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

The XSX also uses an APU, the CPU needs bandwidth too..

 

return to xenos with the rops on a daughter die of cache ?

 

Do ROPs have internal caches? 128 ROPs with a 256 bit GDDR6 memory bus seems low, but if ROPs already have internal caches they probably don't need as much external bandwidth. Not to mention advances in colour compression etc.

 

From the GCN whitepaper, 16KB color and 4KB depth per RBE. I didn't see a reference in the RDNA whitepaper for the capacity, but there's a diagram that mentions an RB cache as a client of the L1.
The ROP caches hold tiles of pixels being worked on or soon to be worked on, like a sort of conveyor belt that can burn a significant amount of bandwidth to cover for memory latency.

 

From a quick google - memory bandwidth of a random Zen 2 processor is only around 60GB/s. Noticeable, but dwarfed by the bandwidth requirements of the GPU (where I think Navi 21 should require ~1.8x the bandwidth of the XSX?).

 

So most likely the 72 CU version was shown at the AMD presentation

 

So XSX pulls less than 200W from the wall during gameplay. Looks like RDNA2 is even more power efficient than some of the early estimates.

https://arstechnica.com/gaming/2020/10/xbox-series-x-unleashed-our-unrestricted-preview/

 

That might be a bit of a misnomer as it might be limited by the software that was available to run. I still hold out reservations until we're a year into next-gen console software titles or we have specific PC titles using AMD RT-RT.

 

Here they compare same game (Red Dead Redemption 2) running on old One X and new Series X:
180 Watt on former and 128 Watt on latter
Real new games should tax harder CPU/GPU, but quite impressive for RDNA2 / Zen2 on 7 nm already.

 

Yes utilization and power consumption will go up during console lifespan. Still impressive stuff.

 

The sub 200W figure was for an un-named "next gen" game. So not a light load by any means, though obviously not something that will squeeze hardware to its limits like late gen games.

 

English translation.

Does S3 sleep really draw 28W on XSX, or does it go into lower power sleep mode after a while? Maybe I’m out of the loop and that’s how just much 16GB GDDR6 draws.

Edit: Maybe the Google-translated “Sleep Mode” means idle rather than standby? AnandTech measured ~50W idle (which matched that Dutch article) but ~15W 10W standby on X1X.

 

My colleagues measured 60 Watts in main menu, which dropped to 38 watts idle soon afterwards. In Doom Eternal XBSX was between 120 and 130 watts, maximum was 162 watts in Dirt 5 (Preview, 4k+HDR). Blu-ray was at 42 watts with the drive (and cooling) humming at 0,7 sone.
https://www.heise.de/tests/Next-Gen...K-Powerhouse-mit-Pfiff-4927844.html?seite=all

 

Well then fine, if the xsx is really that power efficient I'd believe it possible the benchmarks we have are from the cut down die.

72ish CUs and 2ish ghz does match up pretty well with what is expected. Could be with Nvidia pushing the 3080 so hard AMD decided to take the same tack. Especially if they want the full die to sell for $1-1.5k, having a $600-700 gpu as a headliner feels more consumer friendly.

 

Is any console data actually relevant? If it's not under target FPS, it's probably clock-gating itself to hell (and I guess old-gen games are not that demanding, considering they have to run on a gimped 7850) so the power consumption data would be rather meaningless (unless you can repeat the same sequence with the same optimisation/settings on a PC)

 

Where is Navi 20?

 

https://ec.europa.eu/info/energy-cl...roducts/mode-standby-and-networked-standby_en

 

Absolutely relevant. As stated Dirt 5 has already been tried, a 60fps 4k crossgen title not even out yet, it's a title that can already cause dynamic resolutions scaling below 4k on the highest settings on Series X. While Series X goes relatively wide and a tad slow, and thus assumedly efficient in the powerdraw to performance department,and since the CPU and other components are no doubt not being maxed out for Dirt 5, it's not some easy comparison. But it's certainly enough to infer a general idea from.

 

Whoops, I mistakenly swapped the X1 and X1X figures. X1X, which released in 2017 and so would fall under the new rules, draws 10W in standby, per AnandTech.

 

Clocks and voltage is very low comparatively to what you’ll see on the PC space however. Something larger than the Series X with a boost clock above 2200 is likely going to double the power of series x. When it’s hitting up there.