How can I test my discrete graphics card in an MBP Retina?

How can I test the hardware on the discrete Nvidia grpahics card in my late 2012 MBP Retina?
I've had a *lot* of problems with it which I won't repeat here but the latest fun thing it's doing is crashing and requiring a hard reset any time *anything* attempts to access the discrete graphics card. This includes but is not limited to:
*Opening system profiler and clicking on Graphics (it displays a blank screen)
*Running a 3D graphics benchmark
*Running intensive mathematical calculations on the GPU
*Connecting to an external monitor with the thunderbolt port and using the computer for a short period of
None of these things actually work and after unsuccessfully attempting any of them the computer becomes very unstable shortly there after and usually crashes and requires hard reset. One time I got a crash report that said something about GPU panic.
Any recommendations? I get the sense that the apple hardware test is not doing a thoroough test of the GPU if at all.
Thanks.

If they add OSX support for this product and it comes in at a reasonable price point, it could be an attractive solution.
http://www.anandtech.com/show/5352/msis-gus-ii-external-gpu-via-thunderbolt
Also, there are products from other companies that allow connection to PCIe cards through thunderbolt. These two are geared more towards professional use (Audio/Video I/O cards).
http://www.sonnettech.com/product/echoexpresschassis.html
http://www.magma.com/thunderbolt.asp

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drenched wrote:
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