Can my computer support Total 3GB of PC2-6400 RAM?
This is my motherboard...
4006229RMotherboard GM965 Chipset Intel Video W/10/100LAN No HDMI Link.
The specs in the link you cited indicate that the memory bus maxes-out at 667MHz. This is the equivalent of PC2-5300. If you're buying PC2-6400 memory, it will run at PC2-5300 speed. Given that, if you have a choice between some PC2-5300 memory and PC2-6400 memory and there is a price difference -- go with what's cheapest.
Can my computer support Total 3GB of PC2-6400 RAM?
This is my motherboard...
4006229RMotherboard GM965 Chipset Intel Video W/10/100LAN No HDMI Link.
The specs in the link you cited indicate that the memory bus maxes-out at 667MHz. This is the equivalent of PC2-5300. If you're buying PC2-6400 memory, it will run at PC2-5300 speed. Given that, if you have a choice between some PC2-5300 memory and PC2-6400 memory and there is a price difference -- go with what's cheapest.