diff --git a/src/atombios_crtc.c b/src/atombios_crtc.c
index 4e2395f..6e46cce 100644
--- a/src/atombios_crtc.c
+++ b/src/atombios_crtc.c
@@ -226,6 +226,8 @@ atombios_crtc_set_pll(xf86CrtcPtr crtc, DisplayModePtr mode, int pll_flags)
 
 	if (IS_DCE3_VARIANT && mode->Clock > 200000) /* range limits??? */
 	    pll_flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
+	else if (IS_DCE3_VARIANT && mode->Clock > 150000) /* range limits??? */
+	    pll_flags |= RADEON_PLL_PREFER_HIGH_REF_DIV;
 	else
 	    pll_flags |= RADEON_PLL_PREFER_LOW_REF_DIV;