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Unless you are planning on upgrading Poser going to a new PC wouldn't benefit you that much performance wise as your biggest bottleneck is going to be Poser 6 itself. P6 can't use multiple threads for rendering and is limited to 2GB a thread (32-bit app).  In order to take advantage of the newer hardware, you really need to be working in Poser Pro and above with the Firefly render engine on a 64-bit operating system.

I was beginning to get that feeling. Good to know not to waste my money. Thanks.

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Don't know if anyone has tried it yet with Poser, but Octane is software agnostic and just requires an import of an obj. file with the materials data to work. .rib import is coming, too. Poser can export .obj and .rib files. You will probably have to correct your materials in Octane or just use Octane to set them up. Octane will also have a good collection of materials soon. I'd try it but I haven't got the money to finish my new PC I've been building that will use a newer Nvidia card. Octane will run with older Nvidia cards as long as they have CUDA cores and the drivers that work with the program. Fewer cores means a slower render, but what you're getting is usually faster than a CPU doing a render with advanced lighting techniques. YMMV. More info at refractivesoftware.com

I was meaning more fully compatible in terms of being able to load actual Poser Scene files. Does it support any kind of rigging system?  It still is nice to know that there could be some level of compatibility at least.