[joevt]

What graphics card are you using?

You need two cables, a DisplayPort 1.2 cable and a HDMI 2.0 cable. You say both work at 4K 60Hz? What 4K 60 Hz display did you test with the HDMI cable (since the Benq bl3201pt only supports 4K 30 Hz via HDMI 1.4)?

The opto-media CMV-535 has a power supply that needs to be connected. Does the blue LED power indicator light up?

The opto-media CMV-535 has two dip switches to select between 4 different EDID settings. I’m using OFF-OFF (OFF = up position) to get 4K 60Hz from my Nvidia Titan X HDMI 2.0 port to a Dell 4K display’s DisplayPort input. Any setting should be able to get something to display from Windows 10.

OFF-OFF = 3840×2160 60Hz
ON-OFF = 4096×2160 60Hz
OFF-ON = 3840×2160 30Hz
ON-ON = 1080p 60Hz

It’s possible that we might have two different firmware versions. I would like a firmware updater where I can modify the EDID settings myself.

[joevt]

Mu7ammad’s last picture (in the google drive link) has the 8K display’s overlay picture clearly showing 3840×2160,60Hz on the bottom right corner.  I believe the image on the screen is from an X Box One (those are X Box games being pictured).

The overlay says “DP Capability: DP 1.4”. I don’t know if that refers to the adapter or the display. A test from a DP 1.2 computer, DP 1.2 adapter, or Thunderbolt 3 port might port clear that up (since Thunderbolt 3 doesn’t support DP 1.4 yet).

I think the partilink and opto-media converter boxes might have more chips than the gamintech adapter? They are bigger. The opto-media one has two relatively large chips. Maybe the gamintech one has a chip at both ends? I wouldn’t try opening it myself. People use x-rays for this kind of investigation.

[joevt]

Mu7ammad posted pictures (link in an above post) of the HDMI 2.0 adapter he got from gamintech. It looks like my HDMI 1.4 adapter from StarTech instead of the HDMI 1.4 adapter on StarTech’s website or the HDMI 2.0 adapter on gamintech’s website.

This is more evidence that StarTech and Gamintech are using the same Chinese manufacturer? Is it possible that the adapters are the same, except the Gamintech one is overclocked to support HDMI 2.0 input? Maybe overclocking causes the overheating problem reported by Mu7ammad? Maybe that’s why StarTech doesn’t sell a HDMI 2.0 version?

The converter I have has heatsinks on the chips and has a metal shell also used as a heatsink. The Gamintech/StarTech adapters just have plastic shells.

[joevt]

Looks like gamintech updated their website. The image of their HDMI 2.0 to DisplayPort 1.4 converter has been updated.
https://gamintechshop.weebly.com

Their converter looks like HDMI 1.4 to DisplayPort 1.2 adapters I’ve tried in the past where it uses USB for power. It’s most similar (or exactly the same) to the one from StarTech. StarTech has a sticker on the HDMI connector on the underside (shown blank in the gamintech picture). It’s possible StarTech is using the same Chinese manufacturer except gamintech somehow gets an HDMI 2.0 version?

Curiously, the one I have from StarTech doesn’t match the image on the StarTech website (the shape of the plastic around the DisplayPort connector is different – mine is rectangular, has no grip lines, and has slightly convex top and bottom surfaces with no markings).

[joevt]

I only tried the opto-media one.

The partilink one might be interesting – it will output to two DisplayPort displays but I don’t think any of us need that feature. It says it will transmit at least stereo audio over DisplayPort which will be useful if your DisplayPort display has audio (the LG31MU97 doesn’t have audio).

The opto-media converter extracts audio to analog RCA or digital S/PDIF instead and does not output audio on DisplayPort. This feature doesn’t matter in the case of the PS4 Pro because the PS4 Pro also has a separate audio output.

The prices are about the same (i.e. very expensive).

[joevt]

The spec sheet for LG31MU97 says it supports 4K at 30 Hz on HDMI.

