Discussion RDNA 5 / UDNA (CDNA Next) speculation

[Saylick]

It is being reported from one of the packaging partners that a *WCCFTECH leechers discouraged*mysterious CPU box is being *WCCFTECH leechers discouraged*manufactured. The source does not yet have the front of the box *WCCFTECH leechers discouraged* but according to them, the back of the CPU has exciting information with important keywords like "supercharge your games *WCCFTECH leechers discouraged*with the best *WCCFTECH leechers discouraged*Turbo Boost yet" and "AVX-512 helps to make even slower*WCCFTECH leechers discouraged* GPUs faster by removing critical *WCCFTECH leechers discouraged*bottlenecks exposed in the execution pipeline *WCCFTECH leechers discouraged*due to legacy code by introducing *WCCFTECH leechers discouraged*a new optimized codepath that offers better power efficiency and performance without stratospheric temperatures. Over 100 games*WCCFTECH leechers discouraged* supported at launch!".

You gotta get personal at the author itself, and no referencing the website itself because that only entices the unknowing to go visit and check out what the heck WCCFTech even is, which is opposite of the goal.

 

[Kepler_L2]

Looks like VGPR capacity has been increased on CDNA5/RDNA5

to 256KB

 

[Jan Olšan]

It is public, yes. Anyway no point discussing, ethics in journalism died a long time ago

Err, what exactly is unethical about publishing things people already said publicly?

 

[Josh128]

Err, what exactly is unethical about publishing things people already said publicly?

100%, but try cutting and pasting content of an "exclusive" leak from VCZ or 'KEK and posting it say, over at r/AMD without linking to the site and VCZ and WCCF cry like some little babies. I used to see it quite often. WhyCry even made it so that you cant highlight and copy the text from his site some years ago.

 

[adroc_thurston]

Looks like VGPR capacity has been increased on CDNA5/RDNA5
View attachment 129669
to 256KB

Ah no CDNA had 256K VRFs since CDNA2.
It just gets split into normal/accumulate regs on matmul.

 

[Kepler_L2]

Ah no CDNA had 256K VRFs since CDNA2.
It just gets split into normal/accumulate regs on matmul.

There's no split anymore

 

[SolidQ]

Looks like VGPR capacity has been increased on CDNA5/RDNA5

hassan will do like this

 

[poke01]

Err, what exactly is unethical about publishing things people already said publicly?

Stalking them isn’t ethical. Is wcctech so devoid of news that they scrape this site and whatever Kepler says that’s seen as a leak and publish it into an article in the next hour.

They make a ton money off of it and they know exactly what they are doing isn’t right, it’s not illegal but scummy and Kepler leaks do get a lot of clicks.

 

[Saylick]

Err, what exactly is unethical about publishing things people already said publicly?

On face value, it's not unethical to be commenting on things that are considered public domain. What I don't want to do is reward a website who is essentially the TMZ of the computer hardware world. Allow me to explain:

Wtftech started out by putting out completely unsubstantiated rumors, either by making wild extrapolations on a leak or simply just pulling it out of their butt, and the computer hardware world ate it up because there was an untapped demand for rumors. Over time, through sheer volume of articles and consistent SEO work, they developed a big enough viewership to be taken seriously by industry partners, namely AIBs and mobo vendors. All of a sudden, they were given a non-zero amount of legitimacy because they were now considered "press" and thus given access to things that required an NDA, essentially being used by the industry as a corporate mouthpiece to whomever wanted access to their viewership. Meanwhile, the authors behind Wtftech remained the same kids who obtained degrees in non-computer hardware fields running a website with one of the most toxic viewerships ever, as evidenced by their comments section that they refuse to moderate (likely because that would kill their viewership). Nowadays, there's enough leaks in the world via bilili, AT forums, Reddit, Twitter, etc that they no longer need to make stuff up to get clicks, but they aren't any smarter than they were originally; every once in a while they try to be a "real journalist" by giving their analysis on a piece of tech news only to do a piss poor job at understanding the source material, which leads to a misrepresentation of the leak. Imo, this is even worse than just taking the leak at face value because it's now propagating misinformed information. For the most part, they try not to do any additional analysis, but then I would argue they are no better than an RSS feed or a human-powered news aggregator at that point. Given that the vast majority of their authors are from low cost of living places, e.g. India and Pakistan, I reckon the owner doesn't need much revenue/profit to keep the business running.

Long story short, there's little value a website like Wtftech provides to the computer hardware community. They are simply a leech.

