Quote Originally Posted by Truckchase! View Post
Hey guys,

I'm just getting my head around overclocking this platform and found something slightly odd. It seems that in some cases more qpi/vtt voltage equates to lower stability.

At this point in time I'm testing @ 193x20, 1534RAM, 3454QPI (can't recall uclk right now, but it's in line with the 8:9 association) with turbo disabled (until I get a feel for the chokepoints of the rest of the platform) and it's stability wasn't 100%. I had the qpi/vtt volts at 1.3125 so I thought I'd try 'em at 1.325. To my surprise the system was significantly less stable. I lowered the volts than to 1.3v last night and have been stability testing successfully since. For reference, my vDram is 1.64v, my vCore is 1.2565 and my PLL is 1.9.

Has anyone else experienced this?
1.325vcore, 1.86vpll, 1.3v qpi/vtt, 1.66v dram might be a good place to start. I think you're aiming at too little vcore and too much pll off the hop. unclk should be 16x - 18x max.