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Intrinsic on 25 March 2020
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HoloDust said:
Intrinsic said:

Lol... to be fir the Power prediction was easy. All I had to do was double the power of the PS4pro/XB1X.My guess was that they would just jump to being 80CU parking APUs, but somewhere below that but benefit from running at higher clocks. My SSD talk though had some saying I was crazy and unrealistic.

Or do what many did back when PS4 launched - 1.84TFLOPS x8 for about the same jump from 7th to 8th gen, not counting architectural improvements.

Sad thing is, XSX and PS5 achieve this only after taking architectural imrpovements into account, and all that while having to handle 1.78x more pixels, if devs are crazy enough to chase 4K native.

The issue is that there is a lot of generalization going around and people don't really take what these machines actually do need into consideration. Lets paint a cerian picture.

Ihave edited my originalpost to give a more accurate depiction of what really happens.

PS4 running game at 1080p@30fps. 33ms render time with its 1.8TF. Going by steps.

  1. CPU pre-renders the frame and has 33ms to do this. Then passes the results to the GPU.
  2. The GPU then uses those results and completes the frame. It to has to do this in under 33ms. While the GPU is working the CPU is pre-rendering the nxt frame.
  3. Rinse and repeat.

Now not everything scales with resolution. But for certain is that if you double the rez, and this gets a little tricky. Say you want to g from 2Mpx (1080P) to 4M px.

  • CPU workload increases by ~20%. GPU workload increases by 100%. You are trying to render exactly twice the pixels.
  • Now you need a slightly faster CPU and at least 3.6TF GPU. Or ain't so much faster CPU and maybe like a 4TF GPU. So while the CPU is taking more time do its work, the more powerful GPU is doing its own in less time.

Now you want to bump up to 8M px(native 4k). You need another 30% bump to your CPU and another 100% bump to your GPU bringing your GPU TF to around 7.2TF.

But he CPU and GPU in the PS5/XSX is significantly more powerful (or efficient) that whats in the PS4. The CPU is like at least 400% better, and the GPU TF is at least 65$ better.

So the PS5/XSX would need around 3TF to render that same game at native 4K@30fps and around 6TF to do it at 60fps.

Last edited by Intrinsic - on 25 March 2020