R7 260x screen flickering on Crimson 15.7.1

I just bought my new gpu today and after installing the screen was flickering, was playing bf3 for a while and sisnt notice it but when back to desktop the screen was flickering around the edges near the windows logo. I am on the latest Radeon Crimson Software 15.7.1, and my current specs are

Windows 8.1 Update 1
Asus m5a78l m le
Athlon II x2 260
Hyperx fury 4gb 1866(@1333mhz)+2gb kingston generic 1333
Wd caviar black 500gb
And Corsair CX 430w
Sapphire r7 260x OC

And monitor is a old crt from 2007.

My card had a vga port so plugged the monitor into vga.
And my new cpu would be fx 4300 and new mobo ga-78lmt-usb3 along with a 4gb ram stick, which are yet to be delivered. Now anu solutions? Monitor refresh rate is at 85 and changing it doesnt help.