OK, here is an update of the progress that I've made so far with installing Mountain Lion on my ESXi 5.1 box with GPU passthrough for accelerated graphics.
I spent a lot of time looking at these sites and searching with Google to find the most inexpensive and compatible out of box video card for Mountain Lion:
http://www.macbreake...hics-cards.html
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I originally bought a nvidia GT 640, as it looked to be quite compatible with Mountain Lion, but in the end I found out that ESXi passthrough with nvidia cards did not work too well:
http://networkingbun...ts/vmdirectpath
So I returned the nvidia and spent time researching AMD Radeon cards here:
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I found a Radeon HD6570 for about £40 and set up GPU passthrough in ESXi (I forgot to say that I did install Mountain Lion first without the Radeon card - I don't know if that would make any difference).
From your host, select the configuration tab, then "Advanced Settings", then "Edit", and select the A...



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