[otokemo]

Is there any way to compare those two?
We still don't know anything about latests perfromance?

Some of 5965WX's benchmarks:
https://www.phoronix.com/review/amd-...ipper-5965wx/3

[flotus1]

7950X3D has not been released yet. So any benchmark results from reputable sources -if they exist at this point in time- are still under NDA.
You will have to wait until end of February. Of if you absolutely can't wait, take CFD results for a 7950X, and add 20% as a ballpark figure.
The increased LLC is not some magic bullet. It helps a bit, but not nearly enough to make up the difference between dual-channel DDR5 vs. octa-channel DDR4.

If you want the performance of a TR-5965WX for less money, regular Epyc CPUs deliver exactly that. The Epyc 7443P costs about 1000$ less, and can be used on cheaper motherboards. Small differences in core clock speed don't translate into huge performance differences.

[otokemo]

Originally Posted by flotus1

7950X3D has not been released yet. So any benchmark results from reputable sources -if they exist at this point in time- are still under NDA.
You will have to wait until end of February. Of if you absolutely can't wait, take CFD results for a 7950X, and add 20% as a ballpark figure.
The increased LLC is not some magic bullet. It helps a bit, but not nearly enough to make up the difference between dual-channel DDR5 vs. octa-channel DDR4.

If you want the performance of a TR-5965WX for less money, regular Epyc CPUs deliver exactly that. The Epyc 7443P costs about 1000$ less, and can be used on cheaper motherboards. Small differences in core clock speed don't translate into huge performance differences.

Thanks!
Are there other recommendations on Epyc other than 7443p (With budget of 2k for a CPU)?
Should I go with general recommendation of 2-4 cores per memory channel?

[flotus1]

Among new single-socket CPUs, the 7443P is still peak price/performance.
If we extend the search to used CPUs, the Epyc 7532 is noteworthy. They are fully enabled Zen2 packages, i.e. 32 cores with 256MB of L3 cache. One of them delivers higher peak performance than a 7443P, and you can use two of them simultaneously. They cost around 600-700€ on ebay.

[otokemo]

Originally Posted by flotus1

Among new single-socket CPUs, the 7443P is still peak price/performance.
If we extend the search to used CPUs, the Epyc 7532 is noteworthy. They are fully enabled Zen2 packages, i.e. 32 cores with 256MB of L3 cache. One of them delivers higher peak performance than a 7443P, and you can use two of them simultaneously. They cost around 600-700€ on ebay.

Thanks, I was looking at the benchmarks and can't understand why 7532 has a better performance than 7542 ��

[flotus1]

That's the "fully enabled" part.
7532 has its 32 cores distributed across 8 active CCDs, i.e. 256MB of L3 cache.
7542 also has 32 cores, but only 4 active CCDs. Hence only 128MB of L3 cache.
The latter reaches higher core clock speeds, because caches need power. But for CFD, the increased cache size helps more.

[otokemo]

Originally Posted by flotus1

That's the "fully enabled" part.
7532 has its 32 cores distributed across 8 active CCDs, i.e. 256MB of L3 cache.
7542 also has 32 cores, but only 4 active CCDs. Hence only 128MB of L3 cache.
The latter reaches higher core clock speeds, because caches need power. But for CFD, the increased cache size helps more.

Noted! Thanks
Just a one more quick question Alex, 7742 looks affordable on Ebay ($800-1000) should I go with that one?

[flotus1]

The ones in the 800$ range seem to have some known defects. Like missing memory channels.
And 1000$ is probably not worth it, since scaling really isn't there beyond 32 cores per CPU.

[otokemo]

Originally Posted by flotus1

The ones in the 800$ range seem to have some known defects. Like missing memory channels.
And 1000$ is probably not worth it, since scaling really isn't there beyond 32 cores per CPU.

