looks like it can't do 4k. 2560x1600 is the max resolution according to nvidia website. Don't know why they won't support it. But I don't care.

There seems to be a lot of confusion. Some specs say it is, others say it isn't. Has anyone actually tested it with the actual card yet?

callsignvega

HDMI is a horrible low bandwidth interface. Can't even do 1080P @ 120Hz. It can do 4096x2160 at 24 Hz. So about the bandwidth of two Styrofoam cups tied together with a piece of string.   

 
Low bandwidth?
HDMI supports up 10.2 Gigabit/s bandwidth.  That's plenty.  The reason for it not supporting certain resolutions and refresh rates such as 1080p at 120Hz is not due to a lack of bandwidth.

The GTX 680 supprts 1.4/a...so technically yes, but as callsignevga stated, at only 24hz.
 
Here is a comparison of 24Hz vs 60Hz to give you an idea
 

nerd101

The GTX 680 supprts 1.4/a...so technically yes, but as callsignevga stated, at only 24hz.

Here is a comparison of 24Hz vs 60Hz to give you an idea

Part of that however is due from the frame rate that the camera is recording at. If the camera was set to record at 24Hz ± a few Hz, it'd definitely have that effect, and magnify it. For example:
 

 
 It's the frame rate of the camera and the frequency of the water (via the speaker) being matched exactly that causes the water to "hang" like that. When the sine wave frequency is incremented/decremented, the two will be out of sync, causing the stream of water to either appear to go back up into the tube, or fall down faster. Sadly, in person, this would just look like a normal water stream. This happens at whole number ratios of each frequency. 1:1, 2:1, etc.

It's the same effect as what happens on car commercials sometimes. The car is obviously moving, but you are able to exactly see the slow rotation of the wheel, despite the car traveling quickly, either in the opposite direction the car seems to be traveling, or in the direction of travel 

SirMaster

callsignvega

HDMI is a horrible low bandwidth interface. Can't even do 1080P @ 120Hz. It can do 4096x2160 at 24 Hz. So about the bandwidth of two Styrofoam cups tied together with a piece of string.   

Low bandwidth?
HDMI supports up 10.2 Gigabit/s bandwidth.  That's plenty.  The reason for it not supporting certain resolutions and refresh rates such as 1080p at 120Hz is not due to a lack of bandwidth.

 
That's plenty (340 MHz)? That's slower than a VGA cable (388 MHz). 
 
Display port 1.2 is the only interface that can reasonable do higher resolutions/refresh rates that we can see coming out in the future. It has almost twice the bandwidth as HDMI 1.4. 
 
Oh and HDMI's woeful bandwidth is exactly why it cannot do 1080P @ 120Hz. That = 373.2 MHz. I state once again HDMI is designed for mainstream TV use and it's band width is garbage. 
 
http://www.csgnetwork.com/videosignalcalc.html

HeavyHemi

SirMaster

callsignvega

HDMI is a horrible low bandwidth interface. Can't even do 1080P @ 120Hz. It can do 4096x2160 at 24 Hz. So about the bandwidth of two Styrofoam cups tied together with a piece of string.   

Low bandwidth?
HDMI supports up 10.2 Gigabit/s bandwidth.  That's plenty.  The reason for it not supporting certain resolutions and refresh rates such as 1080p at 120Hz is not due to a lack of bandwidth.

Eh...1920X1080 at 24hz is nearly 7Gbits/sec. Do the math.

 
OK?  I've done the math:
 
HSYNC: 1920+280 (horizontal blanking pixel No.)
VSYNC: 1080+45 (vertical blanking line No.)
Total pixel per frame = 2200x1125 = 2.475 Mpx/frame
Bit rate = 2.475 Mpx/frame x 24 (= 3x8) bit/px x 24 frame/s = 1.4256 Gbit/s
TMDS: 8 bit -> 10 bit
TMDS bit rate = 1.4256 Gbit/s x 10/8 = 1.782 Gbit/s
 
1920x1080 24Hz 24bit = 1.782 Gbit/s
1920x1080 60Hz 24bit = 4.455 Gbit/s  
1920x1080 120Hz 24bit = 8.910 Gbit/s
 
So as you can see, the 10.2 Gbit that HDMI can support is plenty, even for 1080p 120Hz.  It's not limited by the bandwidth.  HDMI is far from a "low bandwidth interface"
 
There are even some manufacturers selling HDMI cables that support up to 15.8 Gbit/s, but they aren't currently a part of any HDMI standard.

HDMI only goes up to 340 MHz un single link mode (which virtually all devices are). 340 MHz is not enough for 1080P @ 120 Hz. Why do you think there are no devices that run 1080P @ 120Hz. They though they would put that restriction on just for the hell of it?
 
An example is the recent Samsung 3D displays that have HDMI and DP. Only DP allows 120Hz, HDMI can only do 60 Hz on the same deisplay.