I have both a 5870 and a 5450 card in my PC. Since I added the 2nd card boinc has been running 2 MW WU's at a time, thinking both are getting 100% of a GPU; the fact that their runtimes move in lockstep with each other and are 2x as high makes it clear that they're both running on my 5870. Is there any way I can apply a cluebat to the system to straiten it out?

I have both a 5870 and a 5450 card in my PC. Since I added the 2nd card boinc has been running 2 MW WU's at a time, thinking both are getting 100% of a GPU; the fact that their runtimes move in lockstep with each other and are 2x as high makes it clear that they're both running on my 5870. Is there any way I can apply a cluebat to the system to straiten it out?

I presume you have yet to place the cc_config file in the folder containing the folder with all the projects?

This file tells BOINC to make use of all the available GPUs on your system that are compatible with the project(s) you want to run.

The cc_config file would look something like this -

<cc_config>
<options>
<use_all_gpus>1,/use_all_gpus>
</options>
</cc_config>

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Go away, I was asleep

What is it you want to achieve - run only one WU at a time?
The 5450 won't get any MW work whatever you do, according to the GPU Requirements.

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I know the 5450 won't run MW, so 1 at a time would be my default objective so they're not competing with each other for hardware resources.

I'd like to know where the bug is though so I can report it to the correct people. My account lists my computer as having 2 5800 series cards not one 58xx and one 54xx; is this an MW problem or a problem with the boinc client.

http://milkyway.cs.rpi.edu/milkyway/hosts_user.php

I should add that I'm assuming that resource conflicts will result in 2 WU's running concurrently taking slightly longer to complete than the same 2 WU's running sequentially. IF this isn't the case other than looking stupid I suppose it's not a major problem,

Seems like the science app is somewhat more enlightened than the BOINC core client:

instructed by BOINC client to use device 1
Found 2 CAL devices
Device 0: ATI Radeon HD5800 series (Cypress)
Device 1: ATI Radeon HD5400 series (Cedar) ... not supporting double precision
Device 1 not available or not supported.
Trying to reassign the WU to another device.
0 WUs already running on GPU 0
Starting WU on GPU 0
(shortened)

My guess is that BOINC only detects the number of CAL devices and the type of the first one, then giving instructions that the science app must correct. I think a cc_config file can limit BOINC to use only one GPU, but I'm no expert there (have never used one).

On the other hand the 5870 is more than capable of running two WUs simultaneously. (If you get them slightly staggered in time after a while, it's actually beneficial because it will keep the GPU busy when it would otherwise be "between WUs".)

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Help me please.
My tasks by project MilkyWay are too big - I am afraid that I will not finish tasks before my deadline. (My PC works almost all day). How can I download smaller tasks?
Thank you