This depends on your choices on which you want to play games. You can easily play games on normal resolutions on this PC but for playing games on higher resolutions and settings, believe me nothing is future proof and you can't get a future proof pc in 40k.
regarding this pc, XEON processors are not recommended for gaming. if you can buy yourself a i7 even 3rd gen, it would be better choice and will be more future proof and good for your use.
in 40k you can easily get yourself a i7-3770, mobo, 8gb ram, 500gb hdd, gtx 1050Ti or gtx 1060 if you arrange little bit more money.