Memory performance
Memory subsystem performance doesn't always track with real-world applications, but it's a good place to start our performance benchmarks

The P5Qs look a little sluggish in this first wave of memory subsystem tests. Asus may want to spend some more time tuning the P45's memory controller to bring the boards up to par with the rest of the pack.

Memory controllers don't always handle four DIMMs gracefully, so we popped an additional two memory modules into each system for another round of tests. In these tests, we had to back off to a 2T command rate for the nForce 780i SLI, Rampage Formula, and DX48BT2—a common adjustment for four-DIMM configurations.

Adding DIMMs doesn't change the performance picture much for the P5Qs; they're still among the slowest in the field.