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post #2631 of 6026
@Mystical Did you ever figure out if the 7800x and 7820x have full AVX512 throughput the same as the 7900x?
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post #2632 of 6026
Quote:
Originally Posted by TahoeDust View Post

@Mystical Did you ever figure out if the 7800x and 7820x have full AVX512 throughput the same as the 7900x?

Yes, and both of them do. Here are my sources:

7800X:
7820X:
I've seen one other forum post from a low-level programmer saying that he personally tested the 7820X and found that it has both FMAs. But I can't find it.

In any case, both sources for 7820X are flaky since they're just forum posts. But the first 2 sources for the 7800X are about as strong as it gets. (That second one is the strongest source, but you need to know specifically which numbers to look for.)

Given that the 7820X is higher than 7800X, I see it very unlikely that the 7800X would have the full AVX, and that the 7820X doesn't with both sources being wrong.

I have yet to see any benchmarks that conflict with the stance that both the 7800X and 7820X have only one FMA. And I consider benchmarks to be stronger than Intel's word.


The fact that your overclock blew up when you ran y-cruncher AVX512 also (lightly) supports this. Because if it only had half-throughput AVX512, it wouldn't be much more stressful than AVX.
Edited by Mysticial - 8/31/17 at 1:18pm
post #2633 of 6026
Quote:
Originally Posted by Ostrava View Post

I think I'm gonna check the thermal mating between the CPU and waterblock, I have to modify my loop to switch out a gpu waterblock connector for a larger one anyways. I'll be back with results or lack thereof in a couple days.

Ok well I took apart my loop and put it back together, and I realized that when I first installed the 7900x I had installed the EK Evo Supremacy block wrong (I didn't screw down the thumb nuts to the end of the thread like it says in the manual, I only tightened them halfway down the thread cause I was going off an incorrect memory of how I did it on my previous CPU).

After reinstalling the waterblock OCCT is now running around 60-70C average on all cores with peaks in the low 80s and a package temp around 72 average with an 89C peak at 4.6GHz. Also the package power is running around 160W average now. Gonna clock back up to 4.7 later today and see how that goes. Thanks for your help @TahoeDust suggesting my cooling was messed up cause that was the problem.
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post #2634 of 6026
Quote:
Originally Posted by Ostrava View Post

Ok well I took apart my loop and put it back together, and I realized that when I first installed the 7900x I had installed the EK Evo Supremacy block wrong (I didn't screw down the thumb nuts to the end of the thread like it says in the manual, I only tightened them halfway down the thread cause I was going off an incorrect memory of how I did it on my previous CPU).

After reinstalling the waterblock OCCT is now running around 60-70C average on all cores with peaks in the low 80s and a package temp around 72 average with an 89C peak at 4.6GHz. Also the package power is running around 160W average now. Gonna clock back up to 4.7 later today and see how that goes. Thanks for your help @TahoeDust suggesting my cooling was messed up cause that was the problem.

Good job man! I'm glad I could help.
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post #2635 of 6026
Those temps are still high. My max core at 4.6 1.2vcore is like 88c on this mediocre deepcool captain, and I still don't think that's right.
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post #2636 of 6026
Quote:
Originally Posted by tistou77 View Post

If I read correctly last posts, the VCCIN increases in load (compared to the idle)
The inverse of the X99, just for curiosity

...
Thanks

No, in X99 VCCIN will tend to increase with load, at least using adaptive and a high enough LLC.
post #2637 of 6026
Quote:
Originally Posted by djgar View Post

No, in X99 VCCIN will tend to increase with load, at least using adaptive and a high enough LLC.
With my R5E and R5E10, LLC to 6, VCCIN in

Load : 1.80v
Idle : 1.857v

I've always seen this behavior on topics X99 worriedsmiley.gif
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post #2638 of 6026
Quote:
Originally Posted by sblantipodi View Post

those are a server necessity, not a PC/workstation one.
I'm a web developer for big Telco company and I develop using a laptop, than I put my software on a server.
What's the point to have the DB on a Workstation? X299 is a Workstation platform, not a server one.

You have to get outside your own box (metaphorical). Not everyone works on the same sort of problems you do in the same way with the same tools and within a wide range, none of them are "wrong".

So, um, ah, yeah, I do this on a "workstation" thumb.gif I do this because I can do it faster, I can experiment, I can debug, I can change out hardware, I can add disk space or use technologies that are not presently deployable (either at my company or anywhere yet).

I put even bigger stuff (like regressions of all that nastiness) on to a compute grid as needed, but that sort of stuff is my "day to day" interactive design/test/debug sort of work.

Why would I need a big giant DB on a "workstation"? Because its not a big giant DB that serves 10's of thousands of people. It's a big giant DB that serves little old me (and maybe a few other people, but not even at the same time).

I have, frequently, purchased used "big iron" hardware to experiment locally. A computer is a computer, the only magic is the price (and proprietary connectors/drivers)... I have old Sun, Alpha, HPux, IBM, etc... stuff (or had and long since tossed in some cases). Often not the sort of things you play BF1 on, but still just computers.
post #2639 of 6026
Quote:
Originally Posted by Mysticial View Post

I have yet to see any benchmarks that conflict with the stance that both the 7800X and 7820X have only one FMA. And I consider benchmarks to be stronger than Intel's word.
Yeah, either Intel rushed/goofed the "intel" or the benefit of the dual FMA is non-existent, but bottom line, you don't seem to lose anything with the lower SKUs empirically.

Quote:
Originally Posted by Mysticial View Post



The fact that your overclock blew up when you ran y-cruncher AVX512 also (lightly) supports this. Because if it only had half-throughput AVX512, it wouldn't be much more stressful than AVX.
Ditto on the 29C water temps...

Glad he found it.
post #2640 of 6026
Quote:
Originally Posted by tistou77 View Post

With my R5E and R5E10, LLC to 6, VCCIN in

Load : 1.80v
Idle : 1.857v

I've always seen this behavior on topics X99 worriedsmiley.gif
You're supposed to lose voltage on VCCIN if the LLC doesn't counter vdroop enough. that looks about right.
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