Is there a way to check which HDMI version a computer contains?
Is there a way to check which HDMI version a computer contains?
On Thu, 8/22/2024 12:35 PM, Bill Bradshaw wrote:
Is there a way to check which HDMI version a computer contains?
On Fri, 8/23/2024 6:24 PM, Paul wrote:
On Thu, 8/22/2024 12:35 PM, Bill Bradshaw wrote:
Is there a way to check which HDMI version a computer contains?
This device is discontinued, but it represents an example of
an output tester. It is not capable of testing at the very latest
standard, but it's still pretty good for what it does and
the price. But presumably the chip inside it is using, either
cannot be obtained, or there was some issue with HDCP keys it
was using. I don't know if you can extract all the parametrics
from a signal, while HDCP is running (encryption) and you don't have
keys to use.
https://www.siig.com/hdmi-meter-tester-with-digital-indicator.html
The other way to do it, is pass the signal to an AV Receiver,
but if you do that, maybe the downstream EDID affects the
rates it tries to run at ? It should not have a particular
reason to be asking for 8K at 120Hz. But apparently, the
display on the AVR can give some details about an HDMI plugged
into it.
Looking up the video card, is a possible way to do it, but the
driver and the internal operation of the device (bad crossbar
design on an iGPU) means there is still some risk when you
get your shiny new LCD monitor, that the desired rate just
isn't there.
An iGPU, it was estimated in the past that it would use
1GB per second of memory bandwidth, to drive some outputs.
You would have to do the math, to figure out what the impact
would be, of an extravagant format. A PCIe video card on the other
hand, has a couple hundred GB/sec bandwidth to the VRAM, so
the crossbar has a rather unlimited bandwidth to work with.
You could, for example, run three 4K monitors in Eyefinity.
Computer games think it is a special monitor which is 11520 wide.
On some recent card, it was claimed the crossbar counter
went up to 16K or so. Three 8K monitors would be unlikely
to work as a panorama, until the crossbar is made even wider.
It's possible the fastest low amplitude signal at the moment
is USB4 at 120Gbit/sec. I don't think video outputs are there yet.
And video outputs are forced to operate over longer distances
than perhaps a USB4 would. I doubt USB4 cables will be allowed
to be super-long. Even if it has preemphasis, the attenuation
is just too high for miracles to happen.
Paul
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