Different Module of DDR2

[Dea924]

I Currently use 4GBS worth of adata vitesta Ram in my rig and i want to add another 4gb, but seeing as the above costs £99.99 from a ridiculous shop id rather not pay that.. i was looking intriguingly at the 4gb (2x2gb) Geil DDR2 Ram on O.c
http://www.overclockers.co.uk/showproduct.php?prodid=MY-096-GL&groupid=701&catid=8&subcat=813

The only thing that sticks in my mind is, will 2 different brands work fine together if there all the same timings etc etc?.. or does it all have to be the same

Cheers for any replies and help x

 

[Dea924]

It's mostly for the extra headroom when it comes to gaming etc, I've been getting a lot of blue screens lately aswell, with 768mb on the gfx card itl make running things with extra requirements a bit smoother, I may just look on the bay. N see If there are any