Quote - I bought the 2x2GB 800MHz G.Skill memory and it works fine with my ASUS P5WDH Deluxe motherboard, so I'd expect it would work fine in yours, although in my case the motherboard won't actually run it at 800MHz, it slows it down to 533MHz (meaning you're likely just as well off buying the slower mem and saving 30 bucks).

Quote - VERY interesting!  I just checked the specs on the motherboard you mention and it says the following:

ASUS P5W DH DELUXE/WIFI-AP LGA 775 Intel 975X ATX Intel Motherboard
[...]
Clearly I have much still to learn since I would have thought this setup would support DDR2 800 RAM running at full tilt.  But if not, then I can indeed save $30... twice! 

The P5WDH was designed with overclocking in mind so it's configured to assume very conversative settings when it comes to frequencies and voltages and so forth.   This is especially helpful in overclocking crash recovery but it also means that you may have to tweak things a little in BIOS.

For instance, I put in 4GB of OCZ Titanium on my system.  It's technically PC2-6400, 800/1066mHz RAM.  However, the P5WDH configured it to initially run as PC2-5300, 667mHz RAM. 

A few key presses in BIOS and it was running the RAM at full speed.  So it is possible to have the P5WDH run your RAM at full tilt, even when it decides to run it slower when you first install your RAM.