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Low-end GPUs are a very poor value proposition. For $89 you could have an RX 460 with nearly 3x the performance of the R7 250 plus HDMI 2.0b and DisplayPort 1.4.

What is the added value of 5 times more than enough compared to 2 times more than enough?

The R7 250 is considerably less than enough if you have a 4k monitor. GPUs aren't just for gaming - if you use Photoshop or Premiere, you'll want a decent GPU. An increasing number of applications are making use of GPGPU processing.

The R7 250 doesn't have a single 4K output, nevermind the two he needs. For 4K you need Displayport 1.2 or HDMI 2.0.

(Technically HDMI 1.4 also supports 4K but only at 24hz, which is fine for TVs but a miserable experience on a PC desktop)

As other commenter said, none of the cheap GPUs come with DisplayPort I need to drive my current 34" UWD display or future 4K displays :/