Can't choose 1440x900 resolution after eGPU has been installed

[Cathexis]

Hello, I just setup an eGPU built with GTX 950 and Asus X555LB (i7 5500U+8GB RAB). I connected an external monitor with 1440x900 resolution. I was able to use this external monitor perfectly on integrated GeForce GT 940M but after I have connected my GTX 950 through GDX Beast PCI-E adapter and drivers installed, I cannot choose 1440x900 resolution neither in Nvidia control panel nor in Windows menu. The OS is Windows 10, 64 bit. How can solve this problem? Thanks

[Tech Inferno Fan]

Check if 1440x900 is listed perhaps against a different refresh rate than your monitor is currently set for. A good guide explaining how to check is at http://www.tenforums.com/tutorials/4910-screen-resolution-display-change-windows-10-a.html