Texture issue

This issue ONLY appears inside buildings and under water:

Wherever lighting is, black flickering squares appear.

I have tryed fixing it by turning all graphic settings on low.

Restarting game.

Moving it from my SSD to HDD (Reinstalling).

Tryed both AMD 13.11 beta v7 and v8 drivers.

My specs are:

Motherboard: MSI Z77A-GD65

CPU: Intel Core i7 3770K 3.5GHz 8MB LGA1155

GPU: SAPPHIRE HD 7970 3GB Vapor-X Edition (11197-12-40G)

RAM: Corsair 8 GB DDR3-2133 Kit

What COULD be the cause of my problem?