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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 190

post #1891 of 5776
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Quote:
Originally Posted by lilchronic View Post

lilchronic--i75820K @4.7/4.5---3200Mhz-C13-13-13-30-1T----1.45v---SA 1.06v---Stressapptest----2 Hour


Ace CPU, that smile.gif
post #1892 of 5776
I managed to get my 5930k to cooperate with 14-15-14-34 3333MHz RAM (4x8GiB) on a 125MHz strap (stock is 3200MHz RAM), but had to lower my cache frequency from 4.3GHz to 4.0GHz as my temperatures were already at 80c during stress testing so I couldn't raise cache voltage further (the hazards of air cooling). Should I use AIDA64 to benchmark the two settings to see which is better, or should I use gaming benchmarks since that is my main use of the computer?
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post #1893 of 5776
Quote:
Originally Posted by stargate125645 View Post

or should I use gaming benchmarks since that is my main use of the computer?

AIDA64 greatly benefits from cache clock, however it is synthetic. Most gaming benchmarks seem to cap off at 2400MHz, with the next big improvement being 3200MHz. Best way to test is to max out FPS at as low a resolution as possible to force greater CPU load. Or you could just run 7-Zip's benchmark (which I find much better and repeatable). At the end of the day, it's really a matter of personal preference. Battlefield might be a good game to test out performance with.

Cache voltage is fine up to 1.20V, even at 80C (package I assume? even 80C Core Max is safe for stress testing). Cache clock can affect RAM stability at higher clocks however.
Edited by Desolutional - 7/10/16 at 2:30pm
post #1894 of 5776
Quote:
Originally Posted by Silent Scone View Post

Ace CPU, that smile.gif
Thanks
Finally gave these sticks the voltage they needed. Checked with a DMM and actual voltage is 1.474v just like what aida64 is reading.
post #1895 of 5776
Quote:
Originally Posted by lilchronic View Post

lilchronic--i75820K @4.7/4.5---3200Mhz-C13-13-13-30-1T----1.45v---SA 1.06v---Stressapptest----2 Hour

Similar voltage to what my 3200 ram are running at only a little higher SA since I have broad well.
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post #1896 of 5776
Quote:
Originally Posted by Desolutional View Post

Quote:
Originally Posted by stargate125645 View Post

or should I use gaming benchmarks since that is my main use of the computer?

AIDA64 greatly benefits from cache clock, however it is synthetic. Most gaming benchmarks seem to cap off at 2400MHz, with the next big improvement being 3200MHz. Best way to test is to max out FPS at as low a resolution as possible to force greater CPU load. Or you could just run 7-Zip's benchmark (which I find much better and repeatable). At the end of the day, it's really a matter of personal preference. Battlefield might be a good game to test out performance with.

Cache voltage is fine up to 1.20V, even at 80C (package I assume? even 80C Core Max is safe for stress testing). Cache clock can affect RAM stability at higher clocks however.
This is core temperature I am referring to (I use CoreTemp to monitor), which I believe is the same thing as package temperature? I realize even up to 100C for core temperature is still within spec technically, but I like to keep 80C for maximum in general. Technically I have peaks in the low-mid 80s briefly for one core at a time, but generally the core temperatures stay in the high 70s so I'm OK with it. My cache voltage is 1.18V for both 4.3GHz cache/3200MHz RAM and 4.0GHz cache/3333MHz RAM. I was able to have a higher cache during winter when ambient temperatures were lower. 1.23V is needed for 4.625GHz core, for what it's worth. I haven't changed VCCSA from stock value so I couldn't even tell you what it is offhand.
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post #1897 of 5776
Quote:
Originally Posted by greg1184 View Post

Similar voltage to what my 3200 ram are running at only a little higher SA since I have broad well.

Got a screen shot of what timing's you are running?

last time i tried 3200Mhz cl13 i only went up to 1.420v because i like that number biggrin.gif passed gsat for 1 hour but in HCI i got a error @ 650%

Honestly i dont think im even going to try hci this time as i couldent get gsat stable for 2 hours until i made it up to 1.45vdimm, i think that should be enough.
post #1898 of 5776
I think, I have it. HCI Memtest @ 1400%. I'll consider this as stable.

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post #1899 of 5776
Quote:
Originally Posted by Blameless View Post

Since the limit on tREFI seems to be reasonably low on my board I'd figure I'd see if I can completely stabilize 30000 cycles and have been refining my testing procedure a bit.

Currently, I start with a random mix of cold and warm reboots (about two dozen of them) to look for training errors, then I move to 2-3 hours of GSAT, finally I run Memtest86's bit fade (fills the memory, lets it sit for 90 minutes, then reads it) and and row hammer (not very effective on DDR4 setups, but it's still demanding enough to find some errors if refresh intervals are too long or refresh time too short) tests back to back for 5-10 loops.

Anyway, been messing with my uncore and VLs again, very conservatively. Soon I should crack 65GB/s read at sub-50ns latency at DDR-2667, probably with 24/7 stability and safe volts:

Lol, we have identical clocks (4.3 Core, 4.0 Cache). My timings are 14-12-11-36 CR1. Doubling tREFI earns me a 5ns reduction in latency. My only question is, what is the relationship between tREFI and DRAM Clock?
Just a quick test, not even closed background apps or stopped my music. (Click to show)
post #1900 of 5776
Quote:
Originally Posted by Desolutional View Post

Lol, we have identical clocks (4.3 Core, 4.0 Cache). My timings are 14-12-11-36 CR1.

Looks like your extra ranks/interleaving are giving a bandwidth advantage.

What are your secondary and tertiary timings?
Quote:
Originally Posted by Desolutional View Post

Doubling tREFI earns me a 5ns reduction in latency.

That's a much more substantial reduction than I see, but your denser ICs likely require a higher tREF which gives TREFI more impact.
Quote:
Originally Posted by Desolutional View Post

My only question is, what is the relationship between tREFI and DRAM Clock?

Refresh interval is normally specified in microseconds (7.8us is standard), so the higher you clock the memory the more cycles in that time frame.

At 2667MT/s (1333.3MHz actual clock) 7.8us is ~10400 cycles, the 30000 cycles I'm testing is a bit over 22us.
Edited by Blameless - 7/11/16 at 6:31am
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