Multiple Monitor Issues w ASUS ROG Matrix 780 TI

[malvolio]

I recently upgraded to a 2560x1440 monitor and was previously using an EVGA GeForce GTX 670 SuperClocked 4096MB GDDR5, (04G-P4-2673-KR)

Using Dual Monitors I would use the main display to game at QHD and the offscreen would run 1080 and be used for tabbing out and/or having twitch on in the background.

The 670 was struggling to perform high FPS with the 1440 resolution so I upgraded to an ASUS ROG Matrix 780TI (MATRIX-GTX780TI-P-3GD5)

The issue im running into is with the 670 I never had a problem with the offscreen running twitch or anything else but with the 780 TI I am getting great frames on the main screen but if I even think about opening up twitch on the second monitor my frames go down more than half. The second I close the browser this problem stops.

I am not sure what the culprit is as the new card is more powerful than my previous one, someone suggested running the Nvidia Settings in Single Display performance mode but that did not fix the issue.

A colleague suggest that my 750W power supply with a single rail may not be enough what are your thoughts?

Specs are as follows:
Case: NZXT Phantom 630
Mobo: As Rock LGA 1155 Z77 Extreme6
CPU: I5-3570K 3.4 GHZ 4 Core LGA 1155
CPU Cooling: Hyper 212 EVO w Arctic Silver Thermal Compound
Memory: 16GB Corsair Vengeance (2x8gb) DDR3 1600
PSU: Corsair AX 750
Video: ASUS ROG MATRIX GTX 780TI-P-3GD5
HDD: 2 SSD (Samsung 840 Pro 256, Sandisk Ultra Plus 256), 1 HDD Seagate Barracuda 3TB
OS: Windows 8

 

[Tradesman1]

Is the game an online game? If so, opening Twitch will cut into your bandwidth to the net and can slow an on-line game

 

[bystander]

You might check for hardware acceleration on Twitch. Turn it off if you can. You may also be able to setup the 2nd monitor on your IGP.

I think what you are looking for is a way to not have your GPU perform any acceleration on the Twitch app.