Quote Originally Posted by EMC2
Without the correct datasheet, we can only make an educated guess...

But... based on your drawing with the voltages measured in Post 1 and the datasheet you provided, the pinout appears to be the same as the W83310S-R in the PDF. All the voltages are what I would expect.

The REF pin is what the chip holds the output voltage to. Note that the REF pin is an output, middle of the voltage divider. Note also that based on your diagram, the chip already tracks Vmem correctly... meaning there isn't a need to mod it unless you want to set VTT at a level that is different than half of Vmem.

If your chip does have the same pinout and basic functionality, then there are 3 possible mods that can be done as follows:

If you want to increase VTT, then you need to put a pot between the Vin and Vref pins (pins 1 & 3), value 100K.

If you want to decrease VTT, then you need to put a pot between the Vref and Gnd pins (pins 3 & 2), value 100K.

If you want to be able to increase OR decrease VTT then put both pots in place.


WARNING!!

BE SURE TO MEASURE THE TWO WIRES FROM THE POT BEFORE YOU PUT IT IN THE CIRCUIT WITH A METER AND VERIFY IT'S ~ 100K! If it isn't, then adjust the pot until it is. FAILURE TO DO SO CAN SMOKE YOUR MB!!!


Note2: Without having the correct data sheet, you take a chance. The choice is yours. That said, if the pinout and functionality is the same, the above is valid.

"Insert standard disclaimer about taking no responsibility, yada-yada-
yada"

Thx i think im gonna buy a regular an8 to practice with but i do not believe vtt tracks its just that i adjusted it in bios. etc when i run 2.8 ddr i run 1.4 vtt and so on matching my vtt to half my ddrv. Kinda wish the vtt wasn't a setting in bios chances are it would track if it was missing.