Cannot seem to run 4 PCIe Graphics cards on mobo

Situation:
MSI 890FXA GD70
Four Full PCIe Slots with Radeon 6870's
1100W PSU
I run 3 cards, all my openCL apps work fine
Install 4th card, everything breaks. OpenCL doesn't work, Afterburner doesn't work
Nobody on the OpenCL or the application team can figure out what the heck the problem is. Ideas?
I've swapped cards and motherboards (I have 2x mobo and 8x GPU for two identical rigs)

Are you using the proper slots?
Quote
Gen2 (2x16, 2x8, 1x4)
As not all slots are 16 or 8x

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http://www.amazon.com/Sonnet-USB2-E-Allegro-5-Port-Express/dp/B000MUSQGS/ref=sr_ 1_2?ie=UTF8&qid=1429981008&sr=8-2&keywor…
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Quote from: aliycen on 17-June-13, 00:31:21
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<http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/AppleDisplayConnector.j pg/220px-AppleDisplayConnector.jpg>
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Hi all,
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Cannot seem to run 4 PCIe Graphics cards on mobo

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