Question AMD Phoenix/Zen 4 APU Speculation and Discussion

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tamz_msc

Diamond Member
Jan 5, 2017
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I see 60+ FPS.

You can see it for yourself by using . and , buttons while youtube video is paused. Those allow you to go frame-by-frame in any youtube video. And in this 1080p60fps youtube video, when the character is moving, each youtube frame shows a diferent frame on the device, meaning it's at least matches youtube FPS (60).

It simply can't be 20 or 30 FPS, otherwise we'd see repeated frames in the video.
You can also see that the distant landscape is stuttering when he pans the camera at 8:12. Even if we disagree on the frame rates in RDR2, you must agree that there is no way he can get those numbers in Forza Horizon 5 at 25 W package power, given what he showed in his 7940HS test.
 

mikk

Diamond Member
May 15, 2012
4,172
2,210
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AMD lowered the 780M clock speed from 2800 Mhz to 2700 Mhz on Phoenix?

The top model Radeon 780M, which has 12 cores (768 shaders) and a maximum clock rate of 2.7 GHz, is put to use in the Ryzen 9 and Ryzen 7 CPUs (originally 2.8 GHz, but according to AMD it is now a maximum of 2.7 GHz).

We also recently heard from AMD that the 780M's maximum clock rate will lie at 2,700 MHz and not 2,800 MHz like our test device. As soon as we receive further test devices, we will update this article.

AMD have since announced that the Radeon 780M's maximum clock rate will be 2.7 GHz instead of 2.8 GHz (like in our test device), the increased performance might prove to be a struggle, even when using faster RAM.
 
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eek2121

Diamond Member
Aug 2, 2005
3,051
4,268
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It doesn't. TDP is meaningless. Both H and HS CPUs are configured to run at 60-70 W boost.
Wait, did I miss something? HS is no longer 35W?
Existing inventory? So basically Rembrandt?

Yes. The post-pandemic slowdown caught AMD, NVIDIA and Intel by surprise. Between ethereum changing to PoS and interest rates soaring, sales dropped faster than these companies could adapt.
 

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
AMD lowered the 780M clock speed from 2800 Mhz to 2700 Mhz on Phoenix?

If anything this could result to 10% lower TDP assuming the CPU part was overvolted due to the necessary voltage required by the GPU to hit 2.8GHz, also this could allow the CPU to clock a little higher at same TDP and give a better power/perf balance.

7940HS is specified with 35-54W on AMD.com. I don't know if they can boost higher though.
The Asus device tested by NBC is configured at 80W PL1/PL2, at this inflated power it still quite efficient, thanks to 4nm, in respect of Intel s equivalent offering, beside it s possible that the dGPu require more throughput than what is available at 35/45W.


Edit : They have another device with LPDDR 6400 and said that they cant disclose its caracteristics for now, they updated the iGPU synthetic tests though for early comparison, perfs are 4-9% better in 3D Mark.

 
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Kaluan

Senior member
Jan 4, 2022
503
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AFAIK Phoenix also supports LPDDR5X-7500, some announced handhelds seemingly come with it, no idea on ultraportable laptops yet tho.

Judging by the frametime graph in those tests, which look way more spiky than 680M/RDNA2's.... 780M/iGPU RDNA3 is clearly still on early drivers in all these tests.

Also NBC's review is laughable. Only interesting tidbit is the Port Royal test (hybrid/ray tracing), where it's over 50% faster than last gen.

Seem the wait for fully fleshed out drivers and reviews of Phoenix IGP is still ongoing.


Here's 680M w/ DDR5-4800 vs LPDDR5-6400:

View attachment 80354
View attachment 80355


And we're supposed to believe it matters LESS for 780M, when it's not even using natively supported 5600 in all of these so called reviews, let alone LPDDR5 or 5X. lol
Case and point, ETA Prime has a review of a (7840U) 780M w/ LPDDR5X (synthetics @35W):

 
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Kaluan

Senior member
Jan 4, 2022
503
1,074
106
AMD lowered the 780M clock speed from 2800 Mhz to 2700 Mhz on Phoenix?






