Can you be more specific about the RAM you tried to install? What type is it? The DP43BF only supports x8 type memory modules. In other words, eight chip memory modules. The two sided 16 chip (x16) won't work. But the board does indeed support 1333 memory modules up to 8Gb by 4x2Gb method in over-clock (OC) mode. Native support is 1066Mhz.
By the way, your link is to the product brief. The real specs are here: http://www.intel.com/support/motherboards/desktop/dp43bf/sb/CS-031271.htm
The MemoryTen sticks were generic; the sticks I bought from NewEgg were Crucial CT2KIT25664BA1339 R. Both the MemoryTen and the Crucial websites specifically state that the memory I purchased was compatible with this MoBo.
Re overclocking, the Intel website (and bios) recommend against it. As a practical matter, however, do you think I'll run into any problems overclocking the 1066 Kingston sticks to 1333?
Thanks for your help!