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post #871 of 7221
Quote:
Originally Posted by cekim View Post

I would agree, I had trouble my first day or so with a 6950x, but eventually found the IMC to be better than Haswell. Running 3000CAS14 128G. I am able to run "stable" at 3200CAS14 (ran for 10+ days like that), but stressapp would eventually show temperature dependent single bit corruption. So, I dialed it back to 3000. The RAM was not "overheating", just as it got hot under stress, it could take the OC.

Overall the 6950x @ 4.4/3.7 (CPU/Cache) has been extremely stable, runs cool, spins up from idle faster, but with a few notable exceptions gives me performance VERY similar in raw compute terms as my 5960x @ 4.7/4.2.

Active airflow and perhaps not testing for stupendous amounts of time would be my advice.
post #872 of 7221
Quote:
Originally Posted by Silent Scone View Post

Active airflow and perhaps not testing for stupendous amounts of time would be my advice.
Airflow already handled, the run-time is "work-work" not benching/stressing. Once I got it stable, I put it to work.

I would periodically re-run stressapp to check for memory issues. Re-reading my post, I can see how that looks like I ran stressapp for 10 days...
Edited by cekim - 6/29/16 at 4:00pm
post #873 of 7221
Quote:
Originally Posted by cekim View Post

I would agree, I had trouble my first day or so with a 6950x, but eventually found the IMC to be better than Haswell. Running 3000CAS14 128G. I am able to run "stable" at 3200CAS14 (ran for 10+ days like that), but stressapp would eventually show temperature dependent single bit corruption. So, I dialed it back to 3000. The RAM was not "overheating", just as it got hot under stress, it could take the OC.

Overall the 6950x @ 4.4/3.7 (CPU/Cache) has been extremely stable, runs cool, spins up from idle faster, but with a few notable exceptions gives me performance VERY similar in raw compute terms as my 5960x @ 4.7/4.2.

Would you mind posting your AIDA64 stress test and Prime95 load temps so I have a reference to go against for my own thermal issues? Whats your cooling set up? Memory speed/timings at that clock speed?
    
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post #874 of 7221
Quote:
Originally Posted by cekim View Post

I would agree, I had trouble my first day or so with a 6950x, but eventually found the IMC to be better than Haswell. Running 3000CAS14 128G. I am able to run "stable" at 3200CAS14 (ran for 10+ days like that), but stressapp would eventually show temperature dependent single bit corruption. So, I dialed it back to 3000. The RAM was not "overheating", just as it got hot under stress, it could take the OC.

Overall the 6950x @ 4.4/3.7 (CPU/Cache) has been extremely stable, runs cool, spins up from idle faster, but with a few notable exceptions gives me performance VERY similar in raw compute terms as my 5960x @ 4.7/4.2.


I assume when you say similar performance between 4.4/3.7 6950X and 4.7/4.2 5960X that you mean without considering the extra 2 cores on the 6950X right? As 10 cores would obviously increase the overall compute performance of it, so i'm assuming you mean with only 8 cores active on both right?
 
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post #875 of 7221
Quote:
Originally Posted by cekim View Post

I would agree, I had trouble my first day or so with a 6950x, but eventually found the IMC to be better than Haswell. Running 3000CAS14 128G. I am able to run "stable" at 3200CAS14 (ran for 10+ days like that), but stressapp would eventually show temperature dependent single bit corruption. So, I dialed it back to 3000. The RAM was not "overheating", just as it got hot under stress, it could take the OC.

Overall the 6950x @ 4.4/3.7 (CPU/Cache) has been extremely stable, runs cool, spins up from idle faster, but with a few notable exceptions gives me performance VERY similar in raw compute terms as my 5960x @ 4.7/4.2.

thumb.gif

same conclusion here. The 6950X @ 4.4/3.8 does blow past my 5960x (still on-the-job at 4.7/4.2) in any threaded benchmark like 3D mark Physics and the like. thumb.gif
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post #876 of 7221
Quote:
Originally Posted by vibraslap View Post

Would you mind posting your AIDA64 stress test and Prime95 load temps so I have a reference to go against for my own thermal issues? Whats your cooling set up? Memory speed/timings at that clock speed?
Not easy to do quickly, I'm back into linux. Cooling is an EK full-board block for the Rampage 5 Extreme with a 420 + 240 rad (loop includes 2 video cards as well).

Aida64 Temps from memory and from seeing it fully loaded in linux:
peak is 70-72C
Average is 60-65C

I don't run Prime95, if Aida and RealBench pass, I move on to linux, starting with stressapp which usually requires a little more cache/dram voltage somewhere than aida and then on to my personal work-load examples.

4.4CPU 1.325v adaptive
3.7Cache 1.290v (offset)
SA=-0.06V offset (yes, minus, Auto was driving this up higher than needed)
LLC=5
BCLK=100
DDR4 128G 3000-14-14-14-34-2T 1.35v (sticker values for this ram - which Haswell could never do with these same sticks on this same board)
Edited by cekim - 6/29/16 at 5:50pm
post #877 of 7221
Quote:
Originally Posted by DarkIdeals View Post

I assume when you say similar performance between 4.4/3.7 6950X and 4.7/4.2 5960X that you mean without considering the extra 2 cores on the 6950X right? As 10 cores would obviously increase the overall compute performance of it, so i'm assuming you mean with only 8 cores active on both right?
You have to have a work-load that can specifically use these extra 2 cores... (which I do), so yes and no...

