I'm about to get a MSI K7N420, and was going to get a Maxtor D740X, which runs at ATA133. In the manual for the mobo it says Ultra DMA 33/66/100 controller. This means I wouldn't benefit from getting the Maxtor, right? What if I got a Promise 133 controller card? Is there any mobo out that supports 133 right now? And finally, cna you really tell that much of a difference?