29k doable about 4900+ Ben you scale about 1000 points give or take if your scaling NB and cpu 100 mhz until you hit about 6 gig then scaling kinda waivers.
chips avg from 4.6-4950 ish is the highest i've seen on DI, more than 2 cards costs a hit, I lost 50 mhz on the same chip from 2 gpu to 4 gpu from 4950 to 4900.
The MSI 790FX- GD70 is solid on DI, might want to give that a whirl, if anything can hit 30K on DI I think that would be the board........it's 100% solid for us on DI......i've only seen the deaths happen above 1.7v on ln2 and we ran one over 1.7v on ln2
Here's a rough Idea for you.
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