I need to know a few things before dealing with ihis
how much ram
processor speed
onc ei get this there are 2 issues one is the read /write speed difference between the rpm and data transfer rates of the two drives.
when was the last time you defragged the drives????
even though you are running a clean install the holes left inteh hardd rvie by win installs will hcoke a horse.
dohnt use the win defragger, try diskeeper lite its fast easy and actually runs better and faster anyway.
the data cable you are using has nothing to do with it also whats the front side bus speed out of the processor to the ramit may be too slow for the sata, but you may be abel to buffer it by changing the swap file size