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post #51 of 63
Thread Starter 
I wonder if there is a problem with P95 and Sandy Bridge. I just lowered to 40X and tested with 1.428v and one thread failed. What do you think?
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post #52 of 63
That's the first I've heard of finally just one core failing. I've had two different mobos and two different 2600Ks and when P95 is going to fail, it just BSODs.

Something is amiss here with P95 and the SB. No idea what yet.
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post #53 of 63
Thread Starter 
I wonder now if it is my memory that is causing the problems in P95. I have my memory set at 1866 9 9 9 24 (1) and the specs are 2000 9 10 9 28 (2). I just lowered the memory to 1333 and so far P95 is going well. The funny thing is that at 1866 9 9 9 24 (1) the memory passed Memtest+ all day. But when combining this speed with the CPU there are problems. I will keep testing. Maybe 1866 but everything else on auto is a good start.

Edit:
If memory timings are left on auto then CPU-Z reads the same as I set 9 9 9 24 (1) so maybe I will need to manually set these to 9 10 9 28 (2).
Edited by Kent10 - 1/17/11 at 1:25pm
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post #54 of 63
Quote:
Originally Posted by Kent10 View Post
I wonder now if it is my memory that is causing the problems in P95. I have my memory set at 1866 9 9 9 24 (1) and the specs are 2000 9 10 9 28 (2). I just lowered the memory to 1333 and so far P95 is going well. The funny thing is that at 1866 9 9 9 24 (1) the memory passed Memtest+ all day. But when combining this speed with the CPU there are problems. I will keep testing. Maybe 1866 but everything else on auto is a good start.

Edit:
If memory timings are left on auto then CPU-Z reads the same as I set 9 9 9 24 (1) so maybe I will need to manually set these to 9 10 9 28 (2).
Kent, prime95 will turn out to *not* be the ultimate stability test for SB. Now that's my opinion of course, but I think you are hammering your chip unnecessarily.

http://www.xtremesystems.org/forums/...&postcount=172

The above link finally addresses some of what I have been blabbering about.

Here's what I'm going to do:

1. Lower my vcore
2. Test with Linx on max memory and 3dmark, pcmark, and my 3D application
3. repeat.

My opinion is worth what you paid for it. ;-)
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post #55 of 63
Thread Starter 
Yes that is what it sure seems. Oddly though and this is really just preliminary at this point but I have set my memory timings manually to 9 10 9 28 (2) instead of auto and so far no failed threads. I am going to let it run a little longer to be sure there is a difference. But with the timings on Auto or manually at 9 9 9 24 (1) a thread would fail within a couple minutes even though these timings passed hours of Memtest+.
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My System
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CPUMotherboardGraphicsRAM
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post #56 of 63
Thread Starter 
I found this review of my memory. http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/39511-g-skill-ripjaws-f3-16000cl9d-8gbrm-2x4gb-memory-review-2.html

It mentions that the specs are not the same as the timings picked up in CPU-Z. I don’t understand it all yet but from what I can gather, my BIOS was reading 9 9 9 24 (1) on auto when the actual specs are 9 10 9 28 (2) so even when I put my memory in auto it was over clocked on some of those timings. This may be causing the problems for me. Still I don’t know why it passed Memtest+ then but it doesn't pass P95. I am testing 47X again but with memory timings manually set to spec and so far no failed threads. Maybe I am on to something smile.gif I may have to go backwards now and try some of my tests again but for now I am staying with LLC on level 2 and lower BIOS Vcore rather than LLC Level 1 with higher BIOS Vcore. CPU-Z is showing 1.44v which may be a little high. Temps are maxing at 71. P95 has run for an hour with no failed threads.

I also changed the BCLK incrementally so I would have 4701 MHz.
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My System
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CPUMotherboardGraphicsRAM
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post #57 of 63
Thread Starter 
Double Post Deleted
Edited by Kent10 - 1/17/11 at 3:46pm
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i-7-2600K at 4701 MHz Gigabyte P67A-UD7-B3 MSI N460GTX Cyclone 768D5/OC G.Skill Ripjaws 2X4GB DDR3 2000 
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post #58 of 63
Thread Starter 
Update:

Success!! I am 24 hours and 5 mins P95 stable at 4701 MHz. The problem was my RAM timings. With my RAM timings set manually to the specs I didn't receive any P95 errors and by increasing the Vcore little by little I was able to finally hit 24 hours in P95. I sure was nervous though as it approached the end.

I ended up with 1.46v set in the BIOS but 1.416v in CPU-Z under load. Is this the voltage that everyone reports, ie the one under load? This is with LLC on Level 1. Temps averaged around the 60 degree mark from what I could see with the highest 68 on one core.

Thanks to everyone for your help. I really appreciate it!
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i-7-2600K at 4701 MHz Gigabyte P67A-UD7-B3 MSI N460GTX Cyclone 768D5/OC G.Skill Ripjaws 2X4GB DDR3 2000 
Hard DriveOSPowerCase
Intel 120GB X25-M G2 SSD | Hitachi 3TB 7K3000 Windows 7 Ultimate 64 Bit Corsair AX850 Cooler Master HAF X 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i-7-2600K at 4701 MHz Gigabyte P67A-UD7-B3 MSI N460GTX Cyclone 768D5/OC G.Skill Ripjaws 2X4GB DDR3 2000 
Hard DriveOSPowerCase
Intel 120GB X25-M G2 SSD | Hitachi 3TB 7K3000 Windows 7 Ultimate 64 Bit Corsair AX850 Cooler Master HAF X 
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post #59 of 63
Very nice Kent10.

Depending on the board, some people report the lower voltage they see.
post #60 of 63
Quote:
Originally Posted by Kent10 View Post
Update:

Success!! I am 24 hours and 5 mins P95 stable at 4701 MHz. The problem was my RAM timings. With my RAM timings set manually to the specs I didn't receive any P95 errors and by increasing the Vcore little by little I was able to finally hit 24 hours in P95. I sure was nervous though as it approached the end.

I ended up with 1.46v set in the BIOS but 1.416v in CPU-Z under load. Is this the voltage that everyone reports, ie the one under load? This is with LLC on Level 1. Temps averaged around the 60 degree mark from what I could see with the highest 68 on one core.

Thanks to everyone for your help. I really appreciate it!
Lol i didn't see this thread as I have been really busy. Any input for my guide?
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X99 Main Rig
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