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PC Processors

munkypoo
Journeyman III
‎10-16-2019 09:43 PM

3900x is not reaching boost speeds post ABBA

Hello,  I'm still not reaching 4.6 boost clocks on my 3900x, only maxing 4.39.  I'm running the newest bios from Asus and installed the newest chipset driver from AMD.  I've tried running PBO but it's still the same. I have a Asus crosshair viii wifi and am using HWinfo to monitor clock speeds. Any help is appreciated.

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2 Replies
kazinvan
Adept I
‎10-19-2019 10:26 PM

Similar issues with my 3800X.  Tried so many things I'm going cross eyed.  

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kazinvan
Adept I
‎10-21-2019 11:57 AM

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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