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  #11  
Old 06-22-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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I don't believe you, send me your X299 gear so I can see first hand.

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whats LOD?
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  #12  
Old 06-23-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by elmor View Post
It was, but still get the same after enabling it.
//Pieter update on Elmor test//

RDSEED not supported was on early 12c. Works on 7900X.

Single Precision - Add/subtract

AVX128 = 1.00x
AVX256 = 1.84x
AVX512 = 3.51x
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Last edited by Massman; 06-23-2017 at 14:27.
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  #13  
Old 06-23-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by Massman View Post
//Pieter update on Elmor test//

RDSEED not supported was on early 12c. Works on 7900X.

Single Precision - Add/subtract

AVX128 = 1.00x
AVX256 = 1.84x
AVX512 = 3.51x
That's good to see! Full output?

Though I'm seeing rumors that the integer throughput will not be doubled. And I can see architecturally why that might be. Unfortunately I don't have a benchmark for that.
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Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

Here is my testing, how many Gflops? All the Gflops

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Will test the 6c on Monday.
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Last edited by l0ud_sil3nc3; 06-24-2017 at 01:16.
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  #15  
Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by l0ud_sil3nc3 View Post
Here is my testing, how many Gflops? All the Gflops

Imgur: The most awesome images on the Internet





Will test the 6c on Monday.
Wow! Over 1 TFlops for double-precision!

CPUz doesn't seem accurate in that screenshot. But based on the numbers it looks like you were clocked around 4.5 GHz? Possibly in 100 x 45 configuration?

And it didn't melt?
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Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by Mysticial View Post
Wow! Over 1 TFlops for double-precision!

CPUz doesn't seem accurate in that screenshot. But based on the numbers it looks like you were clocked around 4.5 GHz? Possibly in 100 x 45 configuration?

And it didn't melt?

4.5Ghz (45x100) on the dot, 1.2vcore with a Corsair H110i AIO.

Will try with my good ram on Monday I forgot them at the house and see if it scales at all.

Mesh was at 2.8Ghz for the above screenie.
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  #17  
Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by l0ud_sil3nc3 View Post
4.5Ghz (45x100) on the dot, 1.2vcore with a Corsair H110i AIO.

Will try with my good ram on Monday I forgot them at the house and see if it scales at all.

Mesh was at 3Ghz for the above screenie.
Ram will have no effect on that benchmark. The benchmark is 100% CPU.

I was able to calculate your clock speed because the benchmark achieves very close to the theoretical FLOPs on the system.

For the Core i9 7900X assuming full-throughput AVX512:

(2 FMA/cycle for full-throughput AVX512) * (2 Flops/FMA) * (8 DP/instruction for AVX512) * (10 cores) * (4.5 GHz) = 1440 GFlops

The benchmark is showing 1443.84 GFlops. It's actually slightly more than the theoretical limit because of timing variations.
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Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by Mysticial View Post
Ram will have no effect on that benchmark. The benchmark is 100% CPU.

I was able to calculate your clock speed because the benchmark achieves very close to the theoretical FLOPs on the system.

For the Core i9 7900X assuming full-throughput AVX512:

(2 FMA/cycle for full-throughput AVX512) * (2 Flops/FMA) * (8 DP/instruction for AVX512) * (10 cores) * (4.5 GHz) = 1440 GFlops

The benchmark is showing 1443.84 GFlops. It's actually slightly more than the theoretical limit because of timing variations.

You're in luck I'm staying late just popped in the 6c for science bro

Results incoming?

Not sure if there's an 8c laying around here. . . .
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  #19  
Old 06-24-2017
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Default Re: A Favor to Ask: Skylake X and AVX512

6c results 4.5 (45x100) 1.2vcore:

Imgur: The most awesome images on the Internet

No 8c in office atm
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  #20  
Old 06-24-2017
Mysticial Mysticial is offline
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Default Re: A Favor to Ask: Skylake X and AVX512

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Originally Posted by l0ud_sil3nc3 View Post
6c results 4.5 (45x100) 1.2vcore:

Imgur: The most awesome images on the Internet

No 8c in office atm
Now THAT's interesting... They also show full-throughput AVX512. That's contrary to what all the articles out there are reporting.

(2 FMA/cycle for full-throughput AVX512) * (2 Flops/FMA) * (8 DP/instruction for AVX512) * (6 cores) * (4.5 GHz) = 864 GFlops

Benchmark shows 872.832 GFlops.

If they were only half-throughput, I'd have expected:

(1 FMA/cycle for full-throughput AVX512) * (2 Flops/FMA) * (8 DP/instruction for AVX512) * (6 cores) * (4.5 GHz) = 432 GFlops

Thanks for running all these benchmarks!
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