Hello All 
I cant seem to get my 4K (3840 x 2160p) tv to run at 60Hz and need help figuring out whats wrong.
Running a Quadro K4000 (has displayport 1.2) on Windows 7 (64bit) connected to my Sony XBR X900E. Used a display port 1.2 to HDMI 2.0 adapter with a HDMI 2.0 cable to connect to the TV using HDMI port #2.
The resolution is set through Nvidia Control Panel to 4K (3840 x 2160p) but the only option is 30Hz not 60Hz (unavailable in drop down).
I tried creating a custom resolution of 3840 x 2160p @60Hz. Windows says its successful when I hit "TEST". When it asks if I want to keep the setting I select "yes" and then the screen flickers black and reverts back to 3840 x 2160p@30Hz
Maybe I dont understand the custom resolution menu or does Window 7 require other settings?
Also, the cable specs all say they support 4K@60Hz. So I dont think its them.
The Quadro K4000 supports 4K@60Hz & so does the TV. I even have everything plugged into HDMI port #2 per rtings.com review (see below). Maybe I need to make sure "HDMI Enhanced" is enabled on the TV somehow.
HARDWARE SPECS BELOW
Quadro K4000
https://www.nvidia.com/content/PDF/data-sheet/DS_NV_Quadro_K4000_OCT13_NV_US_LR.pdf
Max DP 1.2 Resolution 3840 × 2160 at 60Hz
Max DVI-I DL Resolution 2560 × 1600 at 60Hz
Max DVI-I SL Resolution 1920 × 1200 at 60Hz
Max VGA Resolution 2048 × 1536 at 85Hz
Cirago DisplayPort to HDMI Ultra HD 4K Display Adapter
color=#123456]http://www.frys.com/product/9101298?site=sr:SEARCH:MAIN_RSLT_PG[/color]
DP to HDMI 4K Active Adapter
4K Ultra HD , 3D support
HDMI 2.0 (female); DP 1.2 (male)
Supports up to 3840 x 2160, 60Hz
HDMI 2.0 UHD 4k Cable
http://www.frys.com/product/8944193?site=sr:SEARCH:MAIN_RSLT_PG
Premium Certified HDMI
4K Ultra HD 60Hz
Supports higher bandwith up to 18Gbps
Tested to full 18Gbs and with EMI test
Fully Supports 3D 4K@60Mhz and HDR, 2160p
Sony Bravia XBR X900E
https://www.sony.com/electronics/televisions/xbr-x900e-series/specifications
4096 x 2160p (24, 60 Hz), 3840 x 2160p (24, 30, 60 Hz), 1080p (30, 60 Hz),
Motionflow™ XR 960 (native 120 Hz)
http://www.rtings.com/tv/reviews/sony/x900e
"This TV supports all of the common input signals. Only HDMI inputs 2 and 3 are capable of showing 4k @ 60 Hz @ 4:2:2 or 4:4:4 color, and only when 'HDMI Enhanced Format' is enabled. 4:4:4 color is supported in both game and graphics mode....HDMI 2.0 Full Bandwith : Yes (HDMI 2, 3)"
I cant seem to get my 4K (3840 x 2160p) tv to run at 60Hz and need help figuring out whats wrong.
Running a Quadro K4000 (has displayport 1.2) on Windows 7 (64bit) connected to my Sony XBR X900E. Used a display port 1.2 to HDMI 2.0 adapter with a HDMI 2.0 cable to connect to the TV using HDMI port #2.
The resolution is set through Nvidia Control Panel to 4K (3840 x 2160p) but the only option is 30Hz not 60Hz (unavailable in drop down).
I tried creating a custom resolution of 3840 x 2160p @60Hz. Windows says its successful when I hit "TEST". When it asks if I want to keep the setting I select "yes" and then the screen flickers black and reverts back to 3840 x 2160p@30Hz
Maybe I dont understand the custom resolution menu or does Window 7 require other settings?
Also, the cable specs all say they support 4K@60Hz. So I dont think its them.
The Quadro K4000 supports 4K@60Hz & so does the TV. I even have everything plugged into HDMI port #2 per rtings.com review (see below). Maybe I need to make sure "HDMI Enhanced" is enabled on the TV somehow.
HARDWARE SPECS BELOW
Quadro K4000
https://www.nvidia.com/content/PDF/data-sheet/DS_NV_Quadro_K4000_OCT13_NV_US_LR.pdf
Max DP 1.2 Resolution 3840 × 2160 at 60Hz
Max DVI-I DL Resolution 2560 × 1600 at 60Hz
Max DVI-I SL Resolution 1920 × 1200 at 60Hz
Max VGA Resolution 2048 × 1536 at 85Hz
Cirago DisplayPort to HDMI Ultra HD 4K Display Adapter
color=#123456]http://www.frys.com/product/9101298?site=sr:SEARCH:MAIN_RSLT_PG[/color]
DP to HDMI 4K Active Adapter
4K Ultra HD , 3D support
HDMI 2.0 (female); DP 1.2 (male)
Supports up to 3840 x 2160, 60Hz
HDMI 2.0 UHD 4k Cable
http://www.frys.com/product/8944193?site=sr:SEARCH:MAIN_RSLT_PG
Premium Certified HDMI
4K Ultra HD 60Hz
Supports higher bandwith up to 18Gbps
Tested to full 18Gbs and with EMI test
Fully Supports 3D 4K@60Mhz and HDR, 2160p
Sony Bravia XBR X900E
https://www.sony.com/electronics/televisions/xbr-x900e-series/specifications
4096 x 2160p (24, 60 Hz), 3840 x 2160p (24, 30, 60 Hz), 1080p (30, 60 Hz),
Motionflow™ XR 960 (native 120 Hz)
http://www.rtings.com/tv/reviews/sony/x900e
"This TV supports all of the common input signals. Only HDMI inputs 2 and 3 are capable of showing 4k @ 60 Hz @ 4:2:2 or 4:4:4 color, and only when 'HDMI Enhanced Format' is enabled. 4:4:4 color is supported in both game and graphics mode....HDMI 2.0 Full Bandwith : Yes (HDMI 2, 3)"
Does this mean I need to keep the TV display mode in "game" or "graphics" mode or 'HDMI Enhanced Format' to get 4k 2160p@60Hz?
Do have a hardware problem?
Windows setting issue?
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