I can't change the refresh rate on my Monitor

[btaki]

I'm running a Iiyama Vision Master 510 on a radeon X600 SE, I can't change the Refresh rate above 75Hz on any resolution But 1600*1200 (85Hz), I've tried it with a X850XT and a X300Se and I still have the same problem.

 

[corkyg]

According to the Display specs in this review, refresh rates are preset to specific resolutions.

510

You may have a defective one. Check with Iiyama.