For BF3 med/low for sure at that res. For Skyrim med/high at that res. But it all depends on what kind of PSU you have and if it can handle the GTX 465.
The only way you will for sure find out what settings your rig will play those games at is to try them. But for the most part in general is what we have stated. Good luck and have fun gaming.
EDIT: My bad I wasn't looking at the res I thought you were talking about higher res then the 1080 I do apologize with the lower res you will be able to play on high to ultra on both games.