A GTX1030 is designed specifically to push 4k panels and it is around $70 - 80.
Nope. Most of the GT 1030 cards have no DisplayPort connectors, so no 4K resolution possible. Afaik the MSI GeForce GT 1030 2G LP OC is the only card that has (only) one DisplayPort connector.
There are also single slot GTX 1050 (Ti and non Ti) cards from Inno3D.
If you need four DisplayPorts e.g. an NVIDIA Quadro P1000 is to consider.
Or two of the HP GT 630 (most similar to the old GT 120). Kepler = OS X compatible without Nvidia web drivers, each one with two DisplayPort 1.2 connectors. There are plenty of HP GT 630 on eBay.
NVIDIA GeForce GT630 DP (2GB) PCIe x16 ... - CNET Content Solutions
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