Question AMD Phoenix/Zen 4 APU Speculation and Discussion

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tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
136
Let's not forget that even through 780M was maxed out power wise, but It used only 4800MHz DDR5. 6400MHz offers 33% higher BW, so It should provide some FPS boost.
You won't have max power in laptops equipped with LPDDR5-6400 though as those machines are going to be a different class of products altogether. I suspect things will even out and essentially be the same in thin and light laptops (less power, more bandwidth vs more power, less bandwidth).
 

TESKATLIPOKA

Platinum Member
May 1, 2020
2,429
2,914
136
You won't have max power in laptops equipped with LPDDR5-6400 though as those machines are going to be a different class of products altogether. I suspect things will even out and essentially be the same in thin and light laptops (less power, more bandwidth vs more power, less bandwidth).
Maybe ComputerBase will do a comparison at different TDPs. Then we will see what clockspeed is achievable at lower TDP or how much performance is lost.
LPDDR5-6400 will be most liikely limited to 16GB once more.
 

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
You shouldn't tell me that. You should tell It to the author of that graph.

It s for general information, one can notice that from 55W to 65W perf increase almost linearly with power, wich is just impossible, and the score is quite different from the one of the 70W samsung, perf is not easy to capture with all those turboings...
 

Exist50

Platinum Member
Aug 18, 2016
2,452
3,101
136
It s for general information, one can notice that from 55W to 65W perf increase almost linearly with power, wich is just impossible
Theoretically, if your uncore power is high enough, but doesn't scale as rapidly, then of each additional watt, a greater percentage goes to the cores.

Regardless, they explicitly said they measured those numbers:
Of course, we were also interested in how the new Ryzen 9 7940HS performs with different power limits and have compared it to the Intel Core i7-13700H and the Asus TUF A15's AMD Ryzen 7 7735HS at 35, 45, 55, 65 and 80 watts. On both Asus systems, we were able to set power limits via the Armoury Crate software's manual mode - on the Intel system we used the Freeware tool ThrottleStop. We measured the following results:
 

ryanjagtap

Member
Sep 25, 2021
110
132
96
ETA Prime testing Ryzen 9 7940HS at 15-30W TDP for gaming and emulation. So we can speculate on Ryzen 7040U series as well. He didn't use any upscaling for the gaming as well. He used DDR5-5600 RAM. All games were tested at 1080p, with the exception of MS Flight Simulator which he tested at 720p.

Games testing:

Emulation testing:

edit: He also mentioned some power allocation optimizations present on the chip to dynamically shift power from cores to igpu as needed.
 

eek2121

Diamond Member
Aug 2, 2005
3,051
4,276
136
Saturated market = low prices... im not going to complain about that.

If this means we are going to be able to get cheap ARM, Intel and AMD handhelds that are petty much full pcs you can use in any way you want, i certanly like it.

(and this is when you realise how badly Intel screwed up by not having dual channel on ADL-N), this is the same mistake AMD did with Bobcat and and old small cores.

Intel and AMD both tend to ignore niche market segments. Good to see AMD is beginning to change, but a lot more could be done here.

One of the differences between the Z1 and a normal chip is that the GPU gets priority for power consumption. That apparently is a microcode change (there are other tweaks as well). AMD should have the driver handle that automatically for their regular chips. Who knows why they don’t?

Intel had a great opportunity with ADL-N, they could have had an 8 core chip in everything from SBCs to handheld gaming consoles. Skylake level IPC with AVX2 is “good enough”. I suspect they were worried about hurting i3-i5 sales.

At least AMD is beginning to address the market.

I would love to see an AMD small form factor diy board + chip, however. I know we won’t see something the size of a raspberry pi, but still…
 

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
Theoretically, if your uncore power is high enough, but doesn't scale as rapidly, then of each additional watt, a greater percentage goes to the cores.

Regardless, they explicitly said they measured those numbers:

This occur at way way lower power than 55W, if the uncore power is say 5W this will be the case below 15W or so.

They tested another 13700H based laptop and it score 15500 at an estimated power of 70-80W in a Dell XPS.


One should draw a line from the 80W point to the 55W one to have the real slope, and still, it doesnt score 17000 at 80W, even when they limit the power the turboing is still functional.
 

ryanjagtap

Member
Sep 25, 2021
110
132
96

leoneazzurro

Golden Member
Jul 26, 2016
1,010
1,608
136
Because it's only an announcement and another paper work from AMDs mobile lineup. AMD is so slow getting Phoenix out, looks like Phoenix laptops have to wait another few months.
For the U line sure, it's only an announcement but the HS laptops are already out, even only as ASUS models for now (TUF Gaming and ROG Zephirus 14 already available in Europe).
 

TESKATLIPOKA

Platinum Member
May 1, 2020
2,429
2,914
136
I don't expect high availability of the U version. I wouldn't be surprised If It ended up worse than Rembrandt, because most of the supply will go to handhelds.
 

