Well, it's a loaded question and I'll give a loaded answer.  On the XP's, right now I've got the power levels set to about 80%, with RAM at 6000 and GPU core at 1733Mhz-ish. That gives me roughly 720 - 740 SOL/s. But before you scream rippoff, I have a mini rig with a couple 1080TI's that can do the same with mild tweaks... but the Titans use a lot less energy at 80%. It's around 225 watts. The TI's use 275 - 300 watts to get the same result.  Now, I can get 810 -820 SOL/s on the Titans by upping the power to 110% - 120%, but my consumption jumps to 300 watts and I start to get diminished returns. If I had free power it wouldn't matter and I'd leave it at 820 SOL/s.

My 1080's average 510 -540 SOL/s at 65% - 75% power. Interestingly enough, I have two cheapo MSI reference cards in their own separate rig doing 545 SOL/s, beating all my other EVGA and Gigabyte 1080's, I can't explain it.

Total Hashrate is about 20k with what's in the picture.