Intel's X48 chipsets in no short terms will displace the X38 chipset as the top dog. In fact, we can't see any reason to go for an X38 when the X48 chipset offers the same with official FSB support of 1600MHz, and so far we have seen three good boards already, with even more on the horizon.
So far we have only had three candidates, and all three have performed admirably. However, things get better and better with each board. The ASUS P5E3 Premium WiFi really opened our eyes, its overclocking and feature set made us sit up and take notice of the X48.
The GIGABYTE X48T-DQ6 has also given us full confidence in the X48 chipset and GIGABYTE's design, though we do favor the ASUS P5E3 Premium's inclusion of the WiFi controller and their third PCI Express x16 slot onboard over the GIGABYTE setup, as it lacks the option for CrossfireX and a third graphics card to run as a physics engine, or just to use for a large PCI Express based SAS/SATA controller. This is where ASUS gets the leg up, however the power efficiency and overclocking crown so far goes to GIGABYTE's X48T-DQ6.