Any pros and cons about this performance wise?

Daveo

If you are running a 64-bit OS with say 8GB RAM, I don't think that MHM would offer any performance gain.

My chipset does not support MHM so I can't run any tests to see if it helps.

Something like Fancy Cache or similar might give equally as good results.

Great question

pH

Seems like disabling MHR helped with my ntdll.dll errors. It was like a last resort try that so far has some positive results.

I'm running W7 64 Pro w/8Gigs.