PC Processors

[Ydoum]

Hi,

I literally installed my brand new 5900x hours ago.

Everything seemed fine until I started crashing and getting BSODs (no minidumps).

I googled far and wide and found a solution that disabling PBO and CPB might help - and it did. However, my CPU is now obviously underperforming since it's running always at stock 3.7gHz clock.

I would like to know whether the CPU I got is just "bad", or are there any other measures I can take to ensure that it's not the CPU that's at fault.

I will provide any information required to receive support; just ask away!

[t3chl0rd]

3.7ghz is just the base clock speeds, it boost beyond this. For me PBO was a huge learning curve, many different suggestions say stick PBO power limits to max, and set the PBO to -30 but not all chips are equal and is a lottery. Requires alot of testing and some good tools like "CoreCycler", I found that to high of power limits will degrade performance, and EDC should be left at 140 on current bios. Per core curve optimzer is the method I use and gains me the best results. Only reason it would be above stock speeds is if you use a manual overclock at around 4.5gHZ (stable) which would not be using PBO to achieve anyway. These chips run fairly well with PBO disabled and most bios settings on AUTO, which also doesn't void the warranty.

[rumple]

The problem is the newer BIOS.   Many of us were running negative 15 on all cores with less than 1 volt on the CCD.   The new BIOS shoved 1.15 volts into the CCD all day and after less than 3 weeks the CPUs are broken.  They no longer are able to use PBO without random restarts.

It's rather sad.  This CPU was working fine until I installed the new BIOS. 

I know for a fact that the old BIOS never put more than 1 volt into the CCD, and the new BIOS will put 1.15+ in there.

So bottom line, they made new default BIOS settings that work for NEW CPUS at the expense of degrading and ruining our OLD CPUs.  

I spoke to AMD and they (1) refuse to acknowledge the BIOS damage and (2) refuse to help replace the CPU

[rumple]

I could even argue it was intentional.  They want to sell new chips, and ooopsies, we fried your old chip... ooopsies... I guess you need to buy a new CPU.... SALE.  SALE

[atmosphere]

PBO also didn’t do wonders for my 5800x though have tried it with any newer BIOS version.

but please test stuff below:

(btw: what type&brand motherboard is it running? )

1st - check temps at low speeds.. if they are high: issue could be cooler (bad mount or paste).
2nd - check mainboard power connections (atx12V) and lookup which you need to use in the manual of the MB.

3rd - you could check Bios/UEFI/AGESA update with your MB vendor (if you didn’t already?) don’t recommend this one without checking 1 & 2

[EagerHarebell]

Hi! Congrats on the new 5900x, but sorry to hear about the issues you're facing. Disabling PBO and CPB helping does suggest it might be a stability issue with the boost settings. Have you tried updating your BIOS to the latest version? Sometimes, newer BIOS updates improve stability and compatibility. Also, double-check your RAM settings (like XMP/DOCP) to ensure they're not causing instability. If you’re still unsure, running a stress test like Prime95 or Cinebench can help pinpoint if it’s the CPU or something else. Hope this helps!