Any word on vref tracking with vdimm?

3.1v is pretty useless if your vref is only 1.25v. Vref should always be half of vdimm remember?

My guess would be that Vref comes form a separate IC - the vdimm IC doesnt look like it has enough outputs. It just depends how vref is set. if its set by register linked to vdimm in bios then were in trouble. If its set as 1/2 of vdimm on a strict input/output divider its ok.

If you want to check vref then run 2 sticks of ram and stick a multimeter in pin1 of one of the empty dimm slots.

Got the 4PDA2V rev 2.0 here - have taken measurements and vref is always exactly half of the PC health vdimm reading, but im not vdimm modded (dont need more than 2.6v with what im running atm). The exact half of the rail reading would suggest its on a simple divider, but I cant be sure.

PiLsY.