OBSERVATION

I have 2 computers with 5970s in them. With the change of wu size based on speed and number of GPUs etc I took at look at my computers on the project. 1 5970 was getting BIG wu that had an even number of packets. The other 5970 was getting 3 packet wus (small size). Running 100% of the odd number wu was killing the throughput.

The machine that was working correctly is running CAT 11.5 and the one getting the wrong wu was running CAT 10.10. I changed out the driver to 11.3, detached/reattached and it is now getting the BIG wu with an even number of packets.

So, unless there was some strange glitch the driver may matter.