 

[CakeMonster]

Much agreed, unfortunately I have a good memory for some things, and dishonest behavior or blatant lying are some of them. I don't think I'm petty because I will forgive, but only if someone properly owns up to their past behavior. So that leaves me not checking certain sites, and blocking certain YT channels. I wouldn't even mind consuming commentary and musings from random casual people if its entertaining or brings some new perspective, its when people are dishonest that it gets to me. Honest mistakes in journalism is fine as well, everybody has to learn. Its the character flaw of lying that is problem.

 

[Josh128]

Long story short, there's little value a website like Wtftech provides to the computer hardware community.

 

[poke01]

View attachment 129695

great show btw

 

[adroc_thurston]

There's no split anymore

wait no that's actually a halved VRF for CDNA

 

[adroc_thurston]

I think they chopped accGPRs off and moved all matrix memory ops into LDS.
Wonder if there are new matmul memory ops for CDNA5/etc.

 

[Kepler_L2]

I think they chopped accGPRs off and moved all matrix memory ops into LDS.
Wonder if there are new matmul memory ops for CDNA5/etc.

There are https://github.com/llvm/llvm-project/pull/146636

 

[adroc_thurston]

There are https://github.com/llvm/llvm-project/pull/146636

Not new but fat shmem slab means rough parity with Hopper as far as s/w enablement goes.

 

[branch_suggestion]

Please ignore, this is a clueless basket weaver's delusions at play.

Idea of a next generation compute unit with 4 coherent partitions:

I/K$ + SCH - SGPR and/or VGPR - SALU and/or SIMD32 + VMEM + RA and/or TMUx2/LD/ST
I/K$ + SCH - SGPR and/or VGPR - SALU and/or SIMD32 + VMEM + RA and/or TMUx2/LD/ST
I/K$ + SCH - SGPR and/or VGPR - SALU and/or SIMD32 + VMEM + RA and/or TMUx2/LD/ST
I/K$ + SCH - SGPR and/or VGPR - SALU and/or SIMD32 + VMEM + RA and/or TMUx2/LD/ST

64KB unified/dynamic Instruction/Scalar cache - 16KBx4 SGPR - 256KBx4 VGPR - 256KB unified VMEM, can be dynamically split between vector, texture and LDS as needed.

The idea is effectively a super CU with 4 partitions (each partition is a wave by default) like the current WGP, but each partition can independently do the entire graphics pipeline without having to share resources with other partitions (Work-group), however they can and in many cases should share caches with other partitions. Currently the WGP can do 2 Work-groups at a time in CU mode or 1 in WGP mode. This would allow a partition to behave as a Work-group or be combined with a plurality of 2-4 partitions for a wider Work-group as needed.

Versus the current WGP it has 16KB more shared I/K$, doubled SGPR, 64KB more VGPR per SIMD32 and 64KB more VMEM, but now 128KB of it is not stuck being just a scratchpad.
Ray accelerators are doubled, now 1 per partition/4 per CU vs 1 per CU/2 per WGP. Load/stores are also doubled, TMUs are now more granular, 2 per partition instead of 4 per CU/8 per WGP for the same amount overall.

There are probably various reasons why such a drastic ISA change wouldn't work but it just looks neat to me.

 

[igor_kavinski]

There are probably various reasons why such a drastic ISA change wouldn't work but it just looks neat to me.

You know what would be even better? A diagram, even if made in MS Paint

 

[branch_suggestion]

You know what would be even better? A diagram, even if made in MS Paint

I draw crude diagrams in paint.net occasionally, you don't wanna see them.

 

[igor_kavinski]

I draw crude diagrams in paint.net occasionally, you don't wanna see them.

You can PM me if worrying about public embarrassment.

 

[branch_suggestion]

You can PM me if worrying about public embarrassment.

Nah I got this.

FYI it is past 3am as of writing, idk why I do this.

 

[igor_kavinski]

Not that bad. You could use a stylus

 

[Saylick]

Nah I got this.
View attachment 129713
FYI it is past 3am as of writing, idk why I do this.

I fed it into ChatGPT to clean it up and this is what it gave me lol

 

[Hail The Brain Slug]

I fed it into ChatGPT to clean it up and this is what it gave me lol

View attachment 129735

This is a great visual example of how confidently wrong it can be.

The illustration looks great, very clean and well defined.

Sometimes this is harder to perceive in written text responses.

 

[adroc_thurston]

Nah I got this.
View attachment 129713
FYI it is past 3am as of writing, idk why I do this.

hell yeah time for the paint-off