Zen 2 details announced

[M344587487]

A 4500u review in video form if that's your thing, tl;dr tasty: https://www.youtube.com/watch?v=lfkvZc-8ZU8

[M344587487]

The rumoured split of Threadripper into 4 and 8 channel variants has materialised, it's interesting but not too exciting as it's OEM-only. tl;dr it's Epyc single socket but on steroids with the PRO moniker and all the validation/support that comes with it. 280W TDP and the process is more mature than when Epyc v2 was released so no doubt it's powerful but not for mere mortals.



https://www.tomshardware.com/news/am...620-intel-xeon


https://www.youtube.com/watch?v=0g743FW0h_k

[ATH]

The 4 new Zen 2 Threadripper Pro cpu's 3945WX, 3955WX, 3975WX, 3995WX all have octa channel RAM.
I'm curious about Prime95/mprime performance if anyone gets access to one with 8-channel RAM.
Unfortunately they are only sold OEM, so you cannot build your own computer.

[lycorn]

Originally Posted by ATH

Unfortunately they are only sold OEM, so you cannot build your own computer.

Moreover, they would cost you an arm and a leg, which is an even more compelling reason to not build one...

[ATH]

Yeah, I'm not planning to buy one unless I win big in the lottery maybe. But I'm still curious to see how much 8-channel RAM does.

We have seen benchmarks of more expensive hardware on the forum like Titan V100's etc. so someone might be able to do a benchmark at some point.

[lycorn]

Well, according to Tomshardware, they will soon be available for the mere mortals (provided they are willing to fork out some ludicrous amount of cash):

https://www.tomshardware.com/reviews...-3995wx-review

Alas, the price is not listed yet. I will have to wait a few more days before I am able to order one... LOL

I agree it would be very interesting to see some benchmarks relevant to GIMPS work, particularly for FFT sizes that don´t fit in the caches.

[LaurV]

For the double of the power consumption of an high-end i9, it doesn't seem to get double the performance. My advice: wait. Don't just jump into it to spend your money. This is a power-hungry beast, and you have to invest more than the CPU cost to make it working. Like more memory blades, more expensive mobo, more electricity, etc. If you have the money and are in hurry and have nothing else to do with them, buy two i9s
Edit: also, in those tests, having a Nvidia card in a full-AMD rig? C'mon man!

[Viliam Furik]

Originally Posted by LaurV

For the double of the power consumption of an high-end i9, it doesn't seem to get double the performance. My advice: wait. Don't just jump into it to spend your money. This is a power-hungry beast, and you have to invest more than the CPU cost to make it working. Like more memory blades, more expensive mobo, more electricity, etc. If you have the money and are in hurry and have nothing else to do with them, buy two i9s

Based on 3970X benchmarks from user "Hugemon", which I got last April, I can estimate the throughput of 3975WX for 2 workers (5600K FFT -> about 44 MiB of L3 cache) to be about 780 it/s. If we consider 3 workers, which could bring up similar behaviour as in desktop Ryzen chips, when 3 workers result in heterogeneous times (e.g. 2 ms, 3 ms, 4 ms), then potential throughput is about 1100 it/s.
Considering that similar would happen on 3995WX, and assuming the power consumption would be the same for real, taking lower frequency into account, potential throughput is about 1800 to 2000 it/s.

These are just my guesstimates. Take them with a grain of salt.

If you compare it to the real performance of the mentioned i9, I think you should see more than double the performance, with the small L3 cache on Intel chips. But I am not aware of the i9's performance, just guessing it.

Originally Posted by LaurV

Edit: also, in those tests, having a Nvidia card in a full-AMD rig? C'mon man!

How can you consider it full-AMD, with only the processor being AMD? Isn't it that the GPU must also be AMD for the rig to be considered full-AMD?