If the PS4 Pro won’t do 4K at 30 Hz (because Sony doesn’t like you or they think it makes games look bad), but will do 4K at 60 Hz (because Sony wants you to buy a new display), then you need to use the DisplayPort connection of the LG31MU97 to do 4K at 60 Hz.

To use the DisplayPort connection of the LG31MU97, you need to use a HDMI 2.0 to DisplayPort 1.2 converter, like the ones we’re discussing in this thread.

I don’t have a PS4 Pro to test my HDMI 2.0 to DisplayPort 1.2 converter.

[joevt]

Partilink was mentioned on page 4 of this thread.

There are very few displays that use DP 1.4. The Dell 8K display does. DP 1.4 allows 4K at 120 Hz or two 4K at 60 Hz. 8K requires two 3840 x 4320 60 Hz connections which means using two DP 1.4 cables (8K is four times larger than 4K).

HDMI 2.0 can’t do more than 14.4 Gbits/s. DisplayPort 1.2 allows slightly more at 17.28 Gbits/s so there’s no point in using DisplayPort 1.4.

I think any DisplayPort 1.4 display that exists in the future will work fine with a 4K 60Hz DisplayPort 1.2 signal.

[joevt]

I hope they changed it, because the device they pictured is this:
https://www.c2g.com/uk/product/80928/displayport-to-hdmi-vga-or-dvi-adapter-converter#support
which is a DisplayPort to HDMI 1.4, VGA, DVI adapter.

I would like to see a url to their webpage that explains their converter.

[joevt]

The CMV-535 data sheet does say “Supports HDCP 1.4 & 2.2”. Do you think Netflix on PS4 would be a good test?

[joevt]

They have a contact e-mail on their website [email protected]
I just sent an e-mail with subject sales information expressing my interest in purchasing the product and to please send pricing and availability information. They may ask for company name, contact information, and shipping address. I said I would purchase one unit for personal use. Then they’ll give you a quote. Then I said the price is acceptable and can they please send a PayPal invoice to my PayPal account (having my e-mail address). They’ll also kindly answer questions about the product’s capabilities. Maybe if you say you want to pay using PayPal upfront (and give all the info they need) then they’ll skip the quote step? PayPal was a new thing for them so hopefully they’ll continue to use it. It sure is convenient.

[joevt]

I’m not sure how I would check for HDCP behavior. I was able to use a Motorola cable box and to play a DVD from a PS4. What should I try?

[joevt]

My P2715Q has 4K 60Hz enabled by default on HDMI. I tried this on my P2415Q which had only 4K 30Hz enabled on HDMI. It worked after a couple tries (4K 60Hz over HDMI). The thing that was weird is that the Enable and Disable option didn’t redraw when I pressed up or down but you can see the selection has changed when you go into the option again. The cable needs to be unplugged on the PC side, you can leave it plugged in on the monitor side.

[joevt]

Lag would only be possible if the converter saved entire frame buffers which would require lots of RAM as well. I think it just converts on a per pixel basis so there’s no way to add lag. What kind of converter do you know that adds lag? Maybe scalers?

[joevt]

7) Also tested successfully with a Motorola cable box (1080p).

[joevt]

I’ve tested the CMV-535 successfully with the following:
1) PS2 with Component Video to HDMI adapter (480i)
2) PS4 (only 1080p; you need a PS4 Pro for 4K)
3) Nvidia Titan X (Maxwell) HDMI 2.0 port
4) Z170X-Gaming 7 HDMI 2.0 port (from Intel graphics)
5) Club 3D CAC-1070 DisplayPort to HDMI 2.0 adapter from Nvidia and Intel graphics (redundant but interesting)
6) Plugable.com USB-C to HDMI 2.0 adapter from Intel graphics (also redundant)

OptoMedia said they were working on a firmware update for the end of January to fix a little compatibility issue with the Xbox One. I don’t know what the issue is.

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