Playstation 5 [PS5] [Release November 12 2020]

[ChuckeRearmed]

"Bomba surprise that Sony likely cut down the 256-Bit FP pipes to just 128-Bit."

What are the benefits of that?

 

[BRiT]

What are the benefits of that?

Make's it skinnier.

 

[iroboto]

"Bomba surprise that Sony likely cut down the 256-Bit FP pipes to just 128-Bit."

What are the benefits of that?

uses less silicon. Makes it smaller.

 

[ChuckeRearmed]

Make's it skinnier.

Damn, imagine how big PS5 would be if it had 256, if it is now that big with 128

Spoiler

 

[Globalisateur]

So no unified L3 cache? I guess we can all blacklist RedGamingTech now.

 

[chris1515]

So no unified L3 cache? I guess we can all blacklist RedGamingTech now.

Yes I am happy he is caught to have a bad source.

 

[Globalisateur]

Sony seem to have removed the FADD blocks.

https://twitter.com/x/status/1361056090943807491

 

[Kugai Calo]

SSE is probably just fine consider games mostly deal with vector of length 4, and workload with heavy FP operations will be offloaded to GPU instead. But AVX is always handy if your workload is smaller and requires low latency.

 

[Tabris]

I like how they make the Geometry Engine in the center of the GPU block.

 

[vjPiedPiper]

SSE is probably just fine consider games mostly deal with vector of length 4, and workload with heavy FP operations will be offloaded to GPU instead. But AVX is always handy if your workload is smaller and requires low latency.

I wouldn't be so sure about that, If you have gone to the effort to vectorize your code across 128bits, using AVX2 just gets double the perf for very minimal effort.
AVX2 is pretty common in PC / general code, so it's makes the PS5 as the "odd one out" in terms of what is supported.
Of course I'm just a lowly software engineer, and i'm sure that Sony have made a smart decision when looking at the balance of heat/performance/ease of use.
Odd that AMD would go to the effort to remove it though.

Perhaps the game industry has settled on AVX, and just not moved beyond that instruction set?
They added AVX to the jaguar cores for last gen, so it must have been of use there.

can't wait for more detailed analysis of the shots.

 

[chris1515]

I wouldn't be so sure about that, If you have gone to the effort to vectorize your code across 128bits, using AVX2 just gets double the perf for very minimal effort.
AVX2 is pretty common in PC / general code, so it's makes the PS5 as the "odd one out" in terms of what is supported.
Of course I'm just a lowly software engineer, and i'm sure that Sony have made a smart decision when looking at the balance of heat/performance/ease of use.
Odd that AMD would go to the effort to remove it though.

Perhaps the game industry has settled on AVX, and just not moved beyond that instruction set?
They added AVX to the jaguar cores for last gen, so it must have been of use there.

can't wait for more detailed analysis of the shots.

It seems they cut FADD unit

https://twitter.com/x/status/1361074463224303626

Two peoples seems to confirm it.

 

[temesgen]

Font rendering eh. Performance difference in Remedy's Control explained.

PS5 has the best console experience for Zork, fight me

 

[JPT]

It seems they cut FADD unit



Two peoples seems to confirm it.

So for the

10 Print "Hello World!"
20 Goto 10

Crowd, what does it mean that they cut the FADD unit, for practical purposes?

 

[JPT]

So for the

10 Print "Hello World!"
20 Goto 10

Crowd, what does it mean that they cut the FADD unit, for practical purposes?

I googled FADD, so its a floating point add instruction, which I then assume is a accelerator thingy, since the FPU is "basically" an accelerator for Real numbers math.
Now the question, why does or does it not impact game development? I assume since MS added INT4 and INT8 for ML it does not have a big direct impact on ML algorithms that use INTs.
Is a 3D engine based mostly on INT math?

 

[chris1515]

An intervention from sebbbi about the PS5 die

https://twitter.com/x/status/1361230144875225088

https://twitter.com/x/status/1361232455101988866

 

[Nesh]

I am technically illiterate regarding these things. So what does all this mean in practice?
Is the PS5 bottle necked somewhere because they removed something?
What is this they removed and how does it fair next to competition?

 

[BoardBonobo]

So FADD removed as it would not really be used by games. But it is something that might be used in encoding e.g. compression and decompression. So it was redundant anyway due to the kraken block?

 

[ChuckeRearmed]

So FADD removed as it would not really be used by games. But it is something that might be used in encoding e.g. compression and decompression. So it was redundant anyway due to the kraken block?

Probably. It seems they removed the parts are only needed for general computing and created custom implementation of what was not ready earlier.

 

[BRiT]

This is not a comparison thread, so please keep performance comparisons out of it to remain on topic.

 

[chris1515]

I am technically illiterate regarding these things. So what does all this mean in practice?
Is the PS5 bottle necked somewhere because they removed something?
What is this they removed and how does it fair next to competition?

If they remove it there is a good reason if it was mandatory for games, they would not have remove it. Don't forget a console is tailored for games. PC need to be performant in every situation.