iMac memory expansion - help?

Hi everyone,

I just discovered that my early 2008 iMac supports 6 GB of RAM instead of 4, and because I frequently max out my RAM memory, I want to upgrade it.

Right now I have 2 sticks of 2 GB installed (brand ADAVA or something) but I have seen this Corsair Value 4 GB RAM (link) I want to buy.

Now my question is - can I combine this unknown brand with a familiar brand such as Corsair? Because I want to replace one of the 2 GB-sticks with the 4 GB Corsair stick.

If not, I'll have to buy another 2 GB Corsair stick and that's going to be more expensive than just buying that 4 GB stick.

I have a early 2008 iMac (20" / 2.4 GHz Intel Core 2 Duo / 4 GB DDR2 SODIMM 800 MHz, by the way.


EDIT - the only comment (in Dutch, sorry) on this RAM stick is from a guy with a Mac who said that 6GB is not supported officially but he has it installed anyway - since this is exactly the same situation, does this mean that it's OK to buy this?