Apple RAM stopped working - should I buy Crucial for replacement (UK)

I just noticed my Mac Pro (Early 2008) 8 Core bought in early 2009 (just before the newer model came out has been running slow. 
I've just checked and although 10 GBs installed - 2 x 1GB (Apple) and 4 x 2GB (Crucial).
I won't to replace the memory, but Crucial are only showing 4GB (2 x 2GB).  Is Crucial still the best option for replacement in the UK.
Thanks in advance.
Matt

I'm confused, RAM either works or it does not - it does not slow down with age or use.
In Activity monitor, are you showing many page outs?  If your system is not swapping to disc with the amount of RAM you have, then adding more or replacing what's there will not speed up a thing.
If your RAM has actually failed, then sure, Crucial is a great source.  Apple does not actually make RAM, they just buy from suppliers like all computer companies do.  Often, Apple devices ship with Crucial RAM (or Samsung or Kingston - I've seen new systems with any of those in them).

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