AMD: Navi Speculation, Rumours and Discussion [2019-2020]

No.

How much is 384b@16Gbps?
768GB/s or so isn't it?

 

Isn't sienna's child Navi 21, which has HBM confirmed?

 

Yes.

No.

 

Can you please elaborate? Because AMDGPU driver code commits for Linux kernel 5.9 are saying an opposite.

 

They also say this.
https://lists.freedesktop.org/archives/amd-gfx/2020-June/050059.html

Guess what the fuck is it actually running.

 

Hopefully all that jazz means performance and features too.

 

They've promised both and they're not the ones to not deliver.
Those are nice products.

 

I wouldn’t call an unused macro in the patch “confirmed” HBM, at most alleged, especially with their habit of cloning code for existing chips to bootstrap new chips.

 

I thought Samsung was selling 18Gbps in 16Gb density/capacity. That would be interesting on a 3090 competitor.

 

No.
DRAM vendors routinely lie.
See 3.2Gbps HBMs getting announced but not existing anywhere in any way, shape or form one year after the said announcement.

 

Wouldn't a 384-bit bus limit AMD to using 12 GB or 24 GB?

 

Techtubers and their sources. And they always have a few of them. To cover all the bases.

 

Hm... that’s a bit short for 80CUs, no?

Unless AMD surprises us with a 512bit bus...

 

Who are you that you speak as though you have explicit insider info?

I fully expect top range Navi to utilise hbm2 in order to maximise bandwidth without needing to utilise too much die are.

16gb seems like the obvious choice for memory capacity for a high end card. 12gb is 1gb more than nvidias previous flagship, launched 2 years prior.

 

Maybe navi 22 256-bit...for big navi 21 i thought they were going hbm but guess if current HBM stacks do not fit their needs, 384-bit 16Gbps and 768GB/s offers enough bandwidth too. Dont know about ROPs, but funny thing is in that regard it could be similar to GA102 and 12/24GB, even a 6900XT 384-bit and 6900XL 320-bit 10/20GB is posible there

 

Honestly, not sure about your sources or insider info, hope you are right and AMD is there in the highend as Lisa promised. 384-bit makes sense if HBM stacks do not fit for the best solution now, but you also said there is some reason for navi 21 only beeing launched with a kind of "built by ATI" design and no AIB custom designs or at least not at launch or close to it, but if its not HBM, what reason could be that? and what about Navi 22 256-bit custom AIBs?

 

Yeah.

A bit.

Current HBM isn't really that fast unless you're going for 4+ stacks.
The fastest one is on A100 and it is like 2.54Gbps.

The reason is secrecy.

AIBs can easily build HBM boards, they've done it with Vega anyway.

Coming at launch as usual like most 2nd wave AMD chips always do.

 

Sorry, I don't get it.

What am I supposed to see in that firmware header code commit?

 

The GDDR6 reference in the mid-lower part of the code