How much do you want to spend?  :P 

I have a Radeon 5570, which is adequate, if not blazing; there are much faster cards out there now, but Poser only uses it for the viewpoint (unless you use an external GPU render, of course)

EDIT; I looked up some benchmarks to find a comparable current card, and it's a bit slower than a  Radeon R7 240, which can be had for around $60...

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
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