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AMD RDNA 4 GPUs To Incorporate Brand New Ray Tracing Engine, Vastly Different Than RDNA 3

Great time as far as performance jumps. Was such an exciting time. I remembering seeing people doing 8800 sli rigs and seething with jealousy. I would’ve killed to have a pc like yours at the time. I was stuck on a pentium 4 and 9600 pro (the ATi one) until like 2009. Was broke at the time.
Yeah. It was the time of Crysis benchmarks and 8800 Ultra.
 

Kataploom

Gold Member
I expect a huge turnaround on r/AMD that RT now matters, after saying for the last 3 gens it didn’t 🙃

Better late to the party than never

But I have a feeling Nvidia will turn RT on its head again, it’s already outdated to think you’ll brute force with the original RT pipelines, they’re balls deep into AI and their Neural cache radiance solution for RT could the beginning of a different RT block philosophy. Why even brute force your way with Monte Carlo or ReSTIR? AI knows what real light should look like. Anyway, just a guess, but NCR is probably their next step according to papers.
Uh, actually the problem with RT everyone has, including myself, is that it is too expensive for the results you get in comparison to rasterized lighting, most of great spots are limited to specific sections so why lose performance of the 80% of the game for that? If RT wasn't that expensive or even free, nobody would be saying we don't care about RT, it's just that it's not worth it the performance impact.

AMD having new RT hardware is great, nobody can deny that, whether it makes RT actually worth it for most players is another matter.
 
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winjer

Gold Member
Still the first out the door, that was my point about innovation (even though it's closed ecosystem). Yes now everything is standard and Gsync modules have nearly all disappeared except for their top line.

What I mean in all this is that Nvidia isn't twiddling their thumbs like Intel did. I seriously don't believe in a Ryzen story here for GPU side.

Yes, nvidia was the first, but in this case, AMD did win. One of the few, in recent times.
Freesync is the standard on PCs and consoles. On monitors and TVs. even if some manufacturers rebranded it as Gsync Compatible.

You are correct, nvidia a is not Intel. Jensen Huang is not an incompetent fool like Krzanich.
So it'0s unlikely that AMD will overtake nvidia. Be it in the GPU space, or for AI.
 

shamoomoo

Member
Outside of a couple outliers like Cyberpunk and Alan Wake 2, sponsored games don’t get any special treatment, or function better than non-sponsored games. Hell, AMD sponsored The Last of Us.
The point is there are few games with relatively good implementation of RT independent of Nvidia on PC. Yeah, AMD could sponsor games to make sure RT runs decent on their GPUs.
 

Loxus

Member
With that being said, so far these are the SE count of RDNA4.
Navi44 - 16WGP (2SE, 32CU, 64ROPs)
Navi48 - 32WGP (4SE, 64CU, 128ROPs)

So the WGP per SE is still the same as RDNA3.
8WGP or 16CU per SE.
PS5 having 4SE is more probable than 2SE.
2SE with that many CU seems to be inefficient as well.

For higher end RDNA4 going by Navi44/48, it appears to be still 8WGP or 16CU per SE.
And it seems each SED houses 2 Shader Engines.
RDwiOHU.png


Navi41
1SED = 2SE/16WGP(32CU)
6SED = 12SE/96WGP(192CU)
1AID = 2×64bit or (4×32bit GDDR PHY)
2AID = 4×64bit GDDR PHY = 256bit

Navi40
1SED = 2SE/16WGP(32CU)
9SED = 18SE/144WGP(288CU)
1AID = 2×64bit or (4×32bit GDDR PHY)
3AID = 6×64bit GDDR PHY = 384bit
In one of my previous posts I detailed some RDNA4 info from various sources.

I suggested a SED consist of 2SE/16WGP(32CU).

Some more info on RDNA4 info dropped, which suggests I maybe correct.


So Navi48 maybe 2 SED.
Navi44 = 1 SED = 2SE/16WGP(32CU)
Navi48 = 2 SED = 4SE/32WGP(64CU)

But with rumors and leaks, always take them with a gain of salt.
 
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winjer

Gold Member
In one of my previous posts I detailed some RDNA4 info from various sources.

I suggested a SED consist of 2SE/16WGP(32CU).

Some more info on RDNA4 info dropped, which suggests I maybe correct.


So Navi48 maybe 2 SED.
Navi44 = 1 SED = 2SE/16WGP(32CU)
Navi48 = 2 SED = 4SE/32WGP(64CU)

But with rumors and leaks, always take them with a gain of salt.


This could be the reason why leaks where pointing to such small GPU dies.
AMD might be able to tile a bunch of them to make bigger SKUs.
 

Trogdor1123

Member
Is there an equivalent shift like differences between x86 to Arm in GPUs? I’m assuming they are complete different but don’t actually know
 
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