M6700 with M4000M - HDMI cant see resolutions past 1080p/60hz

Recently upgraded my Dell M6700 from a K4000M GPU to an M4000M GPU.
Great performance gains but I'm experiencing a problem.

My K4000M used to be able to recognize the supported resolutions of my TV / Monitors properly. 4k @30Hz, 1080p @120Hz, 3440x1440@45hz, ect.

This new M4000M seems to be stuck at 1 max.... 1080p@60Hz. No matter what I try to do (stock Nvidia VBIOS, Stock Dell VBIOS, multiple driver versions, ect.). Same exact cable and port that was used with the K4000M setup. Only variable changes here are the GPU and the driver.

I cant find any drivers that don't install without INF modding so I think the issue is either a driver issue or a GPU issue.

Has anyone had any experience with this issue?

Thanks

 

Please try DP->HDMI 2.0 adapter. Any DP to HDMI adapter rated for 4K/60 should be adequate. You should be able to pick one up for less than $15.