Just for comparison sake I decided to do a quick max BCLK run on my 940 using the R2E board. For some reason even when I set the BCLK to 222MHz CPUZ still shows it at 220.8MHz, and TurboV (silly Asus tweaking tool) shows it as 221MHz. Either way, it's set at 222MHz x 15 and boots with 3.33GHz. I just randomly picked a voltage of 1.10625V (LLC is not enabled).
Should this be impressive (see screenshot)? Based on what everyone is making out the D0 to be it should...
The point is, this D0, there is nothing to it. It just creates a false impression that the chip is amazing. Realistically, there is nothing different we are seeing here than with a C0. Max BCLK/QPI clock is either restricted by the CPU or by X58 IOH. Not sure which one, and we won't really know until maybe the B-3 X58 revision is out to put this to the test with its IOH improvements. I believe Saaya had a good theory on QPI limitation being tied to the X58. Only a lower multiplier for QPI will at this point allow higher BCLK speeds and I think this was known about a week after i7 came out. I posted about it way back as well. Some boards do a bit better job, like the DFI, but most will top out (99.9%) at 220MHz-222MHz, or basically 4GHz QPI (8GT/s).
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