Two GPUs causes computation errors on one of them.

Author	Message
Mr P Hucker Send message Joined: 5 Jul 11 Posts: 990 Credit: 376,143,149 RAC: 6	Message 51676 - Posted: 12 Nov 2011, 16:44:04 UTC I had an ATI Radeon HD 4850 which ran Milkyway fine. Then I stuck in an ATI Radeon HD 6790 in addition to this card (which I only have for a short while to test, as it is to go in a customer's computer), and Milkyway ran on both GPUs (after I told BOINC to use all GPUs in the cc_config.xml file), but the tasks running on the 6790 caused a computation error immediately on starting. However the tasks running on the 4850 continued to complete successfully. I reinstalled the latest Catalyst drivers with no effect. Then I removed the 4850, and Milkyway runs fine on the 6790 by itself. Any idea what on earth is going on? ID: 51676 · Rating: 0 · rate: / Reply Quote

arkayn Send message Joined: 14 Feb 09 Posts: 999 Credit: 74,932,619 RAC: 0	Message 51683 - Posted: 12 Nov 2011, 23:46:18 UTC The 6790 should not be running the work at all as it does not have double precision math on it. The 3850, 48xx series, 58xx series and 69xx series are the supported AMD/ATI GPU's for this project. ID: 51683 · Rating: 0 · rate: / Reply Quote

Carlos R. Moreira Send message Joined: 12 Sep 11 Posts: 10 Credit: 4,745,303 RAC: 0	Message 51693 - Posted: 14 Nov 2011, 10:08:43 UTC - in response to Message 51683. Last modified: 14 Nov 2011, 10:12:19 UTC 4770 also has DP support... If you have only one card without DP, milkyway will detect and warn you that your board doesn't have necessary support. As you had already a board with DP support and attached another one without, probably server recognize DP support form the 4850 and wasn't able to sort the 6790 out, sending and trying to start jobs for your second board aswell... ID: 51693 · Rating: 0 · rate: / Reply Quote