That Seasonic might be a higher quality unit if you are looking to buy a PSU (or the lower priced S12II 520, for that matter).
If you already own the DeepCool PSU you were asking about though, it would probably work fine. Even the most power-hungry of those cards (the RX 580) uses just over 200 watts at full load, and combined with the rest of the system probably wouldn't ever need more than around 350 watts from the PSU. That PSU also apparently comes with two 6+2 pin PCIe power connectors, which should be enough connections for any single graphics card.