As stated above, Windows 10 is still in development, the drivers still aren't written to take advantage of the kernel and other libraries that it comprises of to make the OS, there is still DirectX 12 to be put in there as of this moment, it still using 11.x but it will be added in very soon (a little bird has told me....).
Nothing will be finalised for another 4 or 5 months or so, and the final / gold build will be picked out of several builds (for windows 7 and 8 I think they had to choose from 8 builds then narrowed it down), and this is done by a panel of several people, once the final build is decided, the debug code gets removed from it and then it will run alot better, and by then the major players will have nailed down their drivers for it (eg nVidia, AMD, Creative, HP, Asus, MSI etc).
Till then unless you are a tester (like myself) or just want to run the latest and ARE WILLING TO PUT UP WITH BUGS, CRASHES AND LACK OF PROPER WORKING DRIVERS (to some extent), then you are better off using windows 7 or 8.x
Complaining about lack of working drivers in a beta OS and an unfinished product on here is not going to net much help unfortunately. As it said in the TOS you agreed to when signing up for the Technical Preview, it is still in development, and there for it shouldn't be used for your everyday OS due to its very nature, and instabilities caused by different hardware mixtures on different builds.
I hope you can understand this, and if you need something like ther EyeFinity software and drivers, then you should stay with 7 or poss 8.x
