upgrade of RAM (or swap?)

Three MacBook to upgrade several Rams (or swap) - all of our children, who have dumped their old MacBook for us and we poor parents just want to make use of the best of them as servers at home. Just need to run it by you to ensure that what I learned from reading internet messages is valid! Thank you very much.

#1) MacBook Pro 13 ", mid-2000, MacBookPro7, 1 4 GB Core 2 Duo - 2.4 GHz, El Capitan
(#2) MacBook - 13 ", MacBook3, 1 2 GB Core 2 Duo 2.2 GHz, OSx10.5.8
(#3) MacBook - 13 ", MacBook1, 1 512 Mo Core Duo 1.83 GHz, OSx10.4.11

Even if change the boot disks can also improve performance, I'm not considering it now, because I don't know how to do it again. Evolution of the chipsets are easier for me.

Issues related to the:

(A) does make sense to buy a set of 8 GB of RAM (2 X 4 GB) for #1, giving #2 the old RAM (2 X 2 GB) of #1, giving #3 the old RAM (2 X 1 GB) of #2?  You want to make the best use of seriousness.

(B) is it true that the Max RAM for #1 is 8 GB (some said 16 GB but I doubt because it is not model 2011, it is 2000 years)

Max RAM for #2 is 6 GB (some have said that Apple only supports up to 4 GB, but 6 GB actually works, not sure?)

Max RAM for #3 is 2 GB (this can be a loss of upgrade because there only the Core Duo chip. The best he can do is a Snow Leopard operating system, then what?)

(C) my goal is to maximize the use (of course to reduce to a minimum the $ if I could), meaning better OS in the hope that, without changing the discs, we have faster computers the usual MS office and use a server running (Audio, network, video streaming for the record).

D) #3 can be recessed in the company upgrade because I fear it was born to be small, cannot hope to become Kobe Bryant, even if I give him 16 GB of ram. Thank you very much...

A. buy 8 GB for the Macbook Pro. The memory of the MBP is not compatible with the old MacBook. The 2 GB of #2 will work on #3.

All real B...

C. the MBP can run the last what OS X, Macbook 2007 can only run up to 10.7.5 Lion and the older Macbook can only run up to 10.6.8 Snow Leopard.

Buy your Mac as OWC http://eshop.macsales.com/ specialist trust ram and avoid the bargain brands or you could very well end up with three very unstable Macs.

Tags: Notebooks

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