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Broadwell-E thread - Page 223

post #2221 of 7221
I am currently testing cache at 3.6 GHz 1.16 V. Cache is stable for 90 mins in AIDA. However, Realbench crashes in a way where either blender.exe or whole realbench.exe stops working. I am guessing it's still cache related? Upping Vcore does nothing.
post #2222 of 7221
Quote:
Originally Posted by xarot View Post

I am currently testing cache at 3.6 GHz 1.16 V. Cache is stable for 90 mins in AIDA. However, Realbench crashes in a way where either blender.exe or whole realbench.exe stops working. I am guessing it's still cache related? Upping Vcore does nothing.


No need to guess, drop cache multiplier to 35x and try again.
post #2223 of 7221
Quote:
Originally Posted by Silent Scone View Post

No need to guess, drop cache multiplier to 35x and try again.

Well, that is true. Cache instability on my 5960X always resulted in a hard freeze...maybe things have changed.
post #2224 of 7221
Quote:
Originally Posted by xarot View Post

Well, that is true. Cache instability on my 5960X always resulted in a hard freeze...maybe things have changed.

Depends on the level of stability also. Cache instability can manifest in a lot of ways depend on the point of failure. Not excluding fatal exceptions
post #2225 of 7221
Quote:
Originally Posted by Silent Scone View Post

Depends on the level of stability also. Cache instability can manifest in a lot of ways depend on the point of failure. Not excluding fatal exceptions

On Broadwell-E I saw, for me, a real new behavior. The cache is XTU stable up to 3.7G with 1.185V but started gaming all the games had have microstuttering. Didn´t know why and first thought the IMC causes the problem cause of 3200MHz ram.

But all I needed to do was to drop the cache multiplier or adding some voltage. And after picking up some BDW-E I found a good one capable of 4.4G for 24/7 use.

post #2226 of 7221
Quote:
Originally Posted by Silent Scone View Post

Depends on the level of stability also. Cache instability can manifest in a lot of ways depend on the point of failure. Not excluding fatal exceptions
Yep, literally anything - bad data in a CPU is bad. _usually_ if you are "close" you will see corruption in stressapp without any catastrophic failure, but its really a roulette wheel of which bits gets corrupt when...

My current frustration is that some instability I thought might be my OC on the 6950x turns out to be a problem in the ext4 file system and/or the kernel. I moved my code over to my dual xeon system and I'm seeing the same symptom with very large data movement. Move enough data and the ext4 journal deadlocks and stack dumps on the timeout. That explains why I could find no other symptom of OC instability and the failure came at relatively light load (multi-TB copy/rsync).... it wasn't the OC.... bum, bum, bah! ohno-smiley.gif

EDIT: ayup - and it seems no one has any intention of fixing it:
https://bugzilla.redhat.com/show_bug.cgi?id=773377
NEAT!
(disclaimer: not NEAT!)

Sorry, I don't have specific numbers at this point, but some surprising results comparing a dual 2690v4 BW to the 6950x for heavy, multi-threaded computes. Cinebench and other synthetics put a single 2690v4 roughly on par with an OC'd 6950x in many regards, but I'm seeing even limiting tasks to 8-10 cores there are some curious similarities between the much slower (3.2GHz all core turbo 2690v4 vs 4.4GHz 6950x).

Given the slower memory (DDR4 2400 CAS 17 ECC, registered and the hilarity that QPI/dual core introduces there) and slower clock, I really expected the 2690v4 to struggle to impress vs the 6950x for "low" thread count tasks (< 10). Even more so that uncore on the 26xx is VERY slow... <2Ghz - though asus allows override of this, it comes at the expense of the TDP envelope, so something else pays the price (gets TDP throttled).
Edited by cekim - 8/8/16 at 10:28am
post #2227 of 7221
Can someone give me a good overview about what overclocking results i can expect? Like in every other hardwareforum near 99% of all people here have a "golden" chip..... So many people are just lying or benchstable means a 10 sec test with AIDA.

A friend of mine is frustrated with his 6800k. He can only get 4.3 Ghz with 1.33 vcore. Otherwise the PC will constantly reboot with whea logger "Cachehieraryerror" event id 18 or kernel power event id 41. Someone knows what that means?
He just wants to know if he has a good chip or a poor one.

When he looks in this thread he thinks he has the badest chip on earth
post #2228 of 7221
Quote:
Originally Posted by Rammler View Post

Can someone give me a good overview about what overclocking results i can expect? Like in every other hardwareforum near 99% of all people here have a "golden" chip..... So many people are just lying or benchstable means a 10 sec test with AIDA.

A friend of mine is frustrated with his 6800k. He can only get 4.3 Ghz with 1.33 vcore. Otherwise the PC will constantly reboot with whea logger "Cachehieraryerror" event id 18 or kernel power event id 41. Someone knows what that means?
He just wants to know if he has a good chip or a poor one.

When he looks in this thread he thinks he has the badest chip on earth
Chuckle... Don't have a complete run-down for you, but the short version is 4.3@1.33 is entirely normal for BWE at this point. His chip is fine.
post #2229 of 7221
Quote:
Originally Posted by Rammler View Post

Can someone give me a good overview about what overclocking results i can expect? Like in every other hardwareforum near 99% of all people here have a "golden" chip..... So many people are just lying or benchstable means a 10 sec test with AIDA.

A friend of mine is frustrated with his 6800k. He can only get 4.3 Ghz with 1.33 vcore. Otherwise the PC will constantly reboot with whea logger "Cachehieraryerror" event id 18 or kernel power event id 41. Someone knows what that means?
He just wants to know if he has a good chip or a poor one.

When he looks in this thread he thinks he has the badest chip on earth

Stop playing messenger boy and tell him to get in here.
post #2230 of 7221
I have a 6850K running at ~4.4GHz and having a weird problem. During longer gaming sessions (more than half an hour of Witcher 3 for example), the system agent voltage drops by as much as 0.1V and the system either reboots, BSODs or the game crashes. Normally I'm using a voltage of about 0.94V for the system agent (offset of -0.050) and everything is stable, but when it drops by 0.1 to ~0.84 you can guess it, it's not very stable anymore. Anyone come across this problem before?
Broadwell-E
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Broadwell-E
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CPUMotherboardGraphicsRAM
Intel Core i7 6850K Asus X99-A II Gigabyte Aorus 1080 ti Kingston HyperX Fury HX426C15FBK4/32 
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Samsung 950 PRO 512 Samsung UE48HU7500 Corsair RM 750x Fractal Design Define S 
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Logitech G502 
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