Except dx12 is available for win10..... those who has win8.1 can upgrade to win10 for free within a year after win10 is out for retail.

Most of us stuck with Win7 >.<

Oh? Didn't notice it....

Here comes my family total 20 windows PC + Laptop.......

Somehow I really worry about the GTX 980Ti disabled portion of SMM........who knows what nvidia will disable without telling anyone (GTX970 3.5GB+0.5GB)

AMD marketing tends to make exaggerated claim. (Bulldozer, Fury X, Mantle, Directx 12, Trueaudio, currently hyping up Zen = only for AMD CEO to say amd plans to stay away from developing for pc market due to its volatility Read here )

Nvidia marketing on the other hand.......tends to 'mess up' specification (970 3.5gb?). Cleaning up every 'bad' comment on its blog and forums.
When nvidia release titan x with 12gb VRAM, I dont see their marketing team promoting it or exaggerating the VRAM benefit as much as what AMD does.

EDIT:
Take a look here.
http://www.geforce.com/hardware/technology/cuda/applications

This post has been edited by JohnLai: Jul 1 2015, 10:37 AM

This card can hit 6GB vram just fine. Those who get 5.7GB forgot about windows AERO is taking a chunk of VRAM in the background as well.

Even if you disable AERO, the basic compositing still take up 100-200Mb of VRAM.
Plus google chrome,firefox,safari and internet explorer also uses a bit of VRAM.
Not to mention a certain amount of vram also being used to display a image on your screen.

If you want to properly run the tool, you need to run it in headless mode.

In any case, you dont need to worry about memory segmentation. GTX980Ti doesnt have this issue.
All GTX980TI gpu memory controllers are properly linked to active gpu L2 cache. Only SMM units are being disabled this time.

GTX970 is unique in a sense that all of its memory controllers are perfectly fine, but one of its memory controller it isnt linked directly to the L2 cache. (Probably a segment of L2 cache is defective).
Go read anandtech article on GTX 970 memory segmentation