demonkevy666: On the 1.4 bios you don't have the option to lower the NB multi, so at 216 on the HTRef your IMC will be running at 2160. I'd be willing to bet that is whats causing the limit.

In the earlier days I used to run the 1.1B3 bios at 266 HT mainly because the 1066 memory option didn't work and it was the only way to get the memory up to speed. These were the settings I used 266 x 10.5 x 8 x 7. The 8x multi on the NB kept it below 2200.

Really, since they fixed the 1066 ram on the newer bios theres not much need to run high HTRef speeds (and it can cause stability problems).
I only use it now to tweek the NB and Memory and rarely take it over 205.