Hi Daniel, the document below lists 60Hz as the maximum refresh rate supported.
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@ dh2, Following is the information on 144Hz support that should help you configure your system.
When using DVI:
Intel HD Graphics 4600 Does not support Dual DVI natively (however DP to Dual DVI Active Dongle might work- but not supported ) and Max Pixel Clock is supported on Single Channel DVI is 165Mhz.
So max on DVI at 1920 x 1080 is 60p Hz.
Intel HD Graphics 4600 Max Pixel Clock supported on HDMI is 300Mhz. So max on HDMI at 1920 x 1080 is 60p, 85p,100p, 120pHz.
Note : 1920 x 1080 (144p Hz) is not supported on HDMI as it Exceeds the max Pixel Clock supported by our Intel HW ( 300Mhz)
Driver will enable and support 300Mhz based on HDMI Panel’s (HDMI Registration ID supplied by panel )
When using DispalyPort :
Intel HD Graphics 4600 Max Pixel Clock supported on DisplayPort Various based on SKU - ( Based on CD Clock of the SKU – Which is OEM setting via System bios.)
So based on what the BIOS has enabled, at 1920 x 1080, 60p, 85p,100p, 120p,144pHz are supported.
We tested based on your configuration and found the following:
With DisplayPort, working fine on DisplayPort Interface ,Which means we are able to see and apply 1920 x1080 @ 144Hz without any issue..
Above is from our CUI. Driver used : 10.18.10.3618 ( Dated 5/12/2014 )