GPU mini ITX performance vs sized one

Lester23

Honorable
May 10, 2016
56
0
10,630
Hello.

I am thinking to buy a new GPU, and I just saw a Gigabyte GTX 970 Mini ITX. Indeed, has lower price but I am more concerned for performance .
My question is, the Mini ITX versions are 'weaker' than the sized cards ? Obviously they eat less power but how about frames? Thus I don't want to upgrade for a while, so it's at least worth buying ?