It's my first post so please be gentle
Recently I have upgraded my GPU to 5870 and moved my old GPU (5770) outside my PC via pcie x1 riser and since then my CPU usage is about 25% for each phoenix (ver. 2.4) (currently running 2). When I try to ran 4 phoenix jobs the CPU usage is 100%. I didn’t have this problem with only one card onboard (1-5% usage per phoenix). Any idea what is the problem and how can I decrease CPU usage? My CPU is Phenom II (550) with 4 cores (2 unblocked).
Win7 32bit, 11.5Catalyst
Thanks for help.