TESKATLIPOKA

Platinum Member
May 1, 2020
2,429
2,914
136
Handheld Control Panel
This software for handhelds looks pretty nice.


Product support:
  • Anbernic Win600
  • Aya Neo: Original, Pro, Air, Air Plus, Next, Aya Neo 2, Aya Neo Geek.
  • Ayn Loki
  • GPD: Win 2, Win 3, Win 4, Win Max, Win Max refresh, Win Max 2, Pocket 3
  • One X Player: Original AMD and intel, Mini AMD and Intel, Mini Pro, and the One X Player 2
  • Steam Deck: compatible but not fully supported
 

uzzi38

Platinum Member
Oct 16, 2019
2,703
6,405
146
Handheld Control Panel
This software for handhelds looks pretty nice.


Product support:
  • Anbernic Win600
  • Aya Neo: Original, Pro, Air, Air Plus, Next, Aya Neo 2, Aya Neo Geek.
  • Ayn Loki
  • GPD: Win 2, Win 3, Win 4, Win Max, Win Max refresh, Win Max 2, Pocket 3
  • One X Player: Original AMD and intel, Mini AMD and Intel, Mini Pro, and the One X Player 2
  • Steam Deck: compatible but not fully supported
If I end up picking up an ROG Ally (and the chances are very much not 0) then I'm definitely going to be using this.

I am DEFINITELY not going to be using Armoury Crate as my overlay/launcher of choice - that's for sure.
 

NTMBK

Lifer
Nov 14, 2011
10,269
5,134
136
(and this is when you realise how badly Intel screwed up by not having dual channel on ADL-N), this is the same mistake AMD did with Bobcat and and old small cores.
Bobcat was a low end product for cheap and cheerful laptops, single channel was the right move. Dual channel would have increased the die size and pushed up platform costs, and most OEMs would only populate one channel anyway.
 
Reactions: Tlh97 and SteinFG

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
Test of PHX 780M iGPU at NBC :

 

TESKATLIPOKA

Platinum Member
May 1, 2020
2,429
2,914
136
@Abwx was faster.
The best result was in CP2077, where It managed 26% higher FPS at Full HD high details over Yoga with 680M and similar power consumption. In some games, It's actually slower.
Pretty disappointing, faster RAM will help, but not that much.
 

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
@Abwx was faster.
The best result was in CP2077, where It managed 26% higher FPS at Full HD high details over Yoga with 680M and similar power consumption. In some games, It's actually slower.
Pretty disappointing, faster RAM will help, but not so much.

They use DDR 4800 for the 780M while the 680M comparisons use LPDDR 6400, they should had swapped the RAM with DDR 5600 for the tests.
 

mikk

Diamond Member
May 15, 2012
4,173
2,211
136
For the U line sure, it's only an announcement but the HS laptops are already out, even only as ASUS models for now (TUF Gaming and ROG Zephirus 14 already available in Europe).


Extremely limited availability after months and expensive. And it's Asus only as usual, I call it paper work. It's the usual AMD thing, get 1-2 showcase models out 3-4 months after launch (usually Asus exclusive) and people like you are happy. The next devices come out 6+ months after launch , and then rinse and repeat. At CES next January AMD will announce or launch whatever the next paper work and only then we see a reasonable low volume from the last generation, see Rembrand!
 

ZGR

Platinum Member
Oct 26, 2012
2,054
661
136
If the entire SoC consumes 35W vs 680M’s 45W and is 12% faster that isn’t bad. But I can’t find proper power comparisons. Power consumption is definitely one of the most important factors, but so is the price; it looks high.

I can’t imagine this thing ever competing with a dGPU that has its own power budget like an RTX 3050.

I use a tigerlake U laptop with 48 Xe EUs at 28W. I find it’s graphics plenty fast for my needs. But compared to 680M or 780M, performance per watt is awful. But since TIgerlake was priced so competitively, it didn’t matter.

Really happy with how competitive the iGPU market has become. While I won’t be buying one, I expect we will see some decent deals on 680M laptops this Black Friday.
 

TESKATLIPOKA

Platinum Member
May 1, 2020
2,429
2,914
136
Proper comparison against 680M with same RAM:


~15% faster with +27% clock speed increase. Meh improvement, in my opinion.
That RAM speed is only 4800 MHz, that's not enough even for Rembrandt!
The highest gain is in Assassin's Creed Valhalla +23%.
The lowest gain is in Shadow of the Tomb Rider +9%.
Give them 6400MHz LPDDR5 with 33% higher BW, then we can talk how good or bad 780M is.

BTW, I wonder If this is really a proper comparison.
We know memory is slow and likely with bad timings, but 680M has only 2200MHz and 780M has 2800MHz clock speed.
I don't think they have the same TDP limit.
 
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