Please be aware that not all WUs have the same length. You can judge this by the credit each WU claims, currently it can be 2478, 2882, 2960, 3098 and maybe even other ones. The more credit they claim the longer they take to run. Your two examples on the Vista machine belong to the 3098 family and therefore do take longer, perfectly normal.

To better compare both OS you can look at the timestep/s for similar WU or even better for the same WU.

Kind regards

Alain

You can answer to your question by yourself. All you need is to plug in an additional HDD (for convenience only) and install the best OS Bill Gates ever sold (I mean XP pro, BTW ;-)) on it, and then run a couple of WUs. Of cource, XP need to obtain all latest updates and kosher display driver.

p.s. I hope that your 260s are not combined in SLI mode? :-)

also, to check between OS's, remove one of the 260s from the vista box and see if the performance for one card improves.

here's one of the offending WU's... you can see it polling the Cards in the result text

http://www.gpugrid.net/result.php?resultid=520726

here's one of your Vista WU's (it tke the same time as mine, aound 30k seconds

http://www.gpugrid.net/result.php?resultid=508358

here's one of I'mcrazy's XP WU's

http://www.gpugrid.net/result.php?resultid=521745

around 22k seconds

and my XP box.

http://www.gpugrid.net/result.php?resultid=523590

again around 22k seconds...

April 8, 2009
There might be some downtime this afternoon as we should be meeting with labstaff to get the MilkywayGPU@Home project up and running. I'll also be posting CPU code for the GPU application this afternoon so the people who have made the GPU application for the ATI cards can get their hands on it and modify it so it works with ATI cards. We should have the CUDA code out sometime this week.