No.

7940H/HS are 2,8GHz (there is no "U" SKU for this tier), 7840H/HS/U are 2,7GHz. Not sure about the Z1 Extreme tho.
 

Kaluan

Senior member
Jan 4, 2022
503
1,074
106
Here's another reviewer testing the 7840U on the GPD Win Max 2. It's just RPCS3 PS3 emulation testing. He gets different FPS on RDR2, so something is really not right on ETA Prime's review.

That's Red Dead Redemption 1(one)... on PS3... on PC through RPCS3 emulator...

...where you on some funny stuff when you wrote that?


I like how one low-key troll (usual suspect) placed a seed of doubt and now everyone is talking about how ETA Prime is or isn't some fake ass AMD shill or idiot who doesn't know what he's doing lmao
 

ryanjagtap

Member
Sep 25, 2021
110
132
96
That's Red Dead Redemption 1(one)... on PS3... on PC through RPCS3 emulator...

...where you on some funny stuff when you wrote that?


I like how one low-key troll (usual suspect) placed a seed of doubt and now everyone is talking about how ETA Prime is or isn't some fake ass AMD shill or idiot who doesn't know what he's doing lmao
My bad . @SteinFG already brought that to my notice
 
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DrMrLordX

Lifer
Apr 27, 2000
21,802
11,157
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Yes. The post-pandemic slowdown caught AMD, NVIDIA and Intel by surprise. Between ethereum changing to PoS and interest rates soaring, sales dropped faster than these companies could adapt.

That's interesting. One wonders how much Rembrandt is left clogging up the channel. It was so hard to get Rembrandt products in retail.
 

tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
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I like how one low-key troll (usual suspect) placed a seed of doubt and now everyone is talking about how ETA Prime is or isn't some fake ass AMD shill or idiot who doesn't know what he's doing lmao
ETA Prime has a million subscribers on YT and all he does is repeat catchphrases while putting out zero side by side analyses or talking in depth about the product in question.

If I'm a troll, then you must be an AMD stan. If you believe that Forza Horizon 5 FPS at 70+ W is the same as FPS at 25 W but with faster memory, then frankly speaking you're delusional.
 
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Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
ETA Prime has a million subscribers on YT and all he does is repeat catchphrases while putting out zero side by side analyses or talking in depth about the product in question.

If I'm a troll, then you must be an AMD stan. If you believe that Forza Horizon 5 FPS at 70+ W is the same as FPS at 25 W but with faster memory, then frankly speaking you're delusional.

Quite a troll yes, at 45W or so it manage 58 FPS/1080P using DDR5 5600, so it will manage quite better with LPDDR 7500 RAM, at 25W there wont be much loss using faster RAM compared to DDR 5600 at 45W TDP.

Now if you can stop your continual pollution in AMD related threads that would be an huge added value to the sanity of the technical discussions.

A serie of 780M tests can be found here:

 
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tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
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A serie of 780M tests can be found here:
From the same channel you linked, with 680M:



33% more memory bandwith for 3 FPS more.

Tell me what mythical ingredient RDNA3 has that it's gonna surpass that same deficit.

I'm waiting for your technical breakdown, o enlightened one.
 
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Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
From the same channel you linked, with 680M:

View attachment 80417

33% more memory bandwith for 3 FPS more.

Tell me what mythical ingredient RDNA3 has that it's gonna surpass that same deficit.

I'm waiting for your technical breakdown, o enlightened one.

Dear troll we re talking of the 780M wich is clocked way higher than the 680M and is much more RAM bandwith constrained, beside RDN3 has higher flops/clock thanks to dual issue, at some point this will make a big difference.

Edit : At 2.7Ghz and 5600 RAM the 780M is more constrained than a 2.2GHz 680M using 4800 Ram, to be as bandwith limited the 780M should use DDR 5900, so at 5600 it s a step back in matter of Bandwith/throughput, it s a comparable to a 680M using 4600 Ram.
 
