Like hornet said it is your cpu, sounds like you may have gotten unlucky with bclk limit. Intel has said some bclk's will have limit of 180's other 190's and most wont get past 220's, though few have. If we ever get lower qpi multi's that may help you, but dont know if that is coming anytime soon or at all on our chips.Originally Posted by hlonipha
I can do 215 bclk with minimal vtt/qpi, like 1.35 (I got one with decent limit, but not the best). Then to do 217 bclk, I need 1.64qpi. I have a soft wall at 215 and a hard wall at 217, the sharp cut off is amazing. But it is pointless for me to try to get above 215 bclk for anything other than benching.
You may have your first wall at 189. You might want to try raising qpi/vtt even higher...just for curiosity sake...but probably not going to go over 189 for 24/7 with your chip. But I would try at least 1.45 to 1.5v qpi/vtt once just to see if it will even boot at all, and raise qpi pll to 1.16 or so as well, it is necessary as well for me to go from 215 to 217.
Others have had the same problem, sold their chip, then got lucky on next purchase and OCed past 4, past 200 bclk, no problem with low qpi/vtt.
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