Yep. What I can say, as well, is that power consumption increases quite a bit when adding GPUs...over 50W/card in my system.
Did you test with one GPU, or a fully stuffed rig?
I was rather puzzled myself...what does IVB-E offer, then, right? I mean, I can clock my SB-E just as high... higher... and get only 20W more power consumed. But IVB-E is faster in benches and daily use to me.
Also note, Raja, my CPU will not boot AT ALL with "stock" regular LLC, and 100% VRM setting. I can't get boot until I set 140%. Whether that's because the BIOS is garbage, or my chip simply pulls tonnes of power... I dunno.
I also pull ~50-65W less when using 125 BCLK.
I am not using software to get these figures, either. I test every board I review like this, every chip, with physical meters in-line on 8-pin EPS and PCIe connectors, and the wall wart, which is something that like no one else does (or at least, they don't give such data in reviews).
It might be useful to you to know my board is not retail, has no serial number, and came in a box with SILVER METAL ROG logo. It behaves a bit differently than my retail sample, but only a bit in mem OC, which I thought was odd, since they are same revision, apparently. That said, guys here with retail have also needed the same VRM settings to end reboots...but you've mentioned power figures might need adjust.
Edited by cadaveca - 3/5/14 at 12:07pm