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Dual U2417H, MST doesn't work when using an AMD R5 430, CentOS Linux 7.4

I've been searching for the specs on R5 430 to see what kind of MST support it has but i'm coming up short. The machine is a
Manufacturer: Dell Inc.
Model Number: OptiPlex 7050
Graphics Card:
Intel Corporation HD Graphics 630
AMD/ATI Radeon HD 8570/ R7 240/340 OEM
CPU: Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
OS: CentOS Linux release 7.4.1708 (Core)
Monitors: 2x Dell U2417H 

Would I need specific drivers or a MST HUB to get this working? MST works when using the on board video, but I would rather use the dedicated video card. 

Thanks in advance.

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