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I had a B0 5950X that degraded from getting to throttle temps for a few minutes while testing it. It was replaced under warranty, and I have a B2 now. It clocks higher. R23 is pushing over 29k multi-core, which is better than what the B0 did. It would do 4.4 Ghz all-core, this one is doing 4.5-4.6 with stock volts and PBO. I'm inclined to think the later stepping may be the better chip, or else I had a real dud.

So it degraded for only a few minutes at 90C or a little higher? I did not think they could degrade that fast for only a few minutes or even a couple hours? Just running it for days at those temps I thought would degrade it??
 

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I have 3 CPUs at my disposal, but I cannot unpack them and test them, must pick one and that one stays. I want to get B2 stepping, so please tell me what do you think, which one is safest bet.

2x Ryzen 7 5800X - BG 2139SUS (Made in China)
1x Ryzen 9 5900X - BG 2152PGS (Made in Malaysia)
 

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I got a 5900X in Austria yesterday for 410€. Production code is BG 2205SUT, the CPU is a B2 stepping. I haven't tried OCing (inc. memory) yet, as I want to be sure that everything works like it's supposed to first, so a regular DDR4-3200 CL16-18-18-18-36-56-1T-GDM OFF at 300ns tRFC for my 2x16GB DR CJR it is atm. CPU-Z single core yields 665-675 points, Cinebench R20 multi is ~9730pts IIRC.

What I've noticed is that Ryzen 5000 is extremely energy efficient compared to my old 3900X. Compiling code yields me 4,45Ghz sustained all-core instead of 4,05Ghz, while having lower per-core energy consumption (10W instead of 12~13W). I do also regularily see 4.85-4.9Ghz single core boosts and my "weakest core" on CCD2 can sustain 4,575Ghz (still higher than the 4.45Ghz the 3900X could hold) in a single threaded, core pinned 7z compression benchmark. Elden Ring shows 4.65 to 4.75Ghz during gameplay.

Temps have been great so far. I haven't exceeded 70°C yet with custom liquid cooling (Phanteks Glacier C350AP). Also, there haven't been any sound, USB or PCIe issues w/ my X570 Aorus Pro r1.0 F34. I let my frequency monitor run over night to see what the boost algo does in background loads (this is on Linux without the amd-pstate driver which can increase boost further):
Font Screenshot Pattern Number Document

I think I got a pretty solid chip here. I'm curious to see what sustained clockspeeds I'll be able to achieve with curve optimizer and how far I can push my FLCK. My old 3900X could boot 2033Mhz FCLK and somewhat easily stabilize 1900Mhz.
 

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Hi all! Is there a way to check whether a 5900X has B2 stepping without taking it out of your PC?
For instance, I am looking at a second hand one, and in CPUID it says Family F, Model 1, Stepping 2. Is that a B2 stepping one? TDP is 105watt.
 

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Anyone knows if the 5950x sold by Amazon.de is already B2 ?
No luck for me: The 5950X I ordered from Amazon.de on 2022-04-18 was BG 2142SUS

Additional notes:
  • I returned it untested because the price was discounted at least twice even before receiving it
  • According to the shipment tracking it was originated from their warehouse in Roma, Italy
 

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No luck for me: The 5950X I ordered from Amazon.de on 2022-04-18 was BG 2142SUS

Additional notes:
  • I returned it untested because the price was discounted at least twice even before receiving it
  • According to the shipment tracking it was originated from their warehouse in Roma, Italy
Thanks for the feedback, I may wait a little more then.
 

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BG 2145SUS -> B2

Overclocks like a beast and stays cool. 1900 IF WHEA free, got to try out more. I don't think B2 has anything to do with that at all, just luck with the lottery. 4.9 GHz CCX1/ 4.775 GHz CCX2 (1.344V):
Font Computer Screenshot Software Multimedia
 
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