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mmomega

macrumors demi-god
Dec 30, 2009
3,888
2,101
DFW, TX
Just picked up a '12 MBA 13" with 4GB RAM a few hours ago and had to put ML on it myself, it wasn't already updated (weird) and it runs smooth, like another poster put it, like buttah.

I could also say that my '10 MBA 13" with 2GB RAM runs quite smooth itself.
 

Macman45

macrumors G5
Jul 29, 2011
13,197
135
Somewhere Back In The Long Ago
My MBA 13" runs it fine, but that's SSD land. I upgraded my MBP 17" to 8GB shortly after I bought it (It was on Lion then) and It runs ML fine. I think if you can go to 8GN you are going to be better off.
 

whoknows87

macrumors 6502a
Aug 8, 2012
676
31
S.Florida
I have a mid 2009 MBP 2.53 Ghz 4GB Ram after upgrading to ML , 3 days to be exact my laptop experienced some serious issues, apple diagnosed it as HD failure ( NOT) then said Logic Board ( NOT) , it was the Hard drive Cable
i had 250 GB that I've only used 90 GB pretty casual user, I was told the upgrade probably stressed the MBP how? they failed to tell me, anyways after getting that issue sorted out , I upgraded the RAM to 8 and this MBP is going pretty sold, I did notice a difference a lot smoother with 8GB running mountain lion
 
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