It's not too weak,he already does record with it and only complains about the quality,if it were too slow he would get choppy video.
But most important,nemesis you have a 960 wich supports shadowplay just use that (geforce experience) to record your gameplay,use a custom setting and lower the bitrate to around 15,000 kbit for 1080/30FPS to lower the risk of your HDD not being fast enough and also to keep the filesize down.