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kazinvan
Adept I

Poor Single core Performance with new 3800X

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Lifetime Intel user but with my new build I decided to try Ryzen as the performance just can't be ignored.  I went with a 3800X as it was bundled the board I wanted for a good price.  Everything got set up, posted first time, Windows installed, all good.  

I then started to bench it, multi core is fine and right in line with what others are getting (CPU-Z, Cinebench). But single core seems lacking.  I'm getting 410-430 on Cinebench 20 single core and others seem to be getting 500+.

CPU: 3800X

Mobo: Asus TUF X570-Plus

RAM: G.Skill Trident Neo (F4-3600C16Q-64GTZNC) 3600MHz - CL16-19-19-39

GeForce 1660

Some things I have tried

- bios defaults

- bios performance profile 

- Ryzen Master, various profiles

- Different Windows profiles (Performance, Ryzen Balanced)

- AMD chipset from Asus and from AMD

- Flash latest Mobo BIOS

- All Windows Updates

- Too many BIOS overclocking profiles to count.  

I did manage to get the RAM running at 3600MHz, it wasn't by default.  

When I'm running single core bench, none of the cores seem to scale up anywhere close to 4.5GHz.  Even when I'm running multi-core bench, I'm getting about 4.3 max.  

I'm not a gamer, I do photo editing mostly and some video.  Single core performance is important as many photo apps or functions in the apps are just single threaded.

I'm hoping to figure out where the issue is because right now the single core performance is worse than the three year old 6700K it replaced.  Anyone have any ideas on what to try?

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kazinvan
Adept I

Re: Poor Single core Performance with new 3800X

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I think I have this sorted out, benchmarks are above spec so no complaints and after many hours I'm not going to try and go higher in OC. I *think* the problem was RAM timings. The default DOCP profile was setting ram (which is native 3600-16-19-19-39) to 3603MHz which means the fabric was 1802. From what I have read, when Ryzen fabric is >1800 you lose the 1:1 coupling resulting in worse performance unless you get to very fast overclock levels.

I spent hours trying to sort this out. Manually setting RAM to 3600 and fabric to 1800 caused the PC not to post. I had to pull the CMOS battery and disconnect all my drives to get it to post again. Did this song and dance many times before I landed on a CPU OC that worked with RAM set to 3533MHz (CL16-19-19-39) and fabric set to 1767. This keeps it at 1:1, and gets my RAM very close to spec.

The biggest issue for me was single core performance numbers, which went from about 420-430 up to 545 on Cinebench 20 (4826 multi). Rest of the benchmarks look good too.

UserBenchmark : https://imgur.com/a/hICPmEq
PassMark : https://imgur.com/a/lRp5NHf
RyzenMaster : https://imgur.com/a/A9wGwQK

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2 Replies
kazinvan
Adept I

Re: Poor Single core Performance with new 3800X

Jump to solution

I think I have this sorted out, benchmarks are above spec so no complaints and after many hours I'm not going to try and go higher in OC. I *think* the problem was RAM timings. The default DOCP profile was setting ram (which is native 3600-16-19-19-39) to 3603MHz which means the fabric was 1802. From what I have read, when Ryzen fabric is >1800 you lose the 1:1 coupling resulting in worse performance unless you get to very fast overclock levels.

I spent hours trying to sort this out. Manually setting RAM to 3600 and fabric to 1800 caused the PC not to post. I had to pull the CMOS battery and disconnect all my drives to get it to post again. Did this song and dance many times before I landed on a CPU OC that worked with RAM set to 3533MHz (CL16-19-19-39) and fabric set to 1767. This keeps it at 1:1, and gets my RAM very close to spec.

The biggest issue for me was single core performance numbers, which went from about 420-430 up to 545 on Cinebench 20 (4826 multi). Rest of the benchmarks look good too.

UserBenchmark : https://imgur.com/a/hICPmEq
PassMark : https://imgur.com/a/lRp5NHf
RyzenMaster : https://imgur.com/a/A9wGwQK

View solution in original post

StephenD
Journeyman III

Re: Poor Single core Performance with new 3800X

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You think you had problems, I’m now getting 99 in single thread perf in cpu-z

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