Currently have a Intel DH67BL motherboard with i3-3225 cpu and 8gb DDR3 ram. Recently put in a SSD and saw a large performance boost. This PC would be for my my kids are who only interested in Minecraft/Roblox and school stuff/web-browsing . I would rather not upgrade the MB/ram etc....the power supply is fine. I'd rather stick with onboard graphics and not use a gpu. Would going with a used i7-3770 for about $75 be a worthwhile upgrade or would I not really notice any improvement on the above listed applications?