Graphics card refresh rate issue.

gop

Hi folks,

I'm kinda stumped here. I have an AMD Radeon R7 360 gpu (latest drivers/software), which is connected to a denon 2300w avr, which is then connected to a samsung 55inch 4k HDR10  (1900 pqi) TV. My problem is that my comp (windows 8.1 64bit), doesn't seem to recognise the  refresh rate of the new 4k tv.

When I put the screen resolution at 1920/1080, the monitor properties allows me to go to 59hertz, when I change the resolution to 4k, I can only go to 30 hertz. I'm confused as to why this is so low for a tv with a high refresh rate. My older samsung 50 inch led tv could go to 60 hertz, according to the monitor properties.

What am I missing? The denon can upscale to 4k, yet this makes no difference to the refresh rate, whether it's on or off.

At present I can't use the 4k resolution as the refresh rate drops to 30hertz making the picture verry choppy.

Thanks in advance,

G

Greg Hook

Can your amp pass through the full 4K signal at 60hz?

EndlessWaves

HDMI 1.4 only has the bandwidth for 3840x2160 at 30hz. You'd need HDMI 2.0 which that GPU doesn't support as it's too old.

The Bonaire GPU came out in March 2013, HDMI 2.0 was finalised in September 2013. There's also a couple of years lead time to actually get a new standard into products, so the first GPUs from any manufacture that supported HDMI 2.0 didn't arrive until about 2015.

The Bonaire GPU did support that resolution and refresh rate and can output it through DisplayPort 1.2 so you could use a [email protected] capable Displayport 1.2 to HDMI converter if you wanted the full refresh rate.

Or swap the card for something newer like an RX550.

gop

Hi, firstly thanks for replying

Yes the denon can output at 4k at 60hz, however on reading Endless waves response, I realised, I'm using old hdmi cables from sky, so I'd reckon there 1.4. To this end i've orderd 2.0 from amazon. I know endless waves you say my gpu can't support 2.0, but i'm hoping the denon will do the processing if the gpu can't, and if the gpu still only shows 30hz in full 4k resoultion, then I'll look at a new gpu. Thanks for your replies, very helpful.

Oh, the hdmi converter, im not seeing one that can convert 1.4 to 2.0, can you sent me a link of what your referring to please?

G

EndlessWaves

HDMI versions apply to the devices. HDMI Cable types are standard speed, high speed, ultra speed etc. High speed is the cable standard for the maximum capabilities of both 1.4 and 2.0 devices. A new cable won't do anything.

Your TV is likely a better bet for motion interpolation if you want to try and invent the missing frames. Not many AVRs can do that.

Are you talking about my mention of a DisplayPort to HDMI converter?

DisplayPort is another type of video connection, an alternative to HDMI. It's widely used on computers, but rarely seen on TVs. It's generally a little in advance of HDMI in terms of feature support as it caters to shorter cable lengths (which gives it more bandwidth to play with).

So a DP 1.2 to HDMI 2.0 Active adapter capable of [email protected] would be something like the Club3D CAC-2070
Club3D DisplayPort 1.2 to HDMI 2.0 UHD Active Adapter

It doesn't make any sense to talk about converting HDMI 1.4 to 2.0. HDMI 2.0 devices are backwards compatible to they'll accept anything an HDMI 1.4 device can throw at them. And a converter can't make the output of your card higher bandwidth, it can only work on the signal once it's out of the card.

blackmesa8

It might be a good idea if you upgrade your G card even if its just minor upgrade that doesn't cost that much to one that has HDMI 2.0 out. I do not know much about Radeons not used them in years but i can give examples of Nvidia cards that might be a good idea.

GTX 960 or 970. Both of them have HDMI 2.0 out, 970 is faster but there still neither high end and shouldn't cost you much at all.
Nvidia GTX 1050 ti, again another not too expensive card that has HDMI 2.0 out.

There will be lower priced Radeons if you want another Radeon with HDMI 2.0 out but your have to look them up yourself or ask on the computer section on this forum about G card upgrade for HDMI 2.0 and say you want a Radeon. I am sure someone could help you even more then for Radeons.

gop

Thanks for your response. I checked the specs on the gpu box and on asus website , both of them say that card supports 4k monitors, so logically new 2.0 cables should allow me to have 4k resolution with 60hz?

G

gop

R7360-OC-2GD5   | Graphics Cards | ASUS United Kingdom

peahead

Hi

You will only get 4K 60Hz via the display port output on your card,the HDMI output on the R7 370 is limited too 4k 30Hz because its only version 1.4 so buying a cable which says it version 2.0 won't change anything.

You will need to buy an Active display port to HDMI 2.0 adapter like the one in the links.

https://www.amazon.co.uk/Plugable-DisplayPort-Supports-displays-3840x2160/dp/B00S0C7QO8/ref=sr_1_6?s=computers&ie=UTF8&qid=1552947989&sr=1-6&keywords=Active DisplayPort to HDMI 2.0 Adapter

Club3D 3m DisplayPort 1.2 Cable to HDMI 2.0 Active Adapter M/M

Make sure its a Active one as the non active ones are limited to 4K 30Hz.

EndlessWaves

3840x2160 monitors are virtually all equipped with DisplayPort inputs even now there's much more diversity and HDMI 2.0 is more widely available. You wouldn't have found a single model without a DisplayPort input back when that was written.

A cable cannot change the capabilities of your card's HDMI output.