Anandtech show us this board doing its thing:

It really is no surprise that Intel CPU's are at their very best when teamed with Intel chipsets. Understandably, the release schedule of all the tier-one suppliers includes motherboards in either DDR2 or DDR3 format using either the X38 or the updated (speed binned) X48. While we have always felt that the synthetic performance figures of the X38 in DDR2 form have been lower than expected, the 3D performance gains over more attractively priced P35 chipset is always apparent. In DDR3 format the X38/X48 is the performance choice, and outperforms the DDR2 boards overall in just about every benchmark… well, at least by a few percent. Of course, this slight increase in performance comes at an expensive cost, with DDR3 memory prices being double that of DDR2 - if not more - depending on what speed bin you order.

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2GB memory overclocking is still proving unreliable between reboots on this board. We have found the board can run a CAS latency of 6 or 7 between 1600-1800MHz. However, the BIOS can be prone to resetting itself between reboots. A CAS setting of 8 is still where this board seems happy for 24/7 operation on current BIOS releases. Dual-core FSB limits are around 500FSB boot-up from BIOS. Using clockgen we have managed speeds of up to 540FSB for benchmarking the board with water-cooling. For absolute stability, we found 495FSB or so is the maximum limit when using a divider that pegs memory speed to around 1600 MHz.

We fully expect these FSB limits to improve with newer BIOS releases. We also made an attempt at 4GB memory overclocking using Microsoft's Vista 64-bit operating system. Using our QX6800 we managed both 6-6-6-18 1N timings at DDR3-1600 and 450FSB DDR3-1800 1N timings that are shown below (please refer to the BIOS templates for actual BIOS settings).