Recording League

Hello guys, i want to ask something, i want to record league. My PC Specs are: Core2Quad Q9650 4GB RAM R7 240 XFX 2GB. Its not much, but im proud of what i have, having in mind noone supports me, im on my own.Now ingame its locked on 60FPS Very High and never dropps. I tried few softwares that are free to test, but all of them slow down my game. Is there any good video capturing software that is low requirement, and still good for people to watch without puking couse of quality of the video. At least my settings to be Medium or MediumHigh. Looking forward to all recommendations and i hope u help me. Thanks all!!
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