4K 60FPS = 8K 30FPS?

[zzzzzzzhhh]

Is this a stupid question? I just wanted to know if a card doing 60fps 4K can do 30fps 8K gaming, and if that's not how it works, how does it work?

[comicsansms]

8K is 4 times the pixels as 4K

Therefore, 8K 15FPS would be the same amount of pixels as 4k 60Hz.

[MedievalMatt]

3 minutes ago, Vespertine said:

Is this a stupid question? I just wanted to know if a card doing 60fps 4K can do 30fps 8K gaming, and if that's not how it works, how does it work?

Thats not how that works.  8K is 4 times more pixels than 4K which is 4 times more than 1080p.

 

so a 4K60FPS capable GPU would be doing about 15 FPS at 8K

[Oshino Shinobu]

That's not how it works. 8K is 4x as many pixels as 4K (33,177,600 vs 8,294,400) so the bandwidth required for 4K 60Hz is the same as for 8K 15Hz, not 30Hz. 

 

In terms of connection standards, 4K 60Hz can be done with DisplayPort 1.2 and HDMI 2.0 but 8K 30Hz cannot be done on either specification AFAIK. It would require DP 1.3/4 or HDMI 2.1 support, neither of which is certain if the card supports the previous standard. So, while something like a GTX 1080Ti, which should be DP1.3/4 compliant, may support 8K 60Hz at some point, just having current support for DP 1.2 does not mean it will support later versions. As for HDMI, it is a similar situation, but AFAIK there are no cards with controllers that are HDMI 2.1 compliant right now. 

[zzzzzzzhhh]

1 minute ago, MedievalMatt said:

Thats not how that works.  8K is 4 times more pixels than 4K which is 4 times more than 1080p.

 

so a 4K60FPS capable GPU would be doing about 15 FPS at 8K

 

2 minutes ago, Comic_Sans_MS said:

8K is 4 times the pixels as 4K

Therefore, 8K 15FPS would be the same amount of pixels as 4k 60Hz.

Oh, I forgot about that, thanks.

 

[MedievalMatt]

Just now, Vespertine said:

 

Oh, I forgot about that, thanks.

 

In theory (this is also not how this works in reality)  a 4K60FPS GPU, used in SLI at 8K could to 30FPS.  but that also implies that same SLI setup would to 120FPS at 4K.

[zzzzzzzhhh]

Just now, Sampsy said:

I also suspect that performance doesn't scale so linearly, especially if you happen to run out of VRAM rendering at 8k. 

If 8GB of VRAM is fine for 4K, 16GB with VEGA is fine for 8K right?

[TheKDub]

15 minutes ago, Vespertine said:

Is this a stupid question? I just wanted to know if a card doing 60fps 4K can do 30fps 8K gaming, and if that's not how it works, how does it work?

 

Not quite. 8K is 4x the resolution of 4K, so being able to run a game at 4K 60fps would translate to roughly 15fps at 8K.

[Damascus]

3 minutes ago, Vespertine said:

If 8GB of VRAM is fine for 4K, 16GB with VEGA is fine for 8K right?

Again, not really.  Remember, it's 4× not double so if 8gb is the minimum for 4k 32 is the min for 8k.

[zzzzzzzhhh]

1 minute ago, Damascus said:

Again, not really.  Remember, it's 4× not double so if 8gb is the minimum for 4k 32 is the min for 8k.

Forgot again, ha. Though I wouldn't say 8GB is the minimum, more like recommended.

[Damascus]

Just now, Vespertine said:

Forgot again, ha.

Honestly vega 16gb should do best out of the current offerings of mainstream gpu's anyways.

[ehhthing]

Here's how the math works out: 

4k: 3840 * 2160 = 8 294 400 pixels.

8k: 7680×4320 = 33 177 600

8 294 400 / 33 177 600 = 0.25

8k has four times the pixels of 4k. So if we assume perfect scaling then 4k 60fps = 8k 15fps.

[vanished]

The "8K is 4x 4K" has been beaten to death already so I'd just like to raise awareness of this too:

1 hour ago, Sampsy said:

I also suspect that performance doesn't scale so linearly, especially if you happen to run out of VRAM rendering at 8k. 

since yeah, an increase in framerate might not perfectly match a reduction in resolution, or vise versa.  In fact I know this for a fact since if you compare, for example, an R9 Fury to a similar card at 1080p, and then compare to that same card at 4K, they pull away from each other (well depending what you pick for the other card but yeah)

[kasugatei]

1 hour ago, Oshino Shinobu said:

In terms of connection standards, 4K 60Hz can be done with DisplayPort 1.2 and HDMI 2.0 but 8K 30Hz cannot be done on either specification AFAIK. It would require DP 1.3/4 or HDMI 2.1 support, neither of which is certain if the card supports the previous standard. So, while something like a GTX 1080Ti, which should be DP1.3/4 compliant, may support 8K 60Hz at some point, just having current support for DP 1.2 does not mean it will support later versions. As for HDMI, it is a similar situation, but AFAIK there are no cards with controllers that are HDMI 2.1 compliant right now. 

Current DP 1.4 cards are capable of 8k@30Hz output. GT1030 is capable of it so I believe that any other Pascal card is capable of the same.

I am not talking about gaming here but about video output only. In case of using DSC compression 8k@60Hz with HDR (as well as 4k@120Hz) is possible via DP 1.4, however, you need DSC decoder in your monitor (still not commercially available). More about DSC here http://www.vesa.org/wp-content/uploads/2014/04/VESA_DSC-ETP200.pdf

DSC is part of VESA standard (as well as DisplayPort) so this is not some proprietary mumbo jumbo. Unless Nvidia "reinvents hot water" with something of their own as they usually like to do.

 

Asus has already utilized this technology, so more about it here https://www.kotaku.com.au/2016/06/asus-will-apparently-have-the-worlds-first-144hz-4k-monitor/

[Mr.Meerkat]

2 hours ago, Damascus said:

Again, not really.  Remember, it's 4× not double so if 8gb is the minimum for 4k 32 is the min for 8k.

However if we look at current games, if a game utilises 4GB~ of vRAM @1080p, typically @4K it wouldn't use more than 6-7GB of vRAM which is less than double so...vRAM doesn't really scale linearly to resolution either  

 

However, we could probably expect the vRAM requirements to double for 8K if this tweaktown article has anything to do bout it...

http://www.tweaktown.com/tweakipedia/90/much-vram-need-1080p-1440p-4k-aa-enabled/index.html

[Lord Nicoll]

Linus said this on a NCIX tech tips video, he ran Shadows of Mordor on super sampling 4K, effectively 8K, he ran out of VRAM and the FPS tanked well below 15FPS. If you have the VRAM you'd probably get a little more FPS than 15 due to pixel engines optimisations and such, maybe 16 FPS, but if you don't you'd be on like 4 or 5 FPS