The Guru of 3D published a review on the Gigabyte GeForce GTX 970 OC Mini-ITX
A quote from the article:
We test the 17cm long Gigabyte GeForce GTX 970 OC Mini-ITX graphics card. The product does not vary much from any other 970 other than its size. Housed in a compact design this card might just be what the doctor ordered for a small Mini-ITX or Micro ATX build. The card has 4 GB graphics memory (well, 3.5 GB), is energy efficient and factory overclocked for you. You will be surprised by how this card looks, how silent it is and how well it performs.Gigabyte GeForce GTX 970 OC Mini-ITX Review @ Guru3D
The GPU used is the 28nm GM204, the two derivatives created from it are the GeForce GTX 970 and 980. Ah, you noticed? Yes, correct, Nvidia decided to skip the 800 series to avoid confusion with some of their rebranded mobile parts. Maxwell is a new and sound architecture and as such it is released with a new series name. In this article we will have an extensive look at the architecture behind Maxwell, we will look at gaming performance from Full HD to Ultra HD.
So, a compact performance graphics card designed primarily for small form factor PCs with mini ITX motherboards. This tiny dual-slot card measures just 17cm and features the NVIDIA GTX 970 GPU. With a TDP at roughly 160 Watts the card won't draw too much power either, but it surely packs power, it is silent and the GPU core temperatures remain completely under control.