Intel Skylake / Kaby Lake

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Abwx

Lifer
Apr 2, 2011
11,543
4,327
136
IGPU maybe? Just like AMD APU.?

LOL, some desperate FUD....


How would you suggest using it?

Only at stock frequency for the most punishing tests.

When overclocking FFT sizes bigger than 512K and only half an hour at most, and if possible PC plugged on a Killawatt.

More is just torturing the CPU uselessly as the point is not to find the limit at wich it will break, but to check stability under extreme conditions that are never realised with real softs for durations longer than a few ms, actualy this amount to push the CPU close to its peak TDP constantly..
 

Deders

Platinum Member
Oct 14, 2012
2,401
1
91
LOL, some desperate FUD....




Only at stock frequency for the most punishing tests.

When overclocking FFT sizes bigger than 512K and only half an hour at most, and if possible PC plugged on a Killawatt.

More is just torturing the CPU uselessly as the point is not to find the limit at wich it will break, but to check stability under extreme conditions that are never realised with real softs for durations longer than a few ms, actualy this amount to push the CPU close to its peak TDP constantly..

Exactly why people would consider it unsafe when overvolted as they tend to leave it running for many hours when stress testing overclocks.
 

Essence_of_War

Platinum Member
Feb 21, 2013
2,650
4
81
The real world load would most likely be a variety of tasks, not just ones that would all fit in the cache.

Right, that's all I'm trying to say. That sitting around doing small FFTs that fit into L2 cache w/ mandatory overvolted AVX instructions is a power virus scenario.

Even so it has been agreed even for haswell that modern AVX and FMA load are bad for the cpu WHEN OVERCLOCKED. These loads require increased voltage which might be ok at stock but are really punishing when overvolted. Especially with auto volts.

I don't think anyone has agreed that it is bad for the CPU to be hit with AVX/FMA instructions.

It's just useful to be aware that if you're overvolting as part of an overclock, utilizing AVX/FMA instructions will apply an additional overvolt, and that could produce more heat than you expected, especially in workloads that are designed to fit into L2 cache.
 

nvgpu

Senior member
Sep 12, 2014
629
202
81
Anandtech said:
The first one is the absence of full hardware acceleration for HEVC Main10 decode. Netflix has opted to go with HEVC Main10 for its 4K streams. When Netflix finally enables 4K streaming on PCs, Skylake, unfortunately is not going to be the power efficient platform that it could have been. The second is the absence of a native HDMI 2.0 / HDCP 2.2 video output. Even though a LSPCon solution is suggested by Intel, it undoubtedly increases the system cost. Sinks supporting this standard have become quite affordable. For less than $600, one can get a 4K Hisense TV with HDMI 2.0 / HDCP 2.2 capability. Unfortunately, Skylake is not going to deliver the most cost-effective platform to utilize the full capabilities of such a display.

Wonder if Intel will get it right in Kaby Lake or Cannonlake.
 

Abwx

Lifer
Apr 2, 2011
11,543
4,327
136
Exactly why people would consider it unsafe when overvolted as they tend to leave it running for many hours when stress testing overclocks.

That s doable but one has to consider the technology, what could be done with an SB, or moreover by an FX, cant be done at 14nm as thermal density is well over the chips i mentioned.

Not counting the GPU a SB is at 0.45W/mm2 for 100W dissipation, a FX is at 0.32W/mm2 while a SKL is at 0.8W/mm2, that s actualy twice the stress at equal power.
 
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Dave2150

Senior member
Jan 20, 2015
639
178
116

These were just rumours ahead of the launch. None of the Asus Z170 boards have an OC Socket, check the product pages for each board, no oc socket documentation to be found.

Edit - confirmation of no OC Socket on LGA1151 on any Asus boards: https://rog.asus.com/forum/showthread.php?73945-Maximus-VIII-uses-LGA-1151-OC&p=527005&viewfull=1#post527005

Raja@Asus said:
No OC socket plans for M8 series - we tried it, no help for OC on this platform, so boards will be without. Even if it were there, Intel removing the pins or not would cause no difference to the board working. Intel won't remove said pins anyway as they need them.
 
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yacoub

Golden Member
May 24, 2005
1,991
14
81
So when does Skylake actually hit retail/e-tail in the US? It's been a dead launch so far.
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
16,360
4,067
75
In stress test mode it is a power virus for the FPUs.

Stress-test mode is not the same as the usual DC app operation.

Stress-test mode is actually fairly similar to the usual Prime95 DC app, and even more similar to the usual operation of PrimeGrid (see my sig).

I've been planning to get a Skylake and do a lot of this kind of computing on it. :\ Though I'd be a lot more careful overclocking it, if I did at all.
 

Edrick

Golden Member
Feb 18, 2010
1,939
230
106
To quote Raja the Asus rep on overclockers...

"Prime95 is not a good stress test for Skylake. It will pass up to 0.07Vcore lower than a Handbrake encode. On top of that, Prime generates more current draw than any other application, so it is possible to degrade a CPU with it (if used foolishly) on most platforms."​

Well, that's his opinion I guess. But he is incorrect about Prime95 generating more current draw than any other application. Fully optimized linpack code will draw more for example.

I use Prime95 and Linpack as a stress test on all my CPUs (Skylake included). If I can run those stable (for a short duration), then I can run anything stable.

Aida64 is a great utility, and I have owned it for quite some time now, but its stress test is very tame in comparison.
 

Pandamonia

Senior member
Jun 13, 2013
433
49
91
10 passes of realbench and your stable. i dont rate prime95 any more. 24 hour stress testing is pointless.

With real bench id BSOD within minutes if i wasnt stable. Never crashed since i passed 10 times.
 
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