Current quality boards have ata100 controllers. If you have using only a single ide drive on a channel, it will not use even close to that no current ide drive gets that 100MB/s (highest is around 44MB/s I think) throughput. I have seen some site claim this but that isn't the deal, you think if the disk could in any situation the company wouldn't claim that? If you plan to daisy chain (i.e master/slave) to high throughput drives like the IMB you mentioned then an ata 100 will do well for you possibly. If you plan on keeping your board for a while, then that means
1)you want the best board you can afford now, with all the current technology, so when you upgrade next you may just be a step behind current. All in all unless you never plan to upgrade on this board ata 100 can be useful. Hope this helps.