If I get a 5850 and put it in the same rig as my 6990, would my 1kw PSU support them both mining? I know with the setup I have the 6990 the max load would be around 800W give or take. If the 5850 uses 150w at full, it'd be around 950w load on my PSU which should work but is it safe?
O.o
800W for a single 6990 system? What the hell have you got, a cuisinard? /spaceballs
Seriously though what do you have in there? A single 6990 has a TDP ~400W - you should be able to run
two in a 1KW envelope.