5100+ddr2 is perfectly viable. fbdimms, after all, just a wrapper/extender
that introduces more latency with the claim of higher capacity (they
contain
ddr2 or ddr3 inside the memory-buffer interface.)
Some info re specific motherboards with Intel 5400 chip set that support
DDR2 would be very welcome.
why are you fixed on the 5400? it is, afaikt, fbdimm-specific,
though the 5100 supports ddr2.
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