Discussion RDNA4 + CDNA3 Architectures Thread

DisEnchantment · Mar 23, 2022

With the GFX940 patches in full swing since first week of March, it is looking like MI300 is not far in the distant future!
Usually AMD takes around 3Qs to get the support in LLVM and amdgpu. Lately, since RDNA2 the window they push to add support for new devices is much reduced to prevent leaks.
But looking at the flurry of code in LLVM, it is a lot of commits. Maybe because US Govt is starting to prepare the SW environment for El Capitan (Maybe to avoid slow bring up situation like Frontier for example)

See here for the GFX940 specific commits

History for llvm/lib/Target/AMDGPU - llvm/llvm-project

The LLVM Project is a collection of modular and reusable compiler and toolchain technologies. - History for llvm/lib/Target/AMDGPU - llvm/llvm-project

github.com

Or Phoronix

More AMD "GFX940" Enablement Work Landing In LLVM - Phoronix

www.phoronix.com

There is a lot more if you know whom to follow in LLVM review chains (before getting merged to github), but I am not going to link AMD employees.

I am starting to think MI300 will launch around the same time like Hopper probably only a couple of months later!
Although I believe Hopper had problems not having a host CPU capable of doing PCIe 5 in the very near future therefore it might have gotten pushed back a bit until SPR and Genoa arrives later in 2022.
If PVC slips again I believe MI300 could launch before it

This is nuts, MI100/200/300 cadence is impressive.

Previous thread on CDNA2 and RDNA3 here

Question - Speculation: RDNA3 + CDNA2 Architectures Thread

Man I have been dying to make this one for a while now. First rumours for RDNA3 are here so new thread time! Just going to start off with this one for now: kopite7kimi on Twitter: "@VideoCardz Ah, I mean a simple mcm design with 10240 cores is not enough. Because the lift from RDNA2 to RDNA3...

forums.anandtech.com

blackangus · Friday at 7:48 AM

DAPUNISHER said:
Elementary supply and demand economics in action. The consensus here seems to be it is due to allocation going to the more lucrative enterprise markets. Prebuilts are the other reason retail supply is not greater. DIY/retail is last in line.

AMD finally crushed it on a new generation launch. The big improvements in ray tracing and upscaling, along with the new mid range matching last gen flagship in raster while winning in ray tracing, is right out of Nvidia's playbook. Many of us said they should be embarrassed Intel debuted with better RT and upscaling. Good to see Radeon making some real progress for a change.

But But......
Too much power
Not cheap enough
PT sucks
No MSRP
No Availability
The colors are bad
It has fans
I have to plug it in......

Gideon · Friday at 7:51 AM

The launch seems extremely popular:

https://videocardz.com/newz/retailers-now-canceling-cheaper-radeon-rx-9070-preorders-msrp-stock-depleted-but-amd-wants-to-fix-it

Yeah, I don't see the prices coming down until Nvidia fixes RTX 5070 and 5070 Ti availability. AMD had 10-20% of the market and they are not gonna double/quadruple their output just to be left with excess stock once Nvidia is widely available.

But they are certain to swing upward on this graph in both Q1 And probably Q2 too

My best-case prediction is even 25-30% of the market

Sunaiac · Friday at 7:54 AM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

That's a recurring "problem". Many cards will gain quite a lot with UV.
On the other hand, my 7900xtx is absolutely not stable with even 0.05v undervolting, so...
I let it chug along at default voltage, 389W/2880MHz, and accept that the default "too high" voltage is actually a "100% of cards sold will be stable" voltage.

blackangus · Friday at 7:55 AM

Gideon said:
The launch seems extremely popular:

https://videocardz.com/newz/retailers-now-canceling-cheaper-radeon-rx-9070-preorders-msrp-stock-depleted-but-amd-wants-to-fix-it

Yeah, I don't see the prices coming down until Nvidia fixes RTX 5070 and 5070 Ti availability. AMD had 10-20% of the market and they are not gonna double/quadruple their output just to be left with excess stock once Nvidia is widely available.

But they are certain to swing upward on this graph in both Q1 And probably Q2 too

My best-case prediction is even 25-30% of the market

What frequency is this published? I would love to see these numbers for Q2.
I mean I dont expect a huge change but it would be interesting to see.

SolidQ · Friday at 7:59 AM

Sunaiac said:
Many cards will gain quite a lot with UV.

But not many people can do it, there is problem

Interesting will AMD with RX 9050 to this?
Because 5050 if there will be stock, gonna sell like hotcakes
RTX 5050 series- Ti and Non-Ti- 8G VRAM- 135W- 2H of April- $199~$249 expected

Josh128 · Friday at 8:47 AM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

Because a rising tide raises all boats, and some of the boats' hulls protrude deeper into the water than others, and it is imperative that zero hulls touch the bottom.

coercitiv · Friday at 8:47 AM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

Let's launch a business together: we sell undervolted AMD cards for profit. I'll cover most of the work: buying stock, undervolting with new firmware for "game stable" cards, marketing, sales and delivery. You only have to cover the 3 year warranty and tech support.

