Imac 27 mid 2010 as gaming monitor

Hi guys, i have an imac 27 mid 2010, my question is:

with a gaming pc with gtx 980 with display port, and with this http://www.amazon.it/StarTech-MDP2DPMM1MW-Adattatore-DisplayPort-Maschio/dp/B008 1ZBW9O/ref=sr_1_4?ie=UTF8&qid=1455040792&sr=8-4&keywords=Mini+DisplayPort+to+Dis playPort

can i use my imac as gaming monitor with full 2560x1440 resolution?

Sorry for bad english

Thanks