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tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
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Dear troll we re talking of the 780M wich is clocked way higher than the 680M and is much more RAM bandwith constrained, beside RDN3 has higher flops/clock thanks to dual issue, at some point this will make a big difference.
...which doesn't work (in most cases). And you claim yourself an expert.
 
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eek2121

Diamond Member
Aug 2, 2005
3,051
4,268
136
It newer was limited to just 35W.
Asus ROG Zephyrus G14 with 6900HS is 125W sustained in Turbo mode.
That sounds like a configuration issue. My Cezanne laptop does not exceed 45W.

I was thinking about upgrading and giving my wife my old Cezanne laptop since she needs a new one. I can get 2 day shipping on that ASUS from best buy with the 7940HS, but the configuration isn’t great. Only 16gb of RAM, a 4060, and 512gb SSD. Guess I will hold off for better configs/availability.
 

Shivansps

Diamond Member
Sep 11, 2013
3,873
1,527
136
From the same channel you linked, with 680M:

View attachment 80417

33% more memory bandwith for 3 FPS more.

Tell me what mythical ingredient RDNA3 has that it's gonna surpass that same deficit.

I'm waiting for your technical breakdown, o enlightened one.
If this is the case then there is a severe tdp bottleneck, with 12CU it should perform AT LEAST like a RX 6400 if there are no bottlenecks if the gpu clock is around 2300mhz. And the RX6400 trades blows with the GTX1650.

Considering it is a RDNA3 this this should already be matching a rx570 at the very minimum so no idea of what is going wrong here.

Regardless, i trust that youtuber, he has no reason to lie, and unless something is really really wrong there is no way RDR2 is running at 20fps at 1080p low, even a RX560 can get you consistent +40fps at 1080p low. Hell, even a 5700G can get you around 30.
 
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Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
If this is the case then there is a severe tdp bottleneck, with 12CU it should perform AT LEAST like a RX 6400 if there are no bottlenecks if the gpu clock is around 2300mhz. And the RX6400 trades blows with the GTX1650.

Considering it is a RDNA3 this this should already be matching a rx570 at the very minimum so no idea of what is going wrong here.

Regardless, i trust that youtuber, he has no reason to lie, and unless something is really really wrong there is no way RDR2 is running at 20fps at 1080p low, even a RX560 can get you consistent +40fps at 1080p low. Hell, even a 5700G can get you around 30.

A 5800U@25W with Vega 8 does better, so that s not a TDP issue, eventually driver but what is sure is that one has to rely on unreliable tests to believe making a point...

 

tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
136
If this is the case then there is a severe tdp bottleneck, with 12CU it should perform AT LEAST like a RX 6400 if there are no bottlenecks if the gpu clock is around 2300mhz. And the RX6400 trades blows with the GTX1650.
A dGPU has all of its TDP available at full power. An iGPU has only a part of the TDP available to it. In fact CPU cores consume more of the package power than the iGPU does, even with a full 3D load.
 

Abwx

Lifer
Apr 2, 2011
11,167
3,862
136
A dGPU has all of its TDP available at full power. An iGPU has only a part of the TDP available to it. In fact CPU cores consume more of the package power than the iGPU does, even with a full 3D load.

As is usual with you that s the other way around, a 7800X3D require 60W to drive a 300W 4090, a 7800X a little more, it s no different for an AMD APU, CPU power is meaningless compared to the GPU power drain.

With a 680M at 30W the GPU use 80% of the power; at 40W the GPU manage to work at full 2.2 frequency meaning that the CPU part need a much lower power, indeed CPU usage is very low.


That being said we still dont know why the "review" you linked display the 780M as lower performing than a Vega 8 in R2D2; you had to come with foolish explanations like the one in the post i quoted, anyway keep entertaining us with your phantasmogoric analysis, at least you bring some fun...
 
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