Looked at some Intel docs for PD and CD/CS, they both have 3 BSEL pins.
Is it possible that more than the defined BSEL combinations work for CD, like 200 and 266 MHz?
After all, this is the specs for the CPU's, but it's up to the chipset if it's supported. Would be great for laptops, just like going 100 to 133 MHz with a PM, although that was already defined.

Code:
BSEL2  BSEL1  BSEL0  PD  P4HT CD
  L      L      L    266 r    r
  L      L      H    r   133  133
  L      H      H    r   r    166
  L      H      L    200 200  r
  H      H      L    r   r    r
  H      H      H    r   r    r
  H      L      H    r   r    r
  H      L      L    r   r    r

r=reserved