- Oct 8, 2008
I do not know what tricks they use or whatever, but it did run at the native 4K per eye but could not maintain it. So whatever they did, it ran but not high enough.Hagrid, if you do the math, even a Titan RTX wouldn’t be enough to maintain 90fps if we are talking about a true 8K signal (4K per eye @90Hz).
As the Pimax 8K is not a "true" 8K device due to bandwidth limitations as to what can be pumped across a single video cable, the Pimax 8K headset's input is limited to 2560×1440 for each of its displays. This is then upscaled in the headset to display on its screens at their native 4K actual resolution.
So, the Pimax 8K just needs a card that can deliver two 1440p (2K) signals @ 90Hz each which is pretty much the equivalent of a 4K signal @ 90Hz.
A single 2080Ti can manage 4K @ 60Hz but would be hard pressed to deliver 90Hz. A Titan RTX is only 10-15% faster, so also not quite up to snuff, but closer.
As long as graphics are dialed way back and/or foveated rendering is used to ease the rendering burden, then a 2080Ti should be enough for a Pimax 8K with their upscaling tricks - odds are the are also not going to do true 90Hz from the source signal but something like 75Hz or some other wonky tricks to get close or simulate it.
Right now, true 8k VR would require two 2080Ti’s at a minimum AND two video cable connections. The bandwidth of even the brand new VirtualLink connects couldn’t deliver what is required over a single connection as VirtualLink’s bandwidth for video is limited to only 32.4 Gbit/s... so it’ll handle up to 4K @ 120 Hz at best. At 8K the best it can deliver is 60Hz.
So for true next gen 8K VR, the real limitation here is the video channel throughput. What we need is HDMI 2.1 - something that NVidia hasn’t adopted just yet as it was just ratified. They should on thier next gen cards though... or with their 7nm Turing die shrink later this year. Unlike VirtualLink’s 32.4 Gbit/s, HDMI 2.1 can handle up to 48 Gbit/s as to bandwidth, and with display stream compression is good for 8K @ 120 Hz.
I do not know what tricks they use or whatever, but it did run at the native 4K per eye but could not maintain it. So whatever they did, it ran but not high enough.
The math is good if you know exactly what they are doing and how they are doing it. I know neither. Just from what I read on their testing.
Ahh. It's the Pimax 8K X that I was reading about.WUT? Did you not read my post? Native 4K per eye @90Hz requires a 8K signal @90Hz. They are not displaying a native 4K signal per eye from source. They are simply upscaling. They even admit that they are upscaling. It’s only 4K across both eyes, not per.
One 4K screens per two eyes adds up to half-8K, not real 8K which is like 4 x 4K screens.WUT? Did you not read my post? Native 4K per eye @90Hz requires a 8K signal @90Hz. They are not displaying a native 4K signal per eye from source. They are simply upscaling. They even admit that they are upscaling. It’s only 4K across both eyes, not per.
I wonder if the 16 GB of memory running at 1 TB/s bandwidth on the Radeon VII will lend itself to boosting VR framerates on high resolution headsets like the Pimax units. Would it be the GPU processing speed that is currently the bottleneck or is it memory bandwidth?
Ya I have the 8K-X on order. This is two 4K displays side-by-side at 90 Hz (8K width, but only half 8K height).. So it would be half the bandwidth of an 8K display at 90 Hz. "8K" resolution is very high, exactly four times the resolution of 4K. 8.2m pixels versus 33.2m pixels.
Radeon VII have enough memory capacity and bandwidth to run two 4K panels at native resolution. Processing power on the other hand is definitely going to be an issue. It will be like trying to run single 4K screen at 90fps with half the ROPs and shader units.I wonder if the 16 GB of memory running at 1 TB/s bandwidth on the Radeon VII will lend itself to boosting VR framerates on high resolution headsets like the Pimax units. Would it be the GPU processing speed that is currently the bottleneck or is it memory bandwidth?
I disagree. I mean just look at their logo it has "π" in it. Ya know that Pi = 3.14 blahhhh thing. I believe it sounds like "Pie" Literary saying out loud "Pie Max"guys FYI it's pronounced "PEE-max" and it's utility is "PEE-tool"
I disagree. I mean just look at their logo it has "π" in it.
sorry, too obscure of a joke... I was just referring to some non-native english speaking people calling it "pee" instead of "pie"... and the fact that it's asian-made and they are weird like that... I want it to stick I think it's good marketing, I dunno... blahhhh indeadAre you sure it isn’t Dick-max and Dick-tool?
I'm curious to test drive a Pimax 5K+ to see how its 170 FOV (150-160 is considered sweet spot before too much distortion though) compares to 110 on Odyssey+ and othersI have a 5K+ at home that's been sitting unopened in its box for a couple of weeks now. I am a Kickstarter backer and Pimax was supposed to hold onto my headset until the base stations and controllers were ready as well. But they sent it to me anyhow because their organizational skill rivals that seen in a monkey shit fight at the zoo. I used to be really excited about the 8K and 5K+. But after so many delays, lies and just outright incompetence on their part, I am now completely MEH about the whole thing. I could pick up a used Vive set for the controllers/light houses, I suppose. For now though, I think I'll just shoot a PM to Kyle and see if he would be interested in me sending it to him to review. I know he was pretty big into his Vive setup awhile back and I haven't seen him post much in the way of VR lately.
I'm curious to test drive a Pimax 5K+ to see how its 170 FOV (150-160 is considered sweet spot before too much distortion though) compares to 110 on Odyssey+ and others
Also based on screenshots I've seen of the pixels 5K+ vs 8K, I'd probably rather get 5K+ if I was going to buy one since 8K is still using Pentile, not to mention 5K+ is easier to drive with 2080 Ti, and 8K isn't reading native 8K input (like 8K+ will) and is uprezzing anyway.
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Definitely would choose the 5K+ over the 8K right now if it were me, but a few big negatives here as well: Availability, reliability (both HW and SW), and that LCD pentile display blows chunks compared to what a good OLED screen can deliver.
Really hoping that Valve opens up a little with their plans as to VR hardware at GDC later this month. Would be nice if they gave a prototype demo and some target dates for their upcoming HMD, but then again this is Valve we are talking about and they tend to just like to sit and rake in cash these days instead of delivering anything to gamers. While their HMD is rumored to only have a FOV of 135, I bet the optics/lens system and screen hardware they've been working will be solid. I'd much rather take that and their knuckles controllers over what Pimax currently has. Just hoping Valve releases something by Summer.