Serial Maker Softwell When Running Serial Video Cards, Do The Cards Have To Match Maker, Gigs, Etc?

When running serial video cards, do the cards have to match maker, Gigs, etc? - serial maker softwell

I intend to lead a NVIDIA GeForce 8600 GT 1GB PCI-E with a NVIDIA GeForce 8600GT 512MB PCI-E.

I would like to limit the focus on this problem for people who have acctually tried this configuration, too.