From this review http://www.hardwarezone.com/articles...482&cid=6&pg=8
"From the way Gigabyte has pushed for the X48 lineup refresh, it would seem that they are keen to replace their existing high-end X38 boards with the X48 (which is why Gigabyte's X38 boards are almost out of stock in the retail channel). Intel may have originally launched the chip for the sake of high-end enthusiast support, but there is no sense keeping both SKUs alive with no real benefit over the other. This is the reason why we're seeing a DDR2-based X48 board from Gigabyte. From what we've gathered, the GA-X38-DQ6, GA-X38T-DQ6 and GA-X38-DS5 will all be replaced by their respective X48 counterparts.
Performance-wise, as we can see, the X48 is identical to the X38 on most counts, but the GA-X48-DQ6 did seem to perform a little under the average that we'd have expected of it, especially in SPECviewperf and AquaMark3. The variance is still within bounds not to suspect anything amiss with the board, still if you're a current owner of a GA-X38-DQ6 board, there really isn't any reason for an upgrade."
Guess I should really just sit tight and wait