Yo guyz.I got R9 295X2 GPU ready for 4K(maybe higher resolution),actualy I got whole new computer with that GPU so I just want to ask if someone knows for some ultra HD texture mods for Skyrim???

Try looking in the http://www.nexusmods.com/skyrim/mods/searchresults/?src_cat=29 category at the nexus. Also while running 4k is nice to brag about it's not very practical as it's hard to really tell the difference between 4k and 2k in most cases and your just adding that much extra strain on your system. But hey have at it hoss.

The general HD replacers are 2K, including my favorite, Skyrim Realistic Overhaul. There are 4K replacers for rocks etc. and I notice the difference for the ones I'm using at least (http://www.nexusmods.com/skyrim/mods/37256/? is my current favorite). Anyway, even with a supercomputer you'll need the memory patches in ENBoost and SSME (included in the latest SKSE), otherwise you'll hit the 3.2 GB RAM ceiling and get CTDs, infinitive loading screens and other issues.