Intel X38 is short lived, will be replaced by X48
 

From our friends in the industry, they claimed that the X38 chipset is shortlived because it has some issues which remains unresolved. In replacement, the X48 chipset will replace the X38 in future shipments for the high end boards.

We are unsure what bugs are there on X38 which resulted in this move. The X48 supports a higher FSB with not much technical difference from the X38.