#1 - I wouldn't say sensitive its more the fact the logic board is not tunable like an over-clocker board is so going with the ultra-fast RAM is just not possible. This is no different what a standard Compaq or Dell system would be limited to. Basically, the RAS & CAS is locked.
#2 - S/N of the RAM chips is unique per module and has no bearing.
#3 - Just make sure the RAM you get is claimed to be compatible with your system
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#4 - You are limited to the chips Apple used Jumping to the i7 is what I recommend for either a i3 or i5 system other wise it makes little sense to upgrade.
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#4 - You are limited to the chips Apple used Jumping to the i7 is what I recommend for either a i3 or i5 system otherwise it makes little sense to upgrade.
As for your Q's heres a bit more:
#1 - I wouldn't say sensitive its more the fact the logic board is not tunable like an over-clocker board is so going with the ultra-fast RAM is just not possible. This is no different what a standard Compaq or Dell system would be limited to. Basically, the RAS & CAS is locked.
#2 - S/N of the RAM chips is unique per module and has no bearing.
#3 - Just make sure the RAM you get is claimed to be compatible with your system
#4 - You are limited to the chips Apple used Jumping to the i7 is what I recommend for either a i3 or i5 system other wise it makes little sense to upgrade.
I would also go with a SSD if you want some zip!