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Ryzen 1800x + PRIME95

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post #1 of 4 (permalink) Old 05-06-2019, 11:40 AM - Thread Starter
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Ryzen 1800x + PRIME95

Well, heres the thing. My 1800x runs at 4.0ghz oc'd at 1.4v. It pass OCCT, AIDA64 and IBT, no problem. But when trying PRIME95 (latest version, released today), i get an error on small ftts...i bumped up the voltage to 1.425v, and still having issues. I've been running this CPU at these settings for a month, no issues whatsoever, but when i try prime, things dont look stable. One core gives me error. Should i bump the voltage? Is prime small fft linked to RAM anyhow? Does it have any bug related to Ryzen? In prime my CPU reaches 82c, using 1.425 LLC5.

Thx for any help!

CPU: AMD Ryzen 1800x @ 3,950 GHZ CPU COOLER: Aerocool P7-L240
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post #2 of 4 (permalink) Old 05-15-2019, 04:30 PM
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Well, there's 3 things you can try. More voltage, or cool it better, or reduce frequency. If it ain't stable, it ain't stable. There aren't any ryzen-specific bugs known for p95 v29.8 b3

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post #3 of 4 (permalink) Old 05-15-2019, 04:51 PM
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Put you ram to 2933 and bump Ram Voltage a little bit and try it out.Could be just CPU not stable at 4.0Ghhz. Then try 3.9Ghz
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post #4 of 4 (permalink) Old 05-23-2019, 06:28 PM
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1800X is funny. I was running at 4ghz 1.4v as well, one night I was playing, turned the pc off and went to bed. The next day 4ghz was not possible anymore, and it was stable, tested with aida, prime, ibt, games. Now 3.95ghz with 1.375v is game stable, crashes with prime, but finishes ibt and no problems with aida.

Sometimes I set again 4ghz/1.4v and runs just fine for days, and then suddenly I get a crash/shutdown etc. Then when gets into windows is not stable not even at 3.9ghz.

My cooling is alright, max of 75C when was 4ghz/1.4v.

Make sure your ram is stable with hci over 1500% (one instance for each thread) and then go back to your cpu oc.

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