Texture flickering with ultimate pack

[robbversion1]

Maybe someone can help me with this flickering problem i've been having ingame. Just put ultimate pack on my server and i've been playing for a day or two. While playing i'm getting weird flickering of textures. I've tried everything I could think of. I've updated to the latest java, have the latest optifine (changed various settings), updated video drivers.

Seems its only happening with this pack. The direwolf20 pack seems to be just fine. I'll post some screenshots below.

 

[Booker The Geek]

DO you get the same thing happening when you play without optifine or texture packs?

 

[robbversion1]

tried it without optifine and it looks just fine. put it back on and flickering was back. so i guess optifine doesnt like something in this pack

 

[Daemonblue]

Do you have multi-core turned on? I tend to have trouble with it myself.

 

[robbversion1]

oh wow. i think that might have done it. 'default' and 'smooth' definitely look better. i would have gone crazy going through each optifine setting trying to figure out which was causing it. thanks.