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RCoon - very kind offer of you - thanks a lot. Yeah still looking at the Acer - work didn't fancy a refurb, even though that one you linked to was pretty nice looking spec-wise.
I guess, from what you say, then, that the max speed is 1333, if the one fused to the board is running at that speed.
Good news is I'm/work are not in a rush so can keep researching.
Thanks again.
p.s. is it me or are forums like this the last bastion of real technical knowledge? I've posed questions to PC World's staff, and even to Acer directly, and they've not known the answer. A guy in PC World didn't get my question re: dedicated GPU memory, and just kept replying with answers re: main RAM memory. Nor could he say whether there was a PCIe slot. Acer couldn't confirm what the max speed RAM the model would take, and told me to go to Crucial.com to find out!