AMD's "Big Navi" reportedly has 2x as many CUs as Radeon's RX 5700 XT

2x as many CUs, with architectural enhancements and higher clocks


AMD's "Big Navi" reportedly has 2x as many CUs as Radeon's RX 5700 XT

Two independent leakers have released information about AMD's RDNA 2 "Big Navi" flagship, stating that it will have 80 total Compute Units (CUs), delivering a two-times increase in CU count over today's RX 5700 XT.

Both @KOMACHI_ENSAKA and @_rogame this information on Twitter, refuting prior rumours that AMD's "Big Navi" silicon would feature 72 total CUs. 

Given AMD's promise of a 50% increase in performance-per-watt with their RDNA 2 architecture and the size of chips like Nvidia's Ampere A100, a graphics chip that's 2x larger than today's RDNA-powered RX 5700 XT seems very feasible. That said, such a chip would be harder to manufacture than today's RX 5000 series products, increasing production costs for Radeon.  

When compared to today's RDNA-powered PC graphics cards, the core clock speeds of AMD's RDNA 2-powered console silicon (Microsoft's Xbox Series X and Sony's PlayStation 5) are much higher than what many analysts expected for a new console. Within the console market, power efficiency, and system cooling are essential, making PC level clock speeds out of the question for most system designs. With this in mind, Radeon's RDNA 2 discrete (PC) graphics solutions should be expected to clock much higher than their RDNA-powered counterparts. This means that a greater than 2x performance gain could be possible with AMD's RDNA 2 flagship. 

Looking at the peak clock speeds of Sony's RDNA 2 powered PlayStation 5 console, we know that AMD's next-generation GPUs will be able to deliver peak clock speeds that meet or exceed 2.23 GHz. Sony's PlayStation 5 can clock its RDNA 2 GPU to a maximum of 2.23GHz, a speed which should be achievable on practically all PS5 SoCs to maintain high silicon yields. With this in mind, similar or greater clock speeds should be expected on PC, thanks to the PC market's ability to utilise more aggressive boost clock speed technologies. 

Compare the PlayStation 5's GPU clock speeds to AMD's RDNA-based RX 5700 XT's maximum (reference) boost clock speed of 1905 MHz. The PlayStation 5's peak clock speeds are 17% higher than what we have seen with AMD's current RDNA flagship, which means that the same, or similar, boost should be possible on AMD's RDNA 2 flagship. 

Assuming that no other limitations come into play, a 100% increase in CU count and a 15+% increase in GPU clock speeds should allow AMD's RDNA 2 flagship to deliver a 130+% boost in performance over today's RX 5700 XT. That's more than enough to surpass Nvidia's RTX 2080 Ti. Beyond that, AMD could deliver further performance gains through architectural enhancements. These estimates are a best-case-scenario for AMD, as scaling a graphics card to this chip size could result in sub-par performance scaling. This was the case with AMD's RX Vega series GPUs, and history could repeat itself with RDNA 2. 

Rumour has it that AMD's  

If these rumours are legitimate, AMD's RDNA 2 flagship is going to be a powerful product. That said, it is unknown how powerful Nvidia's Ampere gaming products will be, and that will ultimately dictate the pricing of AMD's upcoming RDNA 2 products. 

You can join the discussion on AMD's "Big Navi" RDNA 2 flagship containing 80 compute units on the OC3D Forums
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Most Recent Comments

04-08-2020, 19:54:20

What is not to like?

The price it will be.Quote

04-08-2020, 21:46:03

I half expect to see some beefier cooling in the next gen consoles. But shrinking to a smaller node and going multi die on the CPU is going to make them easier to cool, so not on the same level as PC.
I hope to hell that they really have done away with the blower style coolers this time around. Otherwise i cant see them clocking much higher than that and hopefully overall better quality.Quote

05-08-2020, 10:07:06

More rumours, I demand a Die Shot! Quote

05-08-2020, 10:16:10

As Jay said today, if big navi is 50% faster than RTX 2080ti, this would mean next big navi cards would have to be at least 300% faster than 5700XT.

I don't think that is possible, not even x2 on the CU units and increasing core clocks.

Now, the big issue here will be prices and drivers. AMD will probably launch big navi at prices around 700$ (at VEGA VII prices). This is my guess. And the drivers are awful. They are a disaster. A enormous one. With a lot of bugs and crashes.

What about Nvidia? Well, it's said that the 3080 will be 20% faster than the RTX 2080ti according to a youtuber called "Moore's law is dead".

I think, and this is my guess, that Nvidia will win AMD flagship with the 3080. And i will say more: no way AMD is going to win the Nvidia 3080ti/super. And consider this: Nvidia will still have the Titan.

AMD should sell their products cheaper than Nvidia, because i don't think they are going to be able to compete in performance. Once you get to a certain performance you need, you care about price.Quote

05-08-2020, 11:33:17

Not sure how you did your maths, but the average FPS gains I see online for RTX2080Ti vs RX5700 XT are 35%, so the new card would only need to be 203% (1.35 * 1.5 = 2.03) the speed of the 5700XT to be 50% faster than the RTX2080 Ti, IE it would only need to be 100% faster than a 5700XT rather than 300% faster.

(200% the speed of = 100% faster, 300% the speed of = 200% faster, possibly a language barrier thing?)

So if they were able to double the CUs, bump the clock speed and IPC to alleviate the efficiency losses, 50% faster than an RTX2080Ti would be fairly trivial to achieve. *IF* they can double the CUs from 40.

But yep, NVidia could probably go further still, but it's more likely to be in the region of 15-20% faster than AMD's flagship rather than the gap we've seen previously.Quote

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