I got the elgato hd60 pro capture card for a 2 pc setup. I have an ausus 144hz monitor. This worked for me so I thought I would capture this from redit for future referal:

https://www.reddit.com/r/Twitch/comments/3u4rab/nvidia_gpu_144hz_elgato_hd60_pro_dual_pc_oh_my/

Using higher refresh monitors for PC gaming and streaming is becoming ever more popular, yet most capture cards do support native inputs of 120Hz or 144Hz. This guide is mainly for streaming when using a dual PC setup and a high refresh rate monitor.

Fret not, there is a solution.

This guide assumes you:

• Are using a Nvidia GPU
• Have DisplayPort Cable
• Have a HDMI cable
• Have a 144Hz monitor
• Use a Elgato HD60 Pro (or HD60)

Hardware setup:

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Nvidia GPU ->	DisplayPort to monitor
	HDMI to HD60 Pro

Software setup

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1. Right click somewhere on your desktop
2. Click on Nvidia Control Panel
3. This will open the Nvidia Control Panel.
4. On the left sidebar, click on Set up multiple displays
5. In the select displays you want to use box, you should see your main monitor, and one called Elgato.
6. In the second box below, right click on the primary display, marked with a big 1.
7. Hover over clone with, and select display 2.
8. Now click apply at the bottom. Your screen may go black and flash, and a box will come up asking to keep the changes. Choose yes.
9. Now, on the right hand sidebar, click on Adjust desktop size and position.
10. Click on the main monitor at the top, and under scaling, choose no scaling, and set the scaling to GPU.
11. At the bottom, make sure the resolution is set to 1080p, and the refresh rate is set to 144Hz/120Hz
12. Now click on the Elgato monitor, and set it to No scaling, perform scaling on GPU.
13. Below, set the resolution to 1080p and the refresh rate to 60Hz.
14. On the right sidebar, click on Change resolution.
15. Click on your main monitor at the top.
16. In the resolution scroll box, scroll down and under PC, select 1080p.
17. You will also see a refresh rate box. Click on it, and select the appropriate refresh rate for your monitor(Either 144Hz or 120Hz).
18. At the top, click on the Elgato monitor. The resolution and refresh rate options should be grayed out.
19. Now click on Apply. Your screen may flash. Make sure to choose yes to Apply these settings.
20. Close the Nvidia control panel, and open the Game Capture HD software.
21. After a few moments, you should see your monitor, in the Game Capture preview.

You’re done. You can now play at 144Hz/120Hz and stream (or even record) at 60fps with your Game Capture HD60 Pro and HD60.

This same setup works with G-sync as well.