Having issues with the world de-rendering

[Yiazzy]

Recently installed the pack, and added a few mods (Forestry, Binnie mods, Tinkers Contruct and NEI Addons), and after random periods of time my screen starts flashing and entire chunks of the world around where I'm stood completely de-render. The blocks persist as I don't fall through the world, but the game becomes unplayable as I can't see any blocks around me to move. 

I've tried setting my Java from 64-bit to 32-bit, my RAM from 1gb upto 7gb, changed all the video settings for lowest performance and nothing helps.

How can I fix this issue, I'm only managing about 5 minutes most before it does this again?