soft to Utilize Intel 3rd gen GPU + latest Discrete gpu at once

No. If it was easy to do SLI and Crossfire would not be problematic for most games.

Logicearth

there is software which support Intel 2nd gen. gpu + latest Discrete gpu

http://lucidlogix.com/product-virtu-gpu.html

here

Consumer Benefits of Combining Intel Sandy Bridge CPUs with Discrete GPUs.

Video conversion at 300 - 600% faster with Intel QuickSync

HD/Blu Ray video streaming online enabled by Intel Insider

Consistent performance when simultaneously running advanced media and 3D graphics applications

Enjoy your favorite high performance casual and hard-core games

Supports DirectX 11 as well as Anti-Aliasing features

Dynamic virtualization eliminates the need for system restarts and cable swaps

Reduces power, noise and heat, while increasing system longevity

It doesn't make it so your game runs faster. The game will not use both at the same time. What it does, it send some applications like video decoding to the onboard GPU while sending stuff like games to the discreet GPU. It does not work like you are thinking like works.

Go with a trial first if you want to try it. I tried it and it made games crash.