stumped ...
they're not fermi cards so you never used swan_sync and consequently never needed to turn it back off,
no downclocking (PG - while you might be having issues with Linux, Otis's general issue is on Win7),
no announcement on GPUGrid about any changes,
same number of steps per WU ...
it almost looks like they are testing a different molecule branch but that typically has a new "batch" type name,
maybe they are hitting some new parameters in the batch that are just really tough ... doubt that as WUs in a givn batch are usually fairly consistant.
I know a while back GDF bumped the internal thread priority (which I don't know how to check) but I thought that was at the application level and not WU specific
I see you have not jumped to the latest version of BOINC (6.13.xx) which I've read on some projects is causing GPU difficulties
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