New
#51
The timings were one things if too high for what the board generally takes. That may tend to be standard or value ram over any good performance dimms. If the brand you bought is on the recommended list the type would be the likely cause there.
Now for going out and rushing into a new board just to run DDR3 you are also looking at a total upgrade which will cost you far more since you may end up needing a new cpu as well as memory and a few other things to consider.
If the new dimm turned out to be defective you would simply see that replaced by itself or a new pair since the prices on DDR2 are low at this time. If you were planning a new build soon then I would say wait until the new one to spend on what you want there.