Hello everyone.

Just performed some tests on my 7800x3d and i wanted to share some results from Cinebench.

Cooler: Dark Rock Pro 4 - fan curve set to Standard

Case: Pure Base 500 FX

MB: Asrock X670E Steel Legend

Results:

• CO disabled: 17473 points, max. temperature (c): 88.1, boost clocks 4.8 GHZ

• CO enabled (-30 all cores): 18190 points, max temperature (c): 84.4, boost clocks: 5 GHZ

Hi guys,

I bought a 7800x3d, and so far I really enjoy it. I'm trying to set PBO + curve optimizer and coming from a 5900x and reading a lot of guides, it looks like best cores should not be able to have lower negative offset than the other ones. But so far my settings are:

core 0 -30

core 1* -35

core 2 -30

core 3** -30

core 4 -30

core 5-30

core 6 -20

core 7 -30

According to Ryzen Master, my best core is core 1* and second best is core 3**.

I rigorously tested these settings with OCCT, prime95 overnight and corecycler, an I had no errors.

So my question is, is it normal that my best core can handle such a low negative offset, lower than the "regular" cores? Also, for core 6, I couldn't get lower than 20, as it gave me errors. That is weird because according to OCCT, it should be the worst core out of them.

Thank you for your answers!

PC components: 7800x3d, 7900xtx, 32gb ram corsair vengeance 6000mhz cl30, Gigabyte b650 aorus elite ax rev 1.2.

I built my first pc couple of weeks ago and I limit vsoc to 1.2njust for precaution and saw many posts about the PBO and curve optimizer so I set it to -20.

I know CO allows my cpu to run beyond its limit for better performance, but what exactly does it do?

• Does it affect performance in gaming?

• Does it lower temps or increase them?

• Does it affect the cpu lifespan?

• Difference between negative and positive offsets

• And most importantly do I really need it?

Thanks a lot and sorry for asking too many questions!

Asking because it seems while browsing that most of them can't achieve anywhere near that and I want to make sure I'm not just hallucinating stability as it's my first Ryzen system ( last AMD system was an Athlon that served me well ).

Here's how it went. I first updated the bios to the latest version from MSI. Then installed Ryzen Master and Cinebench R23 as well as several other stress tests like Prime 95, AIDA, etc. I have the CL30 6000 ram on EXPO settings ( VDDIO lowered to 1.3 manually, EXPO had set it to 1.4 :/ ), also set memory context restore to enabled for the absurdly faster boot times.

Went in -5 steps on the curve optimizer, ran the included Ryzen Master "stress test" for stability, then ran a Cinebench with all apps I could stop stopped in windows for ideal replicability of results ( cinebench results can fluctuate quite a bit even doing this ), anti virus off and everything I could think of.

Noted the results and kept going on with more -5 steps. Turns out that -30 is where if I go any further, I start getting consistent performance degradation. -25 will get worse results, same for -28, -35 and -32.

After that I ran a suite of Prime 95, AIDA, IBT and as many other stability stress tests I could. Then ran a few games ( Helldivers 2, Rimworld, Baldur's Gate 3 and a few others ), browsed, used handbrake and encoded a few videos with AV1, H265 and H264. Watched a few videos on youtube and MPC-HC and finally let it sit idle overnight with only HWinfo64 pinging the processor every 5000 milliseconds for info.

It's only been 24 hours and not a single crash yet. crosses fingers

Is there anything else I should look out for as far as voltages, settings, stability testing goes?

Any particularly finicky apps/games that are more prone to detect instability?

All counsel and tips would be greatly appreciated!

EDIT:

Thanks for the all the feedback. I'll put it to good use! :)

My setup: 7800x3d ROG x670-e 64GB cl30 6000mt g skill z5 ram Nitro+ 6900xt ROG Ryujin III 360 aio

I have set all of my cores to -22 on the curve optimizer, cpu boost clock override and precision boost overdrive is set to AUTO, EXPO I is enabled, memory frequency is at 6000MHz, PBO Limits are set to Motherboard, and PBO enhancement is set to enabled.

When I run Cinebench r23 multicore I received a score of 18290. Watching task manager, all cores stayed at 100% with quick dips only when the entire image finished. My temperatures never broke 70C. Does this mean I need to increase the curve optimizer values or decrease them more? Should I change any other settings in PBO enhancement? Basically from this point what should I do to push the cpu harder?

Should i just set it to -30 and forget about it? And it seems the msi bios update is setting vsoc to 1.3 should i change it to 1.25?

My stock CB score is 18300. Using -15 on CO yields me the same score. I've tried -25, -30 but those are unstable. What am I doing wrong? I'm fairly new to tinkering with my CPU.

Hi all,

My 7800X3D is currently scoring slightly below 14k on TimeSpy, ~18,300 on Cinebench R23. Decent scores, but was hoping to squeeze out a bit more with some UV / OC magic.

In my BIOS I YOLOed the curve optimizer all the way to -50; figured I'd let it crash and work my way up from there.

But nothing changed. No difference in thermals, no instabilities, benchmarks all the same. I opened Ryzen master to try and load the BIOS settings and it keeps telling me that CO is turned off even though it's very clearly set to 'all core -50' in BIOS.

Am on latest chipset drivers as well as bios.

What gives? Anybody have any thoughts? What's a good way to verify my CO settings?

Each CCD sharesone voltage rail for all the cores within that ccd. Most people assume that since curve optimizer allows per core offsets then each core has its own dedicated voltage rail for each specific core however this is NOT the case. If 1 or more cores are active (not parked) and they have a different offsets then the SMU will pick the lowest offset of the group and that’s what you will run at. It doesn’t care that every other core is at -60, if you have one core at -5 and all cores are active then the cpu will effectively run as a -5 offset cpu.

Per-core CO helps single/light-thread boost. (Think single core benchmarks, marketing) no modern AAA game runs on 1 or 2 cores, the year is not 1999)

TL/DR: Worst core dominates anything beyond ideal single threaded conditions.