Question AMD Phoenix/