Quote Originally Posted by dejanh View Post
If at any point you cannot boot, increase your QPI Voltage (VTT Voltage) by 0.025V and try again. Keep increasing it by that amount until you can boot at the given BCLK. Do not exceed 1.475V on QPI. For example, if you cannot boot at 190MHz with 1.35V QPI and you increase the voltage twice (2 x 0.025V) to 1.4V QPI and then you boot fine, you need a minimum 1.4V QPI for 190MHz BCLK. If you want to be sure that the given BCLK is stable then take the minimum QPI voltage required to boot and add about 0.025V to 0.05V to it.
Isn't it true that if you e.g. find a max. bclk of 210 with all multi's lower than rated and a QPI/DRAM voltage of 1.35v, this doesn't imply stability when raising the multi's? To put it in other words, wouldn't QPI/DRAM be stressed more after raising the multi's again and subsequently needs additional voltage? Or is that the reason you suggest to add another extra 0.025 or 0.05v?