Extreme Overclocking AMD's R9 9950X CPU to 6.6GHz

[Kenrou]

"The AMD Ryzen 9 9950X CPU is the first Zen 5 CPU benchmark we've seen, and it's starting with extreme overclocking to 6.6GHz. In fact, some of the 9950X benchmarks beat the 7950X world records at significantly lower clocks -- sometimes as low as 5.85GHz on the 9950X to a prior 6.7-6.9GHz on the 7950X. We'll also spend time talking about the new Curve Shaper, which will stack atop the prior Curve Optimizer for Ryzen."

00:00 - World Records on the Ryzen 9 9950X
01:46 - Curve Shaper Explanation for Ryzen 9000
06:43 - Liquid Nitrogen Overclocking Setup
13:11 - Cinebench R23 World Record (16-Core)
19:00 - Cinebench R15 World Record (16-Core)
20:21 - WPRIME World Record (16-Core)
21:38 - Conclusion & Wrap

 

[DaveB]

9950X HWUB review very disappointing.

 

[Kenrou]

 

[mackerel]

The AMD Ryzen 9 9950X and Ryzen 9 9900X Review: Flagship Zen 5 Soars - and Stalls

www.anandtech.com

Haven't caught up yet but I saw AT mention they observed higher than expected latency when going across cores on different CCD. ~76ns on Zen 4 vs 180ns on Zen 5. They are still digging but one possible mechanism is the cores are aggressively going to sleep for this test, so needs more time to wake up. If so, this wouldn't impact continuous loads.

Edit: fixed link. I copied and pasted the wrong one initially.

 

[]-[itman]

I initially posted in the 9700x thread, but moving it here.

9950x reviews are out. Surprisingly, although the TDP is the same as the 7950x (170 W), the PPT has been reduced from 230 W to 200 W, so it won't use as much power when under an all core load. Overall, performance improvement is still low, but efficiency is significantly improved. Another surprise is that AMD has now added a core parking algorithm for the dual CCD designs that park the cores on the non-active CCD. This should lower power consumption in single or lightly threaded workloads (44% efficiency improvement in ST load according to TPU) and help improve gaming performance. The gaming performance part seems to be hit and miss according to reviews, but there is a question as to whether or not reviewers have the driver installed and working correctly as AMD didn't tell reviewers about it until a few days ago.

Zen 5 in the 9950x once again shows very strong performance in Linux, pretty dominant actually. In Phoronix's testing, it showed overall an 18% performance improvement over the 7950x, across a very wide range of programs, while using 3% less power on average.

AMD Ryzen 9 9950X Review - The New Flagship

With 16 cores and 32 threads, the Ryzen 9 9950X, powered by AMD’s Zen 5 architecture, is the fastest desktop processor we've ever tested. In our review, it breezed through application workloads and delivered high FPS rates in gaming. But at $650, it doesn’t come cheap.

www.techpowerup.com

AMD Ryzen 9 9950X & Ryzen 9 9900X Deliver Excellent Linux Performance Review - Phoronix

www.phoronix.com

@mackerel I believe what AT is seeing is due to the new core parking behavior in the new chipset driver I described above, which explains why the latency is so high in their test.

 

[mackerel]

PPT has traditionally been 35% above TDP, so is this new?

Even with the delay they can't communicate appropriate drivers and configuration to reviewers?

Fortunately I'm in no rush, but I'm still wondering about a Zen 5 CPU to retire my 7980XE.

 

[]-[itman]

PPT has traditionally been 35% above TDP, so is this new?

Even with the delay they can't communicate appropriate drivers and configuration to reviewers?

Fortunately I'm in no rush, but I'm still wondering about a Zen 5 CPU to retire my 7980XE.

Yes, the PPT being 200 W was a surprise. Obviously enabling PBO lets you get above it, but no one expected it to be reduced from the 7950x by default.

 

[Janus67]

9950X HWUB review very disappointing.

Just had time to watch it. Good god that's a mess. Granted I'm on a 5900x and it will be better vs those that are on a 7xxx series. I will wait to see what happens with a 9xxxX3D model and see how (if any) performance improvement is made before I decided what to do with my current build. My youngest is now asking for his own computer so he and his brother can play together (and with me on occasion) so a hand-me-down from my existing machine would be pretty close to matching the same specs in the other machine (minus being a 5800X3D).

That plus waiting to see what the hell the 5xxx series GPUs from nVidia end up being I'll have some time to save up and contemplate. Realistically considering a 5090 at this time just to allow me to max out my 4K display for as long as possible.

 

[wade7575]

The AMD Ryzen 9 9950X and Ryzen 9 9900X Review: Flagship Zen 5 Soars - and Stalls

www.anandtech.com

Haven't caught up yet but I saw AT mention they observed higher than expected latency when going across cores on different CCD. ~76ns on Zen 4 vs 180ns on Zen 5. They are still digging but one possible mechanism is the cores are aggressively going to sleep for this test, so needs more time to wake up. If so, this wouldn't impact continuous loads.

Edit: fixed link. I copied and pasted the wrong one initially.

From what this guy is saying in his video AMD told him something about the PPM driver which has something to do with talking to the CCX I think,he saying something about it at the 10:09 point in the video I think.

At around the 8:44 point in the video this guy mention's he tested the 7800 X3D cpu on the same system then for whatever reason does a fresh install of Windows and then gets different numbers when he goes back and bench marks the cpu again,he say's it doesn't appear to be just a Zen 5 problem but a Ryzen problem and is supposed to addressed in a future update.

I'm not holding my breath because I want to do a 9900X build and if I do it will be because the cpu's seem to run stable and the 9900X seem's to be fairly easy to cool from what I have seen so far.

I hope that the X870E mobo's will work better with the new 9900X and 9950X.

 

[]-[itman]

From what this guy is saying in his video AMD told him something about the PPM driver which has something to do with talking to the CCX I think,he saying something about it at the 10:09 point in the video I think.

At around the 8:44 point in the video this guy mention's he tested the 7800 X3D cpu on the same system then for whatever reason does a fresh install of Windows and then gets different numbers when he goes back and bench marks the cpu again,he say's it doesn't appear to be just a Zen 5 problem but a Ryzen problem and is supposed to addressed in a future update.

I'm not holding my breath because I want to do a 9900X build and if I do it will be because the cpu's seem to run stable and the 9900X seem's to be fairly easy to cool from what I have seen so far.

I hope that the X870E mobo's will work better with the new 9900X and 9950X.

The driver he's talking about is meant to keep a program to using only a single CCD (chiplet) unless it needs more than 8 cores. The reason for this, is that there is a penalty for migrating a thread from one CCD to another (it takes time). If it just happens once, it's not a big deal, but if it is happening over and over again, it can hurt performance quite a bit. The driver is meant to fix this by keeping all the threads associated with a program on one CCD unless it requires the additional cores. This is the same thing they introduced with Zen 4X3D CPUs with more than 1 chiplet to keep games on the chiplet with the extra Vcache. For Zen 5, there seems to be an extra latency in migrating a thread from one CCD to another, probably due to a new power saving algorithm, so AMD introduced a similar driver for Zen 5 that they had with Zen 4X3D.

The problem is that this driver is specific to Zen 5, so if you install the driver without Zen 5 in the system, it won't work properly. If you install it with Zen 5 in the system, but then switch CPUs to a Zen 4 CPU, it won't work properly. If you swap CPUs, you need to fully uninstall the chipset driver and install it again.

If gaming is a big portion of your computer use, or even if gaming performance is important, it would be better to wait for the Zen 5X3D chips or just go with the Zen 4X3D chips now.