Why're you talking about the memory controller on the E8500 then?
Be specific — what do you mean by "faster"? Higher clock speed? Or higher transfer bandwidth?
AMD's memory bus on their newer (Athlon II/Phenom II) processors have a higher theoretical maximum bandwidth than the Intel® 82P45 Memory Controller Hub (used on the P45 chipset). But the actual bandwidth available is often far lower than these numbers, and also depends on the speed of the DIMMs used.
Here's a synthetic Sisoft benchmark comparing some Phenom II and Core 2 memory bandwidths (too bad I couldn't find comparable Athlon II numbers):

And the corresponding latencies:
Source: TechReport's review of the Phenom II X4 955Not that this is any relevant since Windows doesn't explain how they do their WEI testing. It is naive to assume it is based solely on clock speed or transfer bandwidth.