The SMP Client is Still in BETA phases, so its still Unstable at times.
For example, I had to downclock from 3.41 Ghz to 3.204 Ghz because the client was so intense it was like running a stress test all the time. (Therefore Bluescreens and restarts where common place)
I should mention that with the SMP client, there will be 4 instances of fahcore_al.exe Running, each taking about 20-25% CPU time, 2 Smpd.exes and one maybe 2 mpiexec.exes. All Playing some role in the folding process.
It usually takes about the same time it takes a normal WU from the older console version. 23 hours sometimes a little more. The WU's are Much larger and worth alot more points.
If the WU I am on now stays the average it will take 21.6 Hours to complete. But it will be worth at least 1500 points. Many times more than the regular console WU's.
Its well worth it. Of course its even more worth it if you Use Linux and Vmware to use the linux version of the SMP Client. Which is far more stable than the windows version.
You could follow this guide for that if you wanted.
Boost Your Points Folding with VMware, x64 Ubuntu and the SMP Client - PlanetAMD64
I just haven't gotten around to doing it..