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Sandy Bridge stability ???

Shetlander

Shetlander

Shetlander

Associate
Joined
12 Jul 2004
Posts
377
Location
Poole Dorset
Im currently working on getting my build Prime95 stable but seem to be finding it impossible. Ive had it as high as 4.7Ghz where it will pass hours of LinX on max settings and Intel burn. Only problem is when I set Prime95 going it runs for a while and then either freezes the computer, BSOD,s or restarts the computer. Its done this after as much as 5 hours and usually in the middle of the night.

Has anyone managed a Prime95 test for 24 hours? Im curious to see if the program has issues with the hardware. I dont see how it could but Im sure I remember something about it happening with a previous new chip.
 
Ive just upgraded my bios to the latest 1203 this morning and when I left for work it was priming using the auto overclock setting to see if the board has it right. Looking at you settings above I may have been a little conservative with the volts. I was running 1.365v in the bios and had it stable running hours of LinX but not passing Prime95. I didnt appreciate it would need such a big increase to pass both. I will test it tonight overnight and see how it goes.
I have also just changed my memory to the faster G Skill 2133Mhz set and moved it into A1 & B1. Fingers crossed it will still be running when I get home.

Come to think of it I wonder if it could be the memory over heating? My new G Skill comes with a RAM cooler so I may give that a try. The airfolow isnt blowing a tornado through it as the CPU/GPU are watercooled so the fans are low for quiet.
 
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Thats some volts for 4.7GHz.

I ran OCCT last night and have a strange problem. On the 12v graph, it shows the voltage as 7v. Also, Everest shows the 12v rail as 7v. Is that an incompatability of the programs or is that likely. I wouldnt think it would run on 7v or it would be very flakey indeed. In the bios it shows as 12.338v. Is there any other progs I can use other than HW monitor as it doesnt show my 12v rail.

On a side note, when I got home last night it had been priming all day with the standard overclock the board set (103 x 42 = 4.326Ghz) and on core 0 and 2 it had failed with a rounding error after 7 hours but the other 2 cores where still going. That was with my G Skill 2133Mhz RAM.
 
I had it running overnight at 4.7Ghz with 1.380v in the Bios. It was all ok when I went to bed but when I got up this morning there was a pop up which stated "Prime95" had stopped redponding". No BSOD, no restart. PC was working as normal. Funny thing is it stopped at 3.18am which Im sure is when its frozen in the past. Im starting to wonder if the heating coming on in the middle of the night is causing a sufficient power drop/surge to unsettle th PC enough to cause a wobble. I set it going this morning so It will be interesting to see if its still going when I get home.
 
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