Help needed with folding on a 7950!

[instinct_2k]

I've got two sapphire 7950 in the same rig (x79) both running on a Corsair AX 850 and both running the Dual-X coolers.

Here the problem. If I only fold on both cards (even under clocked on core and memory) the machine reboots showing nothing in either the event viewer or the folding logs.

I monitor their temps very closely, and when both cards are under clocked to 800mhz core and 800mhz memory. The top card is running at about 73 dregs and the bottom at about 63 degs.

I have no idea why it's rebooting - anyone got any bright ideas????
(Complete system specs in my sig)

 

[hmmblah]

If you fold on each card individually it doesn't reboot? Only when 2 cards are folding at the same time, right?

Usually this indicates a power problem, but the AX850 should be more than enough. How long does it fold before it reboots? Is it about the same every time?

Are any other apps giving you this problem? What about benchmarks that stress both cards at the same time?

Have you tried different drivers?

 

[instinct_2k]

Thx for the reply.

I've tried 13.4, 13.9, and the lasted betas. Clean install of the drivers each time!
Currently running the 13.9 drivers as they seem the best of the bunch. (My server has a 7950 in it for folding only and runs 24/7 on 13.9 over locked to 1000mhz core and 1400mhz memmory without a sigle glitch!!)

Need to test if the top card runs fine on its own - will do that tonight!
As far as what time of the day??? Both will fold all day for hours (6 hours plus) but it fails overnight!!!!!

There's no anti virus checks running then and the I have my system update set to manual!!

Keep the questions coming!! I need that top 20 position lol!!!!

 

[hmmblah]

What I meant by time was does the reboot happen right away, does it happen after x amount of hours, is it random?

If you can narrow it down to a specific time that would indicate software or something running and interfering with the F@H client. You said you already check to make sure updates aren't automatic, that's the big one, but if you find it happens at 2AM for example, it could be another piece of software.

 

[instinct_2k]

It seems to happen at random times, they will both run fine for hours and hours!!!

 

[hmmblah]

I'd start by trying each card overnight by itself.

 

[instinct_2k]

Update.

I think I found the problem

The computer is in what I fondly call my "Man Cave". Over night the door is kept shut. Having run hwinfo over night with logging turn on (generated over 8mb of logs) I found that it was the memory that was getting too hot, not the core!!!!

Solution - I have now undervolted the card down to 1.000v (have tried 0.994v) and ran both cards last night. Works perfectly!

Primary card: 1000mhz core, 1400mhz memory @ 1.000v
Secondary card: 1000mhz core, 1400mhz memory @ 1.100v

--------------------------------------

With all three cards folding (don't forget the one in my server) I'm not getting about 260,000 ppd!!!

Just need to start running them 24/7 to I actually get the points!!!!

 

[hmmblah]

Nice find, what kind of temps were they reaching?

 

[stevehat1]

Overclocking the memory usually makes a very small if any improvement in PPD.

I run the core clock as high as possible without the units failing and leave the memory at default. My three Sapphire 7950's are at 1176 to 1180 core and 1225 or default memory. At that OC they are quite solid and make 100 to 107K PPD

 

[hmmblah]

I left the memory alone on my 7950s as well. Cores at 1150.

 

[instinct_2k]

I had no idea the two of you were running 7950s, you must be running a lot of kit to get the numbers you do.

Now I've got thing stable, I'll start playing with the overclock.

Have noticed that the core volt effects the ppd. What sort of volts are you guys running??? And I bet they are all underwater!!!???!

 

[stevehat1]

All of my gear is air cooled, four of the six comps are case less and the two in cases have the side panel removed.

 

[instinct_2k]

I'd hate to see you electricity bill!! Running six machines must cost a fortune!!!!

 

[stevehat1]

Electricity is relatively cheap hear in Oregon as our city has a public utility district. It's far cheaper than privately run utilities

 

[instinct_2k]

Thanks for the help all

Update: Ive been testing various combinations of volts and core clocks (leave the memory at 1250 as suggested)

Just broken 100,000 PPD (according to HFM.net) on one card!!!!

That card's running at:
1100 core
1250 Memory
and 1.200 volts @ 68 degrees