Sahkuhnder
Delusions of grandeur
It's one of the dx11 5800 series cards so may be worth it, although having done a bit of reading it sounds like that it will slow the SMP folding. From what I read it seems that the clients dom't get the best out of ATI cards and they return a lower ppd than an equivalent nvidia so as you say it may be points loss for me.
The current ATI client is definitely a lower points producer than the Nvidia clients are, but that doesn't mean it isn't well worth running in certain situations like with AGP cards for example. You can try the ATI client if you like but I agree with you and suspect you will have a net points loss by doing so. The newer ATI client should be out soon and it will be easier to configure with no need for the environmental variables that the current ATI client uses.
BTW, very nice system you have there.