When you say "the dev" board, do you have additional memory you've installed on the dev board?
If not, it's probably still 133MHz.
On Boot, my module states:
U-Boot 1.1.6 (Feb 2 2010 - 17:21:38 - GCC 4.3.2) DUB-RevF4
for ConnectCore 9M 2443 on Development Board
DRAM: 64 MB
NAND: 128 MB
Fclk = 534MHz, Hclk = 133MHz, Pclk = 66MHz
I don't know yet if it changes elsewhere on startup.