Yes, a lot of times memory mismatches (in both size or brand) could cause bluescreens. Another possibility is that the 4GB ram module you purchased could be bad. If you download a program called memtest86+ you can burn it to a cd and boot to it, then let the program run for a few hours to determine if your ram is bad. Otherwise I would suggest sticking with the 2x2GB configuration or upgrading the second ram module so you will be running a 2x4GB configuration.
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by: NeilsrPosted on 2009-09-05 at 05:07:30ID: 25265908
From Crucial.com......
Each memory slot can hold DDR2 PC2-6400,DDR2 PC2-5300 with a maximum of 2GB per slot.*
*Not to exceed manufacturer supported memory.
So would seem that 4Gig is all that Gateway support on that model