I just talked to Oskar on the MSN, and we discussed a bit regarding the Vdimm source.
All the story is here, I already translet the conversation to English version.
This is extremely important that you will need to know if you expect to get DFI NF4 series board.
hope this will help!!
OPB
************************************************** *******
opb: Is that true that LP nf4 vdimm use 5v rail?
Oskar: no, it's not directly from 5v rail. It got jumper(JP17) can switch vdimm source!
OPB:oh?
Oskar: If you see the board, on the lower right hand side corner, there is a 6x2 jumper set, that's the
vdimm source switch!
(OPB: please see the attached pic)
oskar: so if user directly switch the vdimm source from 5v rail but use actual vdimm value under 3.3v,
then that would cause serious heat on Mosfets. That 's why the factory default vdimm source is set from 3.3v rail.
**(OPB: SO, if you are not going to do vdimm over 3.3v for 24/7, I and Oskar would not suggest you to switch vdimm source to 5v rail to get that heat on your
MOS)
oskar: However, even though user switch 5v rail source to do vdimm above 3.3v, the heat is still unbelivable hot there. therefore, that's why we use
the 4000~10000 hours 105c very good caps on that area. I would definitely suggest users can give that area some air flow to reduce some heat from there.
Board pic, the red circle shows the Vdimm source switch for 5v or 3.3v rail.
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