There are a lot of threads floating around asking "Can my PC run ESO??" etc, and people replying with links to websites that anolyze your PCs hardware and tell you if you can run it or not. such sites include
http://www.geforce.com/games-applications/pc-games/elder-scrolls-online/gpu-anolyzer
http://www.canirunit.com
etc
These sites do not work very well and should not be taken seriously at all. I say base your decision to buy ESO on intelligence and common sense rather than what some bogus website tells you.
the first link I posted tells me that my PC can not run ESO at all. Lol. My rig is:
AMD Radeon HD 7650M 1GB
8 GB DDR3 RAM
i5 Processor
I run the game on a mix of medium and high settings at around 30+ FPS. I set the settings to Medium across the board, and then crank up various things to High, including Texture Resolution, Spell Detail, and view distance to 80/100 (100 is max). I run the game smoothly with these settings with my laptop. It's an entry level gaming laptop, not high end, not top of the line, yet I can still run it and enjoy the experience greatly.
So please use common sense when judging your rig, understand your components, realize what makes your game lag and why, which part is lacking, and crank down the graphic setting associated with that flaw...it really is just common sense...