Monday, May 2nd 2022
New Specs of AMD RDNA3 GPUs Emerge
A new list of specifications of AMD's next-generation "Navi 3x" GPUs based on the RDNA3 graphics architecture emerged, with lower CU counts than previously reported. It turns out that the large "Navi 31" GPU comes with 12,288 stream processors across 48 WGP (workgroup processors), 12 SA (shader arrays), and 6 SE (shader engines). This still amounts to a 140% increase in stream processors over the Navi 21. This chip will power SKUs that succeed the Radeon RX 6800-series and RX 6900-series.
The second largest silicon from the series is the Navi 32, with two-thirds the number-crunching machinery of the Navi 31. That's 8,192 stream processors across 32 WGPs, 8 SAs, and 4 SEs. The Navi 32 silicon powers successors of the RX 6700-series. The third largest chip is the Navi 33, with half the muscle of the Navi 32, and one-third that of the Navi 31. This means 4,096 stream processors spread across 16 WGP, 4 SA, and 2 SE. There's no word on other specs such as memory bus width, but we've heard rumors of AMD doubling down on the Infinity Cache memory technology, by giving these chips even larger on-die caches. RDNA3 is also expected to improve ray tracing performance, as more of the ray tracing pipeline is handled by fixed-function hardware.
Sources:
Redfire75369 (Twitter), VideoCardz
The second largest silicon from the series is the Navi 32, with two-thirds the number-crunching machinery of the Navi 31. That's 8,192 stream processors across 32 WGPs, 8 SAs, and 4 SEs. The Navi 32 silicon powers successors of the RX 6700-series. The third largest chip is the Navi 33, with half the muscle of the Navi 32, and one-third that of the Navi 31. This means 4,096 stream processors spread across 16 WGP, 4 SA, and 2 SE. There's no word on other specs such as memory bus width, but we've heard rumors of AMD doubling down on the Infinity Cache memory technology, by giving these chips even larger on-die caches. RDNA3 is also expected to improve ray tracing performance, as more of the ray tracing pipeline is handled by fixed-function hardware.
74 Comments on New Specs of AMD RDNA3 GPUs Emerge
This is the first 2 thing's that came to mind even though it's all rumours & speculation.
Single harvested die (3600/3600X)
Single fully-enabled die (3700X/3800X)
Dual harvested dies (3900X)
Dual fully-enabled die (3950X)
If AMD was going MCM it wouldn't need three different sizes, would it? Perhaps just a performance-class die to scale up with multiple modules and a tiny one for the entry-level and lower midrange.
It doesn't explain why N31 and N32 aren't multiples of each other, unless 4096 is the size of one chiplet and N31 is 3x chiplets, N32 is 2x chiplets
Nvidia's top end model will consume roughly 900W for a big monolitic chip.
A MCM approach can cut into half of that consumption if done right.
If you assume that AMD will use the full power savings of the new process node for 40% reduced power at the same clocks as N7FF, then that's a drop from 600W for three chiplets to more like 360W but then you still need to add maybe 50-80W for VRM/VRAM/fans. That's a 400-450W card range right there, just based on some extremely flaky and optimistic guesswork.
The chances are good that AMD want to clock the thing as high as is feasible so expect either the new 16-pin power connector or at least 525W (450 from 3x8-pin and 75W slot power).
turns out it did both - was faster than a 2080 ti and used less power than the 3080
I'm not sure it has the same restrictions around an I/O die as the CPUs do, since the connecting fabric is shared cache in a GPU rather than a shared interconnect with the PHY as in a CPU. But this isn't definite at all, I'm only going on nothing other than some months-old AMD slides that were light on technical details.
Facts show us that the navi can't do ray tracing even worse than rtx 2000 , my best bet the next navi ray tracing level is between rtx 2000 & 3000 still too weak i wish amd just remove this ray tracing and reduce the price by 30% and 10 years later make a big come back with real ray tracing .
Honestly, for a lot of people, cooling a 300W card is bad enough. Not all of us live in cool climates and not every form-factor can handle a 300mm-long 4-slot GPU that requires an additional two slots to breathe!
expectedpredicted.