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Help required! Cuda on new system crashes!

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Gizbar:
Help required please. I'm slowly tearing out what little hair I have left as I can't get Cuda working properly on my new Win 7 system.

I have:- Asus M4A79T deluxe, 4Gb corsair DDR3 ram, AMD955 clocked up to 3.6Ghz at stock voltage, and a 9800GTX+ on Win7-64 bit release candidate, with Lunatics v0.1.

I installed a new GTX260 (a Gigabyte super overclock 896Mb, running at  680Mhz core, 1500Mhz shaders, and 2500Mhz ram). Gigabyte say they cherry-pick the GPU's to run at this speed. I only got it because the EVGA I ordered went out of stock and they agreed to do this one at the same price. It seemed to be working fine, tried a couple of benchmarks but don't have much to hand, until I tried to update to Win7-64 bit Home premium full version, and Lunatics v0.2 64bit.

Started off with a complete blank hdd, and installed all my stuff. Tried to save all my work, as discussed on Seti forum, and thought I'd succeeded. Installed Boinc 6.6.41, which I know now seems to be a bit flaky so uninstalled and put 6.6.38 on there. Installed Lunatic v0.2 and it started processing. Also running Nvidia 191.07, and cuda 2.3 dlls

The problem comes when it tries to hand over one Cuda to another. It finishes one unit, and then freezes the screen completely when trying to take up another. The mouse will move for a while, but none of the buttons on windows will work and then the mouse freezes too. It doesn't fail like this on every work unit, but I can't trust it to leave it be anymore. I proved the theory about the wu handover by following it on SysInternals processxp. I've even used EVGA precision to underclock the card slightly, but it doesn't stop it freezing up.

Sorry for the essay, but I'm trying to give as much information as possible...

Any ideas?

regards, Gizbar.

Raistmer:
Most useful info still missed - link to your host!

Gizbar:
Ok, I can do that, it is host number 5000538.

But I don't know how I can provide you any details of the ones that are failing. (but see below for one example!)

What seems to be happening is when they fail, they go back to the last checkpoint after rebooting, but Boinc is not finishing the work unit off, it's starting a new one from the cache.

One of the failing workunits is this one:-  02se09ab.28065.22971.12.10.166_1 - got to 03:04 and 26.551%

Hope that helps a bit more.

It was running for a few months on Win7-64bit with the 9800GTX+ on Lunatics v0.1

regards, Gizbar.

Raistmer:
If you wanna people help you why not easy their work and provide complete URL to host?

Gizbar:
Ok, here it is.

http://setiathome.berkeley.edu/show_host_detail.php?hostid=5000538

Hope that helps.

Have now tried disabling aero, but no joy.

Running out of ideas because it doesn't seem to be the card. Just had a play with Stalker: Clear Sky just to see if it would crash, but never in the game.

regards, Gizbar.

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