I try it out - thanks
What kind of PC do you have and do you know what your power supply is?
I have an old Dell used for a HTPC and easily put in a HD7750 with the 350w crap power supply and crap generic MB. This does not however mean that I can just stick in a GTX 980.
Its a custom pc - power supply have no idea
How old is the machine, is it a gaming rig purchased with in one year or two years time or further back, if so might be time to consider upgrading and the GTX 980 Ti is overkill if you are just gaming, the GTX 970 is more than enough, the higher models above that is just a pure bragging rights thing 9 times out of 10 and not needed.
The main issue when going that high end version is people tend to forget their monitor if you upgrade to a GTX 980 Ti and such because that is the one you just must have, you will still loose out on it if you do not own a higher Hz monitor something like a 144Hz.