A brieft test with my core i7 975 es D0
with air cooling 235MHz of BCLK and
stable at 233-234MHz. its a bit wierd, seems
the PCIe just affect a bit around some MHz to improve
the QPI bus.like i got same results with 106Mhz and 130MHz of PCIe Clk

235MHz of BCLK , and QPI bus is 8.4GT/s


234.7MHz 1M with PCIe 108MHz, actully i tested 106 the same


another run 233 8M with PCIe 130MHz