Why do you reduce the hypertransport from 5x to 4x when overlocking past 220mhz. would a higher HT be better?

Question

Every guide I read says to keep as close to 1000 as possible. why?

Answer 1

The HyperTransport is different than FSB on Intels, the HyperTransport can only so high before it becomes unstable. That is why you try to keep it around 1000.

Answer 2

A higher HT would be better, but there is a limit to how high a particular motherboard will go before becoming unstable.