Time Spy Memory scaling- Single v. Dual rank

[Midnight703]

I did some experimenting with single rank v. dual rank memory in Time Spy and thought I would share my results here.

Setup:

10900k at 5.3 core/4.7 ring

XII Apex

Single rank kit- Team Group 8-pack 4500cl18 xtreems

Dual rank kit- G. Skill Trident Z 32gb 3200 cl14

Testing methodology:

I used Time Spy cpu run only to compare results, and used the cpu score to measure gain in performance for each timing. I used maxmem to reduce the 16gb down to 5gb, and from 32gb to 10.4gb. For memory timings I used flat primaries with tRAS=tCL+rRCD(RD)+2, tWL= CL-2, tRDRD_dg and tWRWR_dg at 4, maximus tweak mode 2, and used 1t for all of the single rank timings, but for dual rank 1t only worked on the first test, and 2t was used at the rest of the timings. Everything else on the memory was kept at auto, I have attached Asrock Timing Configurator screenshots so you can see the other timings that were trained for each freq. Here are some screenshots from both single and dual rank kits showing the auto timings that were trained: https://imgur.com/a/hYNo2qC

I used only as much voltage as necessary to complete a run and did not play with increasing voltage for additional stability or to see how it impacted a score. For this testing I only used a limited range of frequencies based on the limitations of the kits themselves, would be interesting to see if it keeps scaling linearly. With these limitations lets take a look at the numbers:

16gb Single Rank
Speed/cl	Result 1	Result 2	Result 3	Avg result
Jedec	12164	12033	12363	12186.67
4000cl15	13408	13481	13198	13362.33
4100cl15	13555	13583	13519	13552.33
4133cl15	13596	13557	13516	13556.33
4200cl15	13853	13768		13810.50
4266cl15	13747	13789	13763	13766.33
4300cl15	13923	13926	13896	13915.00
32gb dual rank
Speed/cl	Result 1	Result 2	Result 3	Avg result
Jedec	12873	12798	12855	12842.00
4000cl15	15852	15776	15796	15808.00
4100cl15	15880	15796	15845	15840.33
4133cl15	15958	15912	15859	15909.67
4200cl15	15856	15905	15954	15905.00
4266cl15	16001	15976	16004	15993.67
How much faster is Dual Rank?
Speed/cl
Jedec	655.33
4000cl15	2445.67
4100cl15	2288.00
4133cl15	2353.33
4200cl15	2094.50
4233cl15	2227.33
4300cl15	NA

As you can see dual rank is slightly faster at jedec speeds (I didnt look at jedec timings to make sure they were the same, but how close those scores are seems to indicate they are the same), but it surprised me at just how much faster the dual rank kits are once they get up to 4000cl15. Some of this may be obvious to the more experience benchers, and looking at the world records they use a large amount of memory, but I thought it was interesting to have actual numbers to see just how much better the dual rank is. I would love to see someone with a quad or higher channel setup and see how their numbers scale with these.

Edited August 27, 2020 by Midnight703
added SS link, typing error

[Bruno]

Great work! Thank you for sharing.