BR,
Did some research on the nForcersHQ site, which linked to this NF7-S review
http://www.hardocp.com/article.html?art=NDA2
This says about memory
Quote:
3 184-pin DIMM sockets
Supports 3 DIMM DDR 200/266/333 (Max. 3GB)
Supports 2 DIMM DDR 400 (Max. 2GB)
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I'm not sure where that came from, but it's probably safe to assume that a) it's accurate & b) it's true for the NF7.
Therefore you could try clocking your memory down to 333Mhz and see if you get the full 1.5Gb without errors.
HTH