The yes is that if your work-load scales well, then its 1:1 and a 6900x and an an above average OC'd 5960x should be nearly identical with the 6950x beating them both. I do have examples of that that I use and I see ~18-20% speed up you'd expect with 2 more cores and imperfect scaling owing to shared resources.

The no is that things like RealBench's image editing and encoding seem to produce very similar numbers between a 4.4 6950x. The OC I lost gets made up by IPC and 2 more cores it seems when more typical imperfect scaling that you see normally is considered.
Edited by cekim - 6/29/16 at 5:45pm
post #878 of 7221
Quote:
Originally Posted by cekim View Post

You have to have a work-load that can specifically use these extra 2 cores... (which I do), so yes and no...

The yes is that if your work-load scales well, then its 1:1 and a 6900x and an an above average OC'd 5960x should be nearly identical with the 6950x beating them both. I do have examples of that that I use and I see ~18-20% speed up you'd expect with 2 more cores and imperfect scaling owing to shared resources.

The no is that things like RealBench's image editing and encoding seem to produce very similar numbers between a 4.4 6950x. The OC I lost gets made up by IPC and 2 more cores it seems when more typical imperfect scaling that you see normally is considered.


I just got my siliconlottery binned (4.4ghz) i7 6800K and i'm curious of how it will compare to my 4.5ghz + 4.3 cache 5960X overall. I'm mostly also just curious of how broadwell-E's extra IPC makes it fare against Haswell-E in general.

My reasoning behind getting the 6800K was that a 4.4ghz 6800K SHOULD be able to hit the same level of multi-threaded performance as a STOCK speed 5960X in rendering and such (which is good enough for me as i've had my 5960X at stock for some time and it renders just fine speed-wise for me) but while also getting me closer to the 6700K in single threaded and gaming etc.. performance due to the IPC increase. But it's hard to find objective info on exactly HOW much of an improvement BW-E is over HW-E clock for clock with identical core count, let alone comparing different core counts...
 
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post #879 of 7221
Quote:
Originally Posted by DarkIdeals View Post

I just got my siliconlottery binned (4.4ghz) i7 6800K and i'm curious of how it will compare to my 4.5ghz + 4.3 cache 5960X overall. I'm mostly also just curious of how broadwell-E's extra IPC makes it fare against Haswell-E in general.

My reasoning behind getting the 6800K was that a 4.4ghz 6800K SHOULD be able to hit the same level of multi-threaded performance as a STOCK speed 5960X in rendering and such (which is good enough for me as i've had my 5960X at stock for some time and it renders just fine speed-wise for me) but while also getting me closer to the 6700K in single threaded and gaming etc.. performance due to the IPC increase. But it's hard to find objective info on exactly HOW much of an improvement BW-E is over HW-E clock for clock with identical core count, let alone comparing different core counts...
Indeed... Intel obviously focused on specific instructions and work-loads that it improved... So, you really have to try stuff to know.

Out of curiosity when I got it, I did things like this:
Code:
// compile with g++ -O3 for_loop.cc -o for_loop
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>

int main(void)
{
    volatile uint64_t a=1,b=1,c=1;   
    for(uint64_t i=0;i<10000000000ull;i++) {
        a = (a + b * c)*i;
        c = a + b;
        b = c + a;        
    }
    printf("a %llu b %llu c %llu\n",a,b,c);
    exit(0);
}

5960x @ 4.4/4.0 (didn't do the 4.7 machine, but this sort of work load is 1:1 linear)
time ./for_loop
a 14112393696577847627 b 9059408354752924673 c 13393758731884628662
61.686u 0.004s 1:01.75 99.8% 0+0k 0+0io 0pf+0w

6950x @ 4.4/3.7
time ./for_loop
a 14112393696577847627 b 9059408354752924673 c 13393758731884628662
54.818u 0.001s 0:54.87 99.8% 0+0k 24+0io 0pf+0w
Edited by cekim - 6/29/16 at 6:30pm
post #880 of 7221
Quote:
Originally Posted by cekim View Post

Indeed... Intel obviously focused on specific instructions and work-loads that it improved... So, you really have to try stuff to know.

Out of curiosity when I got it, I did things like this:
Code:
// compile with g++ -O3 for_loop.cc -o for_loop
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>

int main(void)
{
    volatile uint64_t a=1,b=1,c=1;   
    for(uint64_t i=0;i<10000000000ull;i++) {
        a = (a + b * c)*i;
        c = a + b;
        b = c + a;        
    }
    printf("a %llu b %llu c %llu\n",a,b,c);
    exit(0);
}

5960x @ 4.4/4.0 (didn't do the 4.7 machine, but this sort of work load is 1:1 linear)
time ./for_loop
a 14112393696577847627 b 9059408354752924673 c 13393758731884628662
61.686u 0.004s 1:01.75 99.8% 0+0k 0+0io 0pf+0w

6950x @ 4.4/3.7
time ./for_loop
a 14112393696577847627 b 9059408354752924673 c 13393758731884628662
54.818u 0.001s 0:54.87 99.8% 0+0k 24+0io 0pf+0w


Do you think you could run the test with just 6 or 8 cores active on the 6950X at 4.4 / 3.7 speed? That would give a better idea of how it compares to an equivalent core count or higher core count Haswell-E chip.
 
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