Should I do a mobo swap?

[greengolftee87]

So I just got a free older PC in really good shape. My current file server is a P4 3.2 Ghz 1 gig ram and about 12 TB on a Supermicro 8 port PCI x64 card but running at x32 because the motherboard only has 32 bit slots. Also a PCI intel gigabit server nic. Since all this stuff is sitting on the PCI bus I get real world transfer speeds of about 55 MB/s.

Free computer is a P4 3.4 Ghz with 4 on board sata ports, on board crap gigabit nic BUT it has what I think is a PCI express x16 slot with a video card in it. (slot looks same as pci but notch is at the other end) and a PCI express X1 slot

So the ultimate question is, Would swapping these boards and probably combining the ram get me faster transfers. If i continue to use my current sata card as the only thing on the PCI bus and get a different intel nic and put in one of the express slots will that improve my network speeds and give me full gigabit access to the drives