Xemko :
http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_980_ti_g1_gaming_soc_review,8.html
System Wattage with GPU in FULL Stress = 341 Watts - with i7 5960x OC.
Probably, since you are not overclocking, i5 4690 non K. Perhaps, on the edge.
How does a full system with 5960x under full load and a 980 ti = 341 watts?
Your own link quotes this
"Power Consumption
Much like the GM200 Maxwell GPU harbored in Titan X, this GTX 980 Ti is rated as having a 250 Watt TDP, our measurements back that up, bear in mind that this is a peak maximum value under full stress. At this performance level you are looking at a card that consumes roughly 450 Watts for the PC in total, that is okay. We think a 600~650 Watts PSU would be sufficient and, if you go with 2-way SLI, an 850~950 Watts power supply is recommended. Remember when purchasing a PSU, aim to double up in Wattage as your PSU is most efficient when it is under 50% load. Here again keep in mind we measure peak power consumption, the average power consumption is a good notch lower depending on GPU utilization. Also, if you plan to overclock the CPU/memory and / or GPU with added voltage, please do purchase a power supply with enough reserve. People often underestimate it, but if you tweak all three aforementioned variables, you can easily add 200 Watts to your peak power consumption budget."
http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_980_ti_g1_gaming_soc_review,36.html