DarkSable :
This is a desktop, right? Of course you can upgrade the ram!
Few things to note:
1) Do you game on this computer? If so, you want the fastest (Mhz wise) ram you can afford.
2) It will absolutely not void the warranty, as long as you keep the old ram around and swap it back in should a problem occur and you send the machine in
3) That brings me to this: Don't add to what you have - it could cause issues. Just buy new ram, totaling 8GB - either buy two 4GB sticks, or a set that has them as one item.
As for compatibility, pretty much any DDR3 ram will be, yes.
1 & 3) In that case I should buy 1 stick of 8GB (it's the same price as 2 of 4GB) and then later add another stick of 8GB when I can afford to do so.
2) It says you're excluded from warranty "if the product has been tampered, repaired and/or modified by non-authorized personnel"
Is there an exception to changing the ram or is it because they wouldn't be able to tell the ram had been switched before if I put the original ram sticks back?
once again, thanks for your time.