I guarantee you'll see undervolting in a completely different light as a business owner. (bankrupt business owner, to be exact)

MrTeal · Friday at 9:18 AM

blackangus said:
But But......
Too much power
Not cheap enough
PT sucks
No MSRP
No Availability
The colors are bad
It has fans
I have to plug it in......

Hey, don't discount how difficult it is to plug it in.

All these cord types and voltages are so confusing.

gaav87 · Friday at 10:00 AM

I was bored in traffic today made this on phone xD

tsamolotoff · Friday at 10:28 AM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

AN old time-honoured tradition, my hawaii card could work at less than 1v at stock clocks (1.25v by default), I guess this allows to save some money on salvage. Also, not all games would probably work with these "uv" (its not actually real uv unless you control voltage via sppt), something like Returnal or some UE5 titles might crash it

fastandfurious6 · Friday at 10:36 AM

SolidQ · Friday at 10:49 AM

tsamolotoff said:
something like Returnal or some UE5 titles might crash it

need more test from real users

I guess this allows to save some money on salvage

or not all samples work like UV

DAPUNISHER · Friday at 10:50 AM

I almost overpaid for the Phantom Gaming 9070 last night. After Florida sales tax it would have been $680 so I bailed.

adroc_thurston · Friday at 10:51 AM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

Unused watts are wasted watts.

coercitiv · Friday at 10:56 AM

Almost bought the XT Pulse today. Got the stock notification email while buying groceries, by the time I was in front of a computer it was sold out. Supply is clearly very thin out here in the EU.

IEC · Friday at 11:09 AM

Got my 9070XT

Hail The Brain Slug · Friday at 11:12 AM

IEC said:
Got my 9070XTView attachment 119194

Curious to know both what you paid and what the reported power draw is when you max the power limit slider out at +10%

IEC · Friday at 11:18 AM

Hail The Brain Slug said:
Curious to know both what you paid and what the reported power draw is when you max the power limit slider out at +10%

Too much ($829), but because of white tax and tariffs I’m expecting it won’t be cheaper anytime soon given it is the highest tier card from XFX. From reviews appears to be coolest running compared to other AIB but downside is noise. If it’s anything like the 7900XT/XTX I had from XFX definitely needed a manual fan curve.

blackangus · Friday at 11:36 AM

IEC said:
Too much ($829), but because of white tax and tariffs I’m expecting it won’t be cheaper anytime soon given it is the highest tier card from XFX. From reviews appears to be coolest running compared to other AIB but downside is noise. If it’s anything like the 7900XT/XTX I had from XFX definitely needed a manual fan curve.

My Sapphire Nitro + was 709$ before tax and shipping.

gaav87 · Friday at 12:16 PM

Cry in 799$ taichi no tax.

Mopetar · Friday at 12:43 PM

SolidQ said:
I don't understand why AMD so heavily OC card, if UV with much less Power have same FPS

Once upon a time AMD/Nvidia binned their chips by making sure they could hit a given frequency within some power target. This meant lower TDP and that most cards could get a 10+% OC. Sometimes much higher.

Eventually they realized this was leaving stock performance on the table and binned to use a higher TDP and voltage setting to see if the chips could hit a clock target. Statistically as the core count increases, this likelihood goes down, so making the lower bin is figuring out what cores to fuse off.

This means you get bigger bars in launch reviews and everyone effectively gets the benefit of an OC out of the box (relatively speaking of course) but that most of the cards are pushing more voltage than they really need to in order to hit those numbers. So now you can undervolt the card (and in some cases also increase the clock speed if it drops the temperature by a lot) and get the same performance at less power.

It's the same silicon lottery as it always was, but what it means is a bit different now. For non-technical users who would never OC themselves they get more performance, just at the cost of more power.

Josh128 · Friday at 1:35 PM

562 9070 and 9070 XT being scalped on Ebay US. Gross.

SolidQ · Friday at 1:37 PM

Here also undervolt -100W and loss 3% perf

https://www.reddit.com/r/radeon/comments/1j5roap/rx_9070_xt_underclock_outstanding_efficiency

adroc_thurston · Friday at 1:40 PM

SolidQ said:
Here also undervolt -100W and loss 3% perf

you can undervolt anything.
but hey, 144FPS cap efficiency numbers are pretty self-explanatory.

Hail The Brain Slug · Friday at 2:00 PM

IEC said:
Too much ($829), but because of white tax and tariffs I’m expecting it won’t be cheaper anytime soon given it is the highest tier card from XFX. From reviews appears to be coolest running compared to other AIB but downside is noise. If it’s anything like the 7900XT/XTX I had from XFX definitely needed a manual fan curve.

I only managed to get the black mercury magair from amazon for $850. It's not due to arrive for 2 weeks so I'm on the fence about canceling it, that's kind of an absurd level of markup to me.

Discussion RDNA4 + CDNA3 Architectures Thread

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