Now, that is what I'd call a clear reply
It illustrates how most of the industry is as much captive to the software as to the hardware.
But Photoshop can dither the display, I think, so you will still get the benefit of the extended gamut, I believe, just not perfect gradations.
I think these monitors are used more for proofing these days -all those brand spot colors- than for actual work.
A 10 bit video card wouldn't make much difference anyway in regards to Photoshop which generates previews in 8bit only.