yes , HT is dual bandwidth , so its 2xthe rating shown in cpu-z. Your memory can take upto 2.45 V from the board. You should raise your vcore and the bootup time is because of the x1950xt that you are running. I bet your friend has an nvidia card. Its a known problem with the X1xxx series . Its got nothing to do with your board.

I do 5-5-4-12 @ 2.15V on my ballistix at DDR2-1140 . So you should be able to do at least DDR2-1100 with lower voltages. Lower your multiplier to an even number and try ocing the ram in sync ( I know it will lower your speed but at least you will know what the max your ram can go to ? )