I am glad you were there to tell me that because this is an issue nobody could ever fix… I mean aside from Intel ofcourse…
As for this Issue, does it happen without GregTech too? Try running Minecraft 1.7.10 without any Mods, that might help.
And if that doesn’t help then uhh I have no Idea… maybe Optifine fixes it somehow? Probably not but its worth a try at least.