For the Intel Board DP43TF:
As long as the memory specification meets the requirement below and that you have the latest bios version, it must work. (Intel has not validated all memory - but if your memory is on the tested list, and it still does not work, then there must be a problem, you need to let them know)
System Memory Features
The Desktop Board supports the dual or single channel memory configurations defined below.
Four 240-pin Double Data Rate 2 (DDR2) SDRAM Dual Inline Memory Module (DIMM) connectors with gold-plated contacts
Non-ECC, 1.8 V, DDR2 800/667 MHz memory
Serial Presence Detect (SPD) memory only
Unbuffered, non-registered single- or double-sided DIMMs (except double-sided DIMMs with x16 organization)
Up to 2.0 GB utilizing 256 Mb technology
Up to 4.0 GB utilizing 512 Mb or 1 Gb technology
Up to 8.0 GB utilizing 1 Gb technology
A minimum of 512 MB of total memory is required
Hope this helps a bit.
If you are getting a memory which is not on the list, all you need to do is to check the memory datasheet from the manufacturer website and see if it has the requirements above. (voltage, spd, speed and type are the main things to check)