Replacing Everest in our labs is AIDA64. This new testing suite is from the core development team from Lavalys and continues that tradition. The guys have thrown in better support for multithreaded CPUs as well as full 64 bit support. We use this to test memory and HDDs for now, but may find ourselves opening this up to other areas of the motherboard.
Looking at our AIDA64 CPU benchmarks, you can see that performance between the 890FX and 990FX is similar with the 990FX coming out a little ahead in L3 Cache Read speeds. Overclocked, though, you can see a nice boost in performance in both our write and read tests.