Originally Posted by ahheadlock
what's the difference between dx10 and 10.1 again? (legit question)
For the differences use Google.
Main difference is, 10.1 is something NVIDIA hates too see unless implemented on Nvidia cards and they are not in hurry with that.
It doesn't mean anything that, Nvidia recently signed on to the PC Gaming Alliance, whose charter involves pushing common standards like DX10.1 and increasing "the number of PCs that can run games really well."
For more read source
or Google more.