Was unable to verify this module as working, however the problem was not isolated as definitely being this module. 

If working, also compatible with 2006 and 2007 models of Mac Pro [1,1 & 2,1] however may run at a lower speed of 667mhz. 

The 3 verified modules that were pulled from the same system are also listed.

Full details below (copied from a google search of the SKU code & edited for condition and quantity):