I took the 8-9GB/s figure to be a simple calculation of the raw SSD speed * the ZLIB/Kraken compression ratio which given he stated Kraken to be about 10% better than zlib gives you a ratio between 150% - 165%. Or exactly 8.25GB/s - 9.1GB/s.
Current Generation Hardware Speculation with a Technical Spin [post GDC 2020] [XBSX, PS5]
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I took the 8-9GB/s figure to be a simple calculation of the raw SSD speed * the ZLIB/Kraken compression ratio which given he stated Kraken to be about 10% better than zlib gives you a ratio between 150% - 165%. Or exactly 8.25GB/s - 9.1GB/s.
Maybe having large L1 and L2 GPU caches? They are determined per shader engine and per memory channel respectively, going by RDNA 1.
With MS having quite a lot more CUs per shader engine, they may have double the L1 compared to the PS5. And with them having a lot more CUs and 5 memory channels (at a high level e.g. 5 x 2 x 32 bit) maybe they have something crazy like 250% of the GPU L2 (RDNA cache slices only seem to go up by doubling).
Their "high" sram quantity might be a stealth brag about huge caches, which might also accelerate RT by keeping more levels of the acceleration structure resident in cache.
Clearly, they want people to know about their TF, sram and VRS. They picked a few points to focus on, and there has to be a reason! Same with Sony and their audio and ludicrous speed SSD.
We don't know how many shader engines MS has and thus how many CUs per shader engine there is.
DavidGraham
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I agree it works best in consoles to save costs, but as you scale things up, the cost savings quickly evaporate. on PCs I don't believe a shared pool would work out, not with the kinds of massively powerful CPUs and GPUs that we have there, a Ryzen 3950X with a 2080Ti would need close to 1TB of shared memory pool bandwidth (which is terribly expensive) to even stand a chance.
Most games don't need more than 8GB of VRAM anyway, and those that do use the VRAM as a large texture cache, with most of it just setting there doing nothing. In fact a PC GPU with 8GB of RAM will always play games at much higher texture quality levels than Xbox One X with it's 12GB of shared RAM. Look at the recent release of Gears 5 where the PC version has access to significantly higher texture resolution packs not available for the Xbox One X, same for other multi-platform games too.
If we factor in next gen features, like Sampler Feedback, and smart texture streaming, VRAM utilization will be much better in the future.
On PC, I believe we already have both, as shown above, of course it comes at the cost of higher RAM capacity for the split pool.
I seem to recall the Scorpio Engine have larger caches than its PC equivalent gpus. Read it in one of these threads. Maybe they increased it in Scarlett compared to standard rdna2 gpus.
We know it's 4 shader engines, like PS5. So we know how many CUs per shader engine.
Github was a pretty baller leak.
Metal_Spirit
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We do? How many can present 13.1 Tflops and still spare power for that
I hated lvl 19 of Manic Miner. That damn level haunts my 1980s childhood to this day.
Secret was timming on the red ball or whatever that thing was.
Metal_Spirit
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I do not know any current SSD capable of 4.8 GB/s. Samsung 970 EVO and Intel Optane 905p cannot reach that value (3.2 GB/s is the best max on 970 Evo).
What other do you know?
We have asynchronous compute for that as well. The GPU is not fully loaded to 100% capacity even during rendering processes. We can make it do more.We do? How many can present 13.1 Tflops and still spare power for that
Secret was timming on the red ball or whatever that thing was.
Oh it was in one of the confirmed leaks? Then I have a follow up question: How exactly is having more CU's per shader engine supposed to be worse? And it's not especially high count either, Navi 10 has 20 CUs per Shader Engine, XSX 13(14) if there's 4 Shader Engines
Less L1, ROPs and GE per CU.
Did the same leak confirm those numbers too?
Assuming it didn't, or didn't all of them:
L1 is according to RDNA whitepaper tied to "group of Dual Compute Units", it doesn't specify it needs to be some specific amount of them or that it needs to connect to specific amounts of ROPs either, so how can we know there's less of it?
Shader Engine can have varying amounts of ROPs
Geometry Engine isn't part of Shader Engines
Scorpio has a 2MB GPU L2 whereas the nearest sized desktop would be Hawaii (44CU), which sported only 1MB L2.
"The new graphics L1 cache serves most requests in each shader array, simplifying the design of the L2 cache and boosting the available bandwidth."
L1 is per shader array.
Who said that? In RDNA wp each SA (shader array) has 4 RBs (4x4 = 16ROPs), 1 rasterizer, 1 primitive unit.
But it doesn't scale with CU either.
And as shader arrays can be of varying size, who's to say how many DCU's each has in XSX or PS5 or any other RDNA2 product, and thus which of them has the most L1 per CU?
To add on top of that, who's to say they even have same amount of L1 per shader array? MS was boasting how much SRAM they have in there and it all needs to go somewhere, possibly some extra in L1 too.
Well, according to the RDNA white paper each SE has two SAs and if XSX & PS5 have 4 SEs they'd have 8 SA's which would mean 128 ROPs, which I just find quite unlikely especially for a console.
Nope. 4 SAs overall for 5700XT.
Exactly, 2 SE's, 4 SAs for 5700 XT. If XSX and PS5 have 4 SE's, they should have 8 SA's and thus 128 ROPs, if each SA has to have 4 RB / 16 ROP
4X16 = 64
What about the RX 480/580? Any idea the amount of L2 they have? I want to know if the amount of L2 in Scorpio was something common to Polaris. I know Scorpio more closely resembles the X1 in its makeup but they did include some features found in Polaris. Curious if the L2 amount more closely conforms to Polaris or Hawaii.
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