Also very interested in quadcore results.

What's interesting in the graph that HDCHOPPER posted (in the other thread about the same subject) is that the margin for error in GTL refs drops very close to 0 as you approach 1800Mhz fsb, but seems to bounce back up again after it... this tends to suggest this it would be very difficult to tune GTL refs to 1800Mhz but easier at slightly higher speeds..