Just got my copy of assasins creed black flag. Started playing it and getting terrible frame rates. Especially when in the built up cities. My gfx card is the gtx titan so not your mid-range GPU. I'm also running an i7 3770k. Does anybody know why this might be? I've tried updating drivers etc. lowering settings right down helps a bit, but I've heard people with less powerful cards able to play on maxed out settings. Any help would be appreciated.
How much ram?
Are you sure that your not accidentally using the integrated graphics card?
Download a program that will monitor your framerates and if its above 60 you may be getting screen tearing and artifacting due to the card pushing more frames per second than the refresh on your monitor.
Try reinstalling the drivers. (always click the clean install button)
Check bios and see what the card configuration is.
Just a few suggestions. Not sure if any are your issue but its a start.