RAM

[#1]

Currently have Corsair RAM and wish to increase the amount of GB.
The Motherboard information booklet advises sticking to the same manufacturer, would it make any difference if I used Crucial RAM or is it all the same. ?

[#2]

You need to ensure that whichever you use is compatible with what you have.
I see two options -
Use the Crucial scanner which should only give compatible memory
Post on this forum http://forums.hexus.net/corsair-memory/ and ask which memory would be compatible with what you have giving the relevant information - motherboard, existing RAM, total now and total in future

[#3]

Oldjim,
Thanks for the link.