Accel Cards next to other PCIe Audio Cards in the same Mac Pro for PT 10+11?

[relaxo]

We need to run another PCIe audio card next to our Accel cards in our Mac Pros. Will Avid Native cards and Accel cards both work when next to each other in the same Mac Pro? What about Accel cards next to one of the ADAT optical lightpipe PCIe cards out there? Will any other PCIe audio card work next to Accel cards?

Why this is required:
Having three Pro Tools Accel Mac Pros that need to run 8+ channels of audio in both PT10 TDM and PT11 is excruciating. We can't even run PT 11 via 8 ch of Core Audio through the Accel cards, so now when running PT11, we lose our expensive, gorgeous sounding Avid HD IOs which are only connected to the Accel cards! So so so messed up. We take out the Accel cards and we lose 1/2 of our clients instantly that need Accel cards for TDM plugin-based sessions. The Accel cards must stay, yet we need to get 8+ channels of near zero latency audio when running PT11 out of the same machine.

Can't get Firewire or USB interfaces due to unusable latency. Can't go Thunderbolt interface because Accel Mac Pros don't have Thunderbolt. Must be some PCIe audio card next to the Accel cards.

Griping:
And please don't suggest any crazy ideas, having two Mac Pros in each room is not viable on any level for us. It's bad enough buying three more high-end ADDA interfaces with three new PCIe cards, AND WIRING THEM INTO THREE NEW PATCHBAYS. ($15k-$20k) Avid, please enable us to simply run PT with Accel cards via 8 channels Core Audio (like Logic and all other DAWs can.) Hundreds (thousands?) of loyal PT studios need Accel cards for years to come to keep guest engineer clients that mostly have PT7-10 sessions with never-AAX EchoFarms, etc galore...and the other half of clients are demanding PT11. This in such a horrible and unnecessary situation.