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

So, can they do that fully transparent to software?
Intel also has variable wavefronts (8, 16, or 32 wide) since forever. But afaict, it actually adds quite some complexity to drivers - shaders need to be compiled explicitly for each size and actually even look rather different (although I'm aware the differences are mostly due to the explicit region-based register addressing).

 

beside other specific design, most glaring changes with Navi is that AMD practically doubled most of fixed function units while shaders count increased only marginally, from 36 - 40 CU.

no Ray Tracing mention or Primitive Shader though....

 

I believe it's just sum of L1 cache of all units inside of chip



BTW: does NAVI support RPM ? Does it support HBCC ?

 

225W Board Power for the 5700 XT.

Ray Tracing is to come in RDNA 2, which means next navi generation.

 

The 16kB L1 of Vega 10 are per CU, this one appears to be a per-chip number (though is that really kb and not kB?). Doesn't fit the number of CUs though, maybe that's per SE (so, 4x128kB maybe), with the per-CU cache now dubbed L0?
Guesses, guesses...

 

What about those 256 TMUs? Does it make any sense?

 

Where's the SFUs bundled into?

 

You mean the Rys unit? So ask him!

 

1 x 8-pin and 1 x 6-pin.

 

With AMD being tight lip about power consumption of RDNA vs GCN, this doesn't bode well.

 

$449 and $379. Available 7/7.

 

There's also a 50th anniversary 5700XT that has higher clocks (up to 1980MHz boost, shame they couldn't push to 2GHz just for the bragging rights), and sells directly by AMD for $500.

 

Ryan's piece on Navi cards:
https://www.anandtech.com/show/14528/amd-announces-radeon-rx-5700-xt-rx-5700-series

Turns out it's 251mm^2. The packaging might be adding a couple of mm in each direction.

 

I guess that would be where the rumors of "Full" Navi coming next year comes from.

Not that we'll ever hear or see anything. But would be fascinating to know what went wrong or what trials and tribulations they faced with Navi as full Navi was supposed to launch in 2018.

Regards,
SB

 

Confirmed by Anand: No RT (coming in RDNA 2), and no VRS (also for RDNA 2?).

Primitive Shaders is also active this time.

https://www.anandtech.com/show/14528/amd-announces-radeon-rx-5700-xt-rx-5700-series/2

 

At Computerbase I read that Navi has only one geometry Proceessor and Vega had 4 and NVIDIA 6??????

https://www.computerbase.de/2019-06/navi-radeon-rx-5700-xt/

 

There are 4 rasterizers in distinct blocks there.
That diagram is odd.

 

BTW, if you guys have any questions, I'm glad to answer what I can. I've had a full arch briefing; AMD just didn't give us time to write much.

 

This I'm surprised about, no VRS.