Thanks!
What do you think about this? (The questions aren't ending )
https://www.ebay.com/itm/31418791242...Bk9SR7LitYnFYQ

[flotus1]

Meh, you can get that cheaper without a bundle. And the memory here is only 4 DIMMs, with DDR4-2666. DDR4-3200 reg ECC is so cheap these days, it is rarely worth buying used.
https://geizhals.eu/?cat=ramddr3&htt..._RDIMM+mit+ECC
2.7€/GB for 32GB DIMMs, 3.4€/GB for 16GB DIMMs.

[wkernkamp]

The included four memory sticks are DDR4-2666 which is slower than the DDR4-3200 that you should aim for. Also, for good memory performance, you should fill all dimm slots and not just 4.

[otokemo]

Originally Posted by wkernkamp

The included four memory sticks are DDR4-2666 which is slower than the DDR4-3200 that you should aim for. Also, for good memory performance, you should fill all dimm slots and not just 4.

Originally Posted by flotus1

Meh, you can get that cheaper without a bundle. And the memory here is only 4 DIMMs, with DDR4-2666. DDR4-3200 reg ECC is so cheap these days, it is rarely worth buying used.
https://geizhals.eu/?cat=ramddr3&htt..._RDIMM+mit+ECC
2.7€/GB for 32GB DIMMs, 3.4€/GB for 16GB DIMMs.

Yup you're absolutely right, but what about the motherboard? What I got most attracted to, was that the motherboard was included in the bundle.
What about this one?
https://www.ebay.com/itm/18532627993...Bk9SR9i0mq_FYQ

Or Should I get a newer motherboard?

[flotus1]

We are getting closer. You can buy that bundle, but be aware that you pay extra for convenience.
If we include parts that ship from China, which all your bundles did so far, the prices for components are:
H11DSi rev.2: 400$
Epyc 7532: 650$

Or Should I get a newer motherboard?

You could upgrade to Milan-X CPUs at some point with a new H12DSi or MZ72-HB0.
And of course you would get a new board, with warranty. Motherboards and PSUs are the components most likely to fail.
Whether that's worth the 800$+ price tag is up to you.

[otokemo]

Originally Posted by flotus1

We are getting closer. You can buy that bundle, but be aware that you pay extra for convenience.
If we include parts that ship from China, which all your bundles did so far, the prices for components are:
H11DSi rev.2: 400$
Epyc 7532: 650$


You could upgrade to Milan-X CPUs at some point with a new H12DSi or MZ72-HB0.
And of course you would get a new board, with warranty. Motherboards and PSUs are the components most likely to fail.
Whether that's worth the 800$+ price tag is up to you.

Ok got it.
Does this look good?
https://www.newegg.com/supermicro-mb...82E16813183795

I don't think I'm gonna upgrade to Milan-X, I think I will skip it and get SP5 or SP6 in couple of years.

[flotus1]

Yes, that's a compatible board, and the price is decent for 2023.

[otokemo]

Originally Posted by flotus1

Yes, that's a compatible board, and the price is decent for 2023.

I came up with this list, but I found brand new 7742s for the same price on Ebay http://bitly.ws/ADGB . Should I consider them?

1 SUPERMICRO MBD-H12DSi-N6-O Extended ATX Server Motherboard Socket SP3 https://www.newegg.com/supermicro-mb...82E16813183795
2 AMD EPYC 7532 2.4 GHz 256MB L3 Cache Socket SP3 200W 100-000000136 Server Processor https://www.newegg.com/amd-epyc-7532...9SIAJHSJRH9260
3 128GB 8x16GB DDR4-3200 PC4-25600 1Rx4 RDIMM ECC Registered Memory by Nemix Ram https://www.newegg.com/p/1X5-003Z-01...9SIA7S6AK03550
4 Dynatron A26 AMD Socket SP3 Aluminum Heatsink with Heatpipe Embedded https://www.newegg.com/dynatron-a26/...9SIAN0MBAR0862
5 SAMSUNG 980 PRO M.2 2280 2TB PCIe Gen 4.0 x4, NVMe 1.3c Samsung V-NAND Internal Solid State Drive (SSD) MZ-V8P2T0B/AM https://www.newegg.com/samsung-2tb-9...quicklink=true
6 CORSAIR RMx Series (2021) RM1000x CP-9020201-NA 1000 W* https://www.newegg.com/corsair-rmx-s...quicklink=true
7 NVIDIA Quadro M4000 8 GB GDDR5 https://www.newegg.com/p/1B4-00JY-001H2

