AMD Ryzen 7 9700X Performance With DDR5-8000

[phoronix]

Phoronix: AMD Ryzen 7 9700X Performance With DDR5-8000

With the new AMD Ryzen 9000 series processors the AGESA supports up to DDR5-8000 memory. With yesterday's testing of the AMD Ryzen 5 9600X and Ryzen 7 9700X review all of the tests were done at DDR5-6000 in matching with the Ryzen 7000 series and Intel Core 13th/14th Gen configurations. In this article today is an initial look at the DDR5-8000 performance with the AMD Ryzen 7 9700X while using Corsair Vengeance 2 x 16GB DDR5-8000 DIMMs (Corsair CMH32GX5M2X8000C36).

https://www.phoronix.com/review/ryzen-7-9700x-ddr5-8000

[emansom]

So little to no gain besides massive IMC degradation?

Think i'll stick with in-warranty 5200 MT/s.

Thanks for testing Michael!

[ptr1337]

I think there is currently something wrong with the AGESA or equal.

A "syntethic" AIDA64 bench from JEDEC showed generally are great improvement to 6000 too.
Improving the timings or even increasing to 6400 1:1 (yeah, you need to have correct dies) increased the throughput also for some percentages.

Computerbase showed also an AIDA64 screenshot and benchmark, and there was mostly zero improvement visible in that benchmark going from 5600 to 8300.
See:
https://www.computerbase.de/2024-08/...-9700x-test/2/ (you need to scroll down a bit)

[duby229]

I think the bottleneck here is in the fabric connecting the memory controller to the CPU. From what I've read it's tuned for 6000MT/s. So going from CPU cache to RAM crosses that fabric. RAM at 8000MT/s is still going to be bottlenecked by it

[edxposed]

It would be nice to add the impact of ECC and different frequency on idle power consumption and load power consumption. Hopefully there will be JEDEC ECC/non-ECC/OC RAM performance and power consumption benchmarks in the future when 9000X3D is launched.

[onlyLinuxLuvUBack]

just wait until they rewrite the fabric in rust

[chuckula]

I wasn't expecting night & day benefits but frankly most of the real-world tests on there seem to like the lower latency RAM better. At least you can save money by not having to buy the most expensive stuff for performance.

[chuckula]

I think the bottleneck here is in the fabric connecting the memory controller to the CPU. From what I've read it's tuned for 6000MT/s. So going from CPU cache to RAM crosses that fabric. RAM at 8000MT/s is still going to be bottlenecked by it

There have been multiple rumors that AMD wanted to do a big memory controller/fabric upgrade for Zen 5 that didn't pan out and got pushed to Zen 6... these results seem to fit that. At least the high-speed memory works, you just don't get a big benefit.

[Type44Q]

I'm surprised that the go-to stuff isn't DDR5-6400 CL28.

[aerospace]

Where are the youtube reviewers claiming instability like there's no tomorrow?

Edit: from the website the official controller speed should be 5600