Question AMD Phoenix/Zen 4 APU Speculation and Discussion

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moinmoin

Diamond Member
Jun 1, 2017
4,954
7,672
136
Ill have the 8500G to test either today or tomorrow.
You could test the efficiency of the different cores if you are able to pin the process and lock the frequency.

Please try to test in two configurations: highest bandwidth and lowest latency.
Wasn't that covered thoroughly enough already by C&C?
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
The 8500Gs didnt arrived, i hope they will on monday. I dont have equipment to meassure power consumption.
One thing i want to test is bandwidth scaling... to see if something like DDR5-4800/5200 in dual channel can already provide all the performance of the IGP and compare to to single channel as well. I want to see how well single channel does here as 4CU should be relatively low bandwidth.
 
Last edited:

Asterox

Golden Member
May 15, 2012
1,026
1,775
136
Maybe AMD stopped optimizing for Vega 2 years ago after they launched RMB? I cant belive that suddenly an 5700G cant run anything. Ill have to test myself.
What we see, you see that Vega has problems in one game.So it's ok, but it is expected that old Vega stumble here and there.Vega is old, and we know it was not designed at all to be only a gaming GPU architecture.

If the game engine likes high GPU frequencies, Vega is in trouble vs very high 2800mhz iGPU.
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
What we see, you see that Vega has problems in one game.So it's ok, but it is expected that old Vega stumble here and there.Vega is old, and we know it was not designed at all to be only a gaming GPU architecture.

If the game engine likes high GPU frequencies, Vega is in trouble vs very high 2800mhz iGPU.
I really didnt expected Vega to run so slow vs the 8500G in an old game like GTAV or Rainbow Six Siege(the same old games that run faster on the GTX1050TI). Newer games seems to have problems with old gpus like the Vega or the GTX1050 due to lack of optimisations or some hardware feature support, like in the case of Alan Wake 2.

Remember the 5700G runs at 2000mhz its not like it is slow either.
 

Abwx

Lifer
Apr 2, 2011
10,963
3,482
136
I really didnt expected Vega to run so slow vs the 8500G in an old game like GTAV or Rainbow Six Siege(the same old games that run faster on the GTX1050TI). Newer games seems to have problems with old gpus like the Vega or the GTX1050 due to lack of optimisations or some hardware feature support, like in the case of Alan Wake 2.

Remember the 5700G runs at 2000mhz its not like it is slow either.

RDN3 is not only clocked 35% higher, it has better IPC and the DDR5 provide 50% higher bandwith, at the end of the day it s not surprising that 4 RDNA3 CUs can match 8 Vega CUs.
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
RDN3 is not only clocked 35% higher, it has better IPC and the DDR5 provide 50% higher bandwith, at the end of the day it s not surprising that 4 RDNA3 CUs can match 8 Vega CUs.
Its not matching it, it is better by a significant margin.
pretty impressive how solidly the 760M beats the 1050 ti. 780M must utterly destroy it.
it would have been nice if they had 4000+ speed RAM on the 5700G for the comparison
nah, Vega 8 performance in Cezanne petty much max out already with dual rank DDR4-3200, dual rank DDR4-3600 is better but by just an small margin.
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
Ok some Geekbench 6 results that i know it is very memory dependant while i wait for some games to be copied over the network.

2x16 5800 3400mhz gpu

2x16 5800 3100mhz gpu

2x16 5800

2x16 5600

2x16 5400

2x16 5200

2x8 4800

8GB 4800 SC

8GB 5200 SC
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136



This is whiout using tricks like FSR2 or resolution scaling.
3300-3400mhz was not stable for gaming might be possible with voltage adjustments

This is also whiout using the EXPO-High Bandwidth or low latency i tested them both without any differences, At that point i was testing on a A620 so it might not work on those motherboards.
I also tested a dual rank 32GB-5200 memory and provided no difference vs the 5200mhz single rank, this is not the case on AM4, maybe because of the channels it makes no difference? like 2x32 vs 1x64.
IGP overcloking dosent work on A620, the bios option is there but it does nothing, this is not a suprise, same happens on AM4.
Timmings is CL40-40-40
 

Trovaricon

Member
Feb 28, 2015
28
43
91
8600G exhibits linear scaling in Witcher3 - I am wondering where lies the threshold of diminishing returns with increased memory bandwidth - 8600G is still only 2/3 of the full die's 12 CUs...
I am also in awe from 4CUs RDNA3 steamrolling "old trusted" Vega 8CUs (to be honest it was loong overdue to stop being utilized in APUs - It was used for 4 years in 4 APU generations!)
 

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
8600G exhibits linear scaling in Witcher3 - I am wondering where lies the threshold of diminishing returns with increased memory bandwidth - 8600G is still only 2/3 of the full die's 12 CUs...
I am also in awe from 4CUs RDNA3 steamrolling "old trusted" Vega 8CUs (to be honest it was loong overdue to stop being utilized in APUs - It was used for 4 years in 4 APU generations!)
6 years actually.
 

alexruiz

Platinum Member
Sep 21, 2001
2,836
556
126
@Shivansps
What drivers are you using?

I downloaded Adrenaline 24.1.1 directly from AMD as they are the recommended ones, but I get error 182 when trying to install them (hardware not recognized)
 

DAPUNISHER

Super Moderator CPU Forum Mod and Elite Member
Super Moderator
Aug 22, 2001
28,498
20,622
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@Shivansps
What drivers are you using?

I downloaded Adrenaline 24.1.1 directly from AMD as they are the recommended ones, but I get error 182 when trying to install them (hardware not recognized)
If the OS and firmware are also fully updated I'd suggest using the auto detect and install option. You can always trash it afterwards, if it works.
 
Reactions: alexruiz

Shivansps

Diamond Member
Sep 11, 2013
3,855
1,518
136
@Shivansps
What drivers are you using?

I downloaded Adrenaline 24.1.1 directly from AMD as they are the recommended ones, but I get error 182 when trying to install them (hardware not recognized)
24.1.1

But keep in mind that Vega and Polaris now are on the legacy branch, so currently there are two 24.1.1 drivers, one for RDNA gpus and other for Polaris-Vega.
 
Reactions: igor_kavinski

TESKATLIPOKA

Platinum Member
May 1, 2020
2,362
2,854
106
After the release of desktop Phoenix I tried once more to download and Install Ryzen master.
My laptop Phoenix is still not supported, and the likelihood It ever will be is minimal.
If you want to play with any settings, then the only option is Universal X86 Tuning Utility.
Quite sad, at least If Ryzen Master supported manual TDP setting for my CPU It would be good enough for me.
 
Reactions: DAPUNISHER
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