bloodline76 said:
i have stick of 1gig pc 3200 ddr400
And two 512 corsair 4400.
So i could have 1 stick 3200 1gig plus on 512 = 1.5gig
Better I would be better off keeping the matching pair?
It all depends on several factors.
The 1gb stick and the 512gb stick may or may not run together at all as they will have different ICs, PCDs, latencies, etc.
The pair will be forced to run at the slowest of the 2 DIMMs speed and, the PC4400 may not even run 3200.
The Asrock bios may not like the mixture.
Do you intend to OC?
Do you "need" the extra 1gb of memory?
Etc, etc, .....
The only way to know for sure is to mix them and try them together doing the things you built the system for.