OK, results first and then I'll post to some of the other questions/comments above.


The only difference now is the 920 has triple channel and the 860 has dual channel RAM. Screenie of the new 920 setup posted above, again.





Here's the raw data of the 920 matched exactly to the 860. (Except, of course, for triple vs dual channel RAM.)



As before, you are welcome to check my math here....

Doing the same math as above we get 84:639:806.

Converting to hours that's 94.873888. Dividing that by 24 WUs we get 3.9530787 Hours/WU.

That's .042488396 hours FASTER than the 860. Converted to minutes, the 920 is now 2.54930 minutes per WU FASTER than the 860.

Perhaps the triple channel does come into play?

Perhaps there is some natural variance in the numbers? I'll make one more 920 run at these settings to see. We don't know how consistent the numbers are without multiple tries......

If there's not much variance between runs, we can make a couple of conclusions. (OR at least I can. You may, or may not, agree....)

1. Even at 2.5 minutes per WU difference between rigs, the 860 is still in the same league with the 920. The difference is just over 1%. The back end variances of WU score, quorum wingmen, quorum score, and WU daily timing are MUCH greater than that..... 1% difference would be lost in the noise. The 860 is more power efficient. For those with high power rates, this is a no-brainer.

2. QPI setting makes a pretty good difference in production. This was shown when I had the QPI cranked down on the 860 and the rig was fairly well behind using the older "random WU average" method before. I could test this using the new "fixed WU" method, but I'm convinced it's real.

3. Uncore/NB and/or the 1T timing change makes a reasonable difference. The 920 with the faster Uncore and 1T timing was 3.21 minutes/WU faster than the lower uncore and 2T timing. This is about 1.3% faster. Personally, I would bet it's the uncore that made more of the difference, over the 1T vs 2T timing change.

4. The new "fixed WU" method of testing rocks!! Thx to Snowcrash for suggesting it and everyone else for fine tuning it. I'll be keeping those test WUs on the stick for a long time....I may have to run them on some of the kent's farm rigs when they come home. What I'll have to keep in mind now is the difference between threads and cores. The i7 rigs do 8 threads at a time vs the kent's 4 cores.

Regards,
Bob