|More that likely, when the specs where printed for your old Gateway, 1GB was the largest memory size available.|
"i might just put the 8gb card in and leave the other slot empty since I have it"
That might work, then again, it may not. If it does, you'll be running in single channel mode (64-bit) rather than dual channel (128-bit). But if you only had one 4GB stick right from the start, it's always been running in single channel mode.
message edited by riider