Underclocked RAM better or worse than original clockspeed

[Astroboy907]

I am trying to get some 8gb 1066 mhz RAM to max out my MBP. I have a $50 gift card at B and H, so I was going to order RAM from them. I see that I can get 1600 mHz RAM for $10-15 less than 1066 mHz RAM. Will there be problems using a higher RAM speed? Will it create performance issues? Would it be slower using 1600 mhz rather than 1066 mhz? Please advise. -A907

 

[mikeo007]

I have read about some problems with MPBs running faster RAM than the motherboard supports. The RAM speed should just fall back to the motherboard's maximum, but I know there have been problems reported in the past.

 

[416049]

I am trying to get some 8gb 1066 mhz RAM to max out my MBP. I have a $50 gift card at B and H, so I was going to order RAM from them. I see that I can get 1600 mHz RAM for $10-15 less than 1066 mHz RAM. Will there be problems using a higher RAM speed? Will it create performance issues? Would it be slower using 1600 mhz rather than 1066 mhz? Please advise. -A907

https://discussions.apple.com/thread/3333325?start=0&tstart=0

I wouldn't use faster ram as it either won't work or will limit down to 1066 anyways as your bus is slower than your ram.