[the_phew]

If memory capacity matters at all to you, I'd stay away from desktop motherboards. Neither LGA 1700 nor AM5 motherboards can handle more than two DDR5 DIMMs without downclocking the memory to DDR4-like speeds. And the largest capacity DDR5 desktop DIMMs you can currently purchase are 48 GB, at a mere 4800 MT/s at that. So if you're trying to use a current-gen desktop processor for CFD, you're effectively capped at 96GB of RAM right now.

As noted above, server CPUs are almost always the best bet for CFD/FEA, even if you have to go a generation or two older. Gobs of memory bandwidth and more memory capacity than you could ever need. We run CFD on a TR Pro 5975WX workstation, but parallel speedup was less than I expected. As flotus1 mentioned, the 'mere' 128 MB of L3 cache may be the culprit; EPYCs with lower clocks but 256+ MB of L3 cache are the way. 3D cache is even better if you can swing it, but prepare to fork out major dough for those.

[wkernkamp]

Originally Posted by otokemo

I came up with this list, but I found brand new 7742s for the same price on Ebay http://bitly.ws/ADGB . Should I consider them?

1 SUPERMICRO MBD-H12DSi-N6-O Extended ATX Server Motherboard Socket SP3 https://www.newegg.com/supermicro-mb...82E16813183795
2 AMD EPYC 7532 2.4 GHz 256MB L3 Cache Socket SP3 200W 100-000000136 Server Processor https://www.newegg.com/amd-epyc-7532...9SIAJHSJRH9260
3 128GB 8x16GB DDR4-3200 PC4-25600 1Rx4 RDIMM ECC Registered Memory by Nemix Ram https://www.newegg.com/p/1X5-003Z-01...9SIA7S6AK03550
4 Dynatron A26 AMD Socket SP3 Aluminum Heatsink with Heatpipe Embedded https://www.newegg.com/dynatron-a26/...9SIAN0MBAR0862
5 SAMSUNG 980 PRO M.2 2280 2TB PCIe Gen 4.0 x4, NVMe 1.3c Samsung V-NAND Internal Solid State Drive (SSD) MZ-V8P2T0B/AM https://www.newegg.com/samsung-2tb-9...quicklink=true
6 CORSAIR RMx Series (2021) RM1000x CP-9020201-NA 1000 W* https://www.newegg.com/corsair-rmx-s...quicklink=true
7 NVIDIA Quadro M4000 8 GB GDDR5 https://www.newegg.com/p/1B4-00JY-001H2

If same price, get 7742. CFD about same performance, but slightly higher single core clock and twice the cores to run Cinebench and show off to your friends.

[otokemo]

Originally Posted by wkernkamp

If same price, get 7742. CFD about same performance, but slightly higher single core clock and twice the cores to run Cinebench and show off to your friends.

Really? It seemed like 7742 has a better performance with some setups
https://www.amd.com/system/files/doc...erformance.pdf

[flotus1]

I see no point in buying these CPUs in "new" condition.
Just look at the seller rating. You would be better off just buying them used on ebay for half the price.
The CPU coolers are for servers, and rated for only 180W. They might work for these CPUs, just be aware that they are loud. What is this going to be? A workstation or a server? Which chassis do you intend to use?
Nemix RAM should be avoided at all costs, especially for AMD systems. Get Samsung/Micron/Hynix