 65.5 with 3800 c15-16-17-16-30-45... might you share your settings?
I run 2800 with CL14 and have run it with CL12, but takes more volts, on my RAM, and I used to get 60 NS latency, but even with those timings I've used forever, the only thing I changed was the BIOS, now I'm closer to 90 NS latency. I'm not happy with that at all. Those BIOS updates are effecting first gen Ryzen in a bad way, and I don't think it should be. But I've had the same CPU, Mobo, and RAM since I bought this gear back in 2017. I haven't even installed a new Windows install since then either. Maybe it could be MS with their ****ty updates of late, but I noticed this right after a BIOS update, and it hasn't gotten better with subsequent BIOS updates.
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post #5684 of 5876 (permalink) Old 09-15-2019, 09:15 AM
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Quote: Originally Posted by Synoxia View Post
Jesus christ. I run 3800 c15 and my latency isn't as low as this guy. Could 3900x vs 3700x be worth 3NS whole of latency? I have 65.5 with 3800 c15-16-17-16-30-45... might you share your settings?
I use 3900X + X570 Aorus Elite + PATRIOT Viper Steel 4133 8GBx2 @3733 CL16, but the latency is around 65ns.
Membench (latency test) is affected by the power plan, so you may want to set it to “High Performance”.
https://imgur.com/QY2VLXm.png
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post #5685 of 5876 (permalink) Old 09-15-2019, 09:28 AM
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Quote: Originally Posted by kenny0048 View Post
I use 3900X + X570 Aorus Elite + PATRIOT Viper Steel 4133 8GBx2 @3733 CL16, but the latency is around 65ns.
Membench (latency test) is affected by the power plan, so you may want to set it to “High Performance”.
https://imgur.com/QY2VLXm.png
I unlocked the 'Ultimate Performance' setting, but doesn't seem any different than 'High Performance'. Think I'll run a couple benchmarks and see if there is any difference.

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post #5686 of 5876 (permalink) Old 09-15-2019, 01:25 PM
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Quote: Originally Posted by Synoxia View Post
Shouldn't 3800 c14 kit be single rank? That has still a latency of 62.7 :/
Depends on your secondaries and tertiaries too. They make a huge difference other than just primaries. Zen 2 CPU's tend to cap out at around 63.2ish ns any lower is just a luck of the draw it doesn't matter what kit you have it'll be down to the memory system on the chip. Personally I get 3733 at 63.2 on a single rank kit. Just remember dual rank is just higher performing in general per clock but harder to run, since we're stuck with 1:1 dual rank tends to be the better option with Zen 2.

(Edit: Accidentally said 2:1)

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Last edited by ComansoRowlett; 09-15-2019 at 03:09 PM.
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post #5687 of 5876 (permalink) Old 09-15-2019, 07:54 PM
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Quote: Originally Posted by ComansoRowlett View Post
Depends on your secondaries and tertiaries too. They make a huge difference other than just primaries. Zen 2 CPU's tend to cap out at around 63.2ish ns any lower is just a luck of the draw it doesn't matter what kit you have it'll be down to the memory system on the chip. Personally I get 3733 at 63.2 on a single rank kit. Just remember dual rank is just higher performing in general per clock but harder to run, since we're stuck with 1:1 dual rank tends to be the better option with Zen 2.

(Edit: Accidentally said 2:1)
I see TRFC seems to impact this, GDM impacts it and also SCSLs maybe?.
I tried fiddling with some BCLK oc, seems that latency also depends heavily on clock speed (thus why 3900x/3800x/3600x have better latency than a 3700x/3600)
I've got this. Ryzen master says coupled 1900. Am i actually running fclk at 1926?
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post #5688 of 5876 (permalink) Old 09-15-2019, 08:12 PM
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Quote: Originally Posted by Synoxia View Post
Jesus christ. I run 3800 c15 and my latency isn't as low as this guy. Could 3900x vs 3700x be worth 3NS whole of latency? I have 65.5 with 3800 c15-16-17-16-30-45... might you share your settings?
The latency of 3700x should be lower than 3900x, because just one CCD.
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post #5689 of 5876 (permalink) Old 09-15-2019, 11:20 PM
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Anyone have any pointers on which settings to start dialing back if I find instability? I'm totally new to RAM tweaking. I ran the calculator last night and input the recommended "Safe" settings. Booted fine, seemed stable, ran a pass of the built in memtest tool in the calculator and a few latency and benchmark tests. Ran Firestrike etc. last night even. Then some time this afternoon, like 12 hours later, it apparently blue screened and restarted randomly. I had that the other day but it was a bugcheck with a code no execute memory which is apparently just potentially a driver issue. I'm betting the recent Windows updates are the issue because the system has been running for a month with no issues. Today however with the RAM timing tightening the event log said the memory dump failed so I'm assuming that was an issue with the RAM timings.

I'm guessing I can probably start with some of the more relaxed "Alt" settings suggested by the calc or maybe I should put some of the stuff on the right side of the calculator (cad bus, rtt & procODT, etc) on Auto first to see if that helps? I'm attaching a screenshot of what the calculator recommended. The kit itself is GSkill Trident Z Neo and is a 3600 CL18 kit 2x16GB.
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post #5690 of 5876 (permalink) Old 09-16-2019, 08:30 AM
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Quote: Originally Posted by wesley8 View Post
The latency of 3700x should be lower than 3900x, because just one CCD.
Idk, seems that 3900x is just stronger, has more 3000mbs read and 30000 write bandwith for free...

I can't get this stable... it's just 45mhz over 3800 which i've been running 15-16-17-15-30-45-294TRFC at 1.445 1000% HCI stable, i losened timings and bumped voltage to 1.46, it gave 2 errors at 420% of HCI memtest
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Tryndamere
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