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.
At stock speeds our Sapphire Pure Black X58 performs similar to the ASRock for the most part. We do see that L3 Cache write speed is a little down, though. Overclocked, we can see the big performance boost that's offered.