Mac Pro (Mid 2012) to Curved UltraWide Monitor

Hello everyone, I have an 21:9 Curved UltraWide Monitor (34")(WQHD) that has the resolution 3440 x 1440 and want to connect this to my Mac Pro (Mid 2012) through an Belkin 4K Mini DisplayPort to HDMI Adapter. I want to know since this is a 4k adapter will it still support the WQHD resolution after I connect it and also carry audio over as well not just a video signal. (Note: My current graphics card is an Radeon HD5770 1 GB so I know that supports up to 2560 x 1600 and I will be upgrading my card to support a higher resolution in the nearby future). If there is another adapter that will support my needs please refer them but for now I am hoping this Belkin 4k Mini DisplayPort will suffice.

Monitor Specs:

• Screen Size Class (diagonal) (Inputs/Outputs) : HDMI x 2 (Power): Type: Adapter
• Panel Type Headphone Out x 1 Input: 100~240v
• Color Gamut (CIE1931) Display Port x 1 Normal On(EPA 6.0): TBD
• Aspect Ratio Thunderbolt x 2
• Resolution
• Brightness (typical)
• Contrast Ratio(Original)
• Viewing Angle (CR≥10)
• Surface Treatment
• 34" Class (34.0" diagonal)
• IPS
• SRGB 99%
• 21:9
• 3440x1440
• 300 cd/m2
• 1M:1 (DFC)
• 178/178

Mac Pro (Mid 2012)

Apple Mac Pro 5,1 2012 Quad Core 3.2GHz

RAM 32 Gb

SSD: 512GB Crucial SSD

HDD: 2TB 7200rpm

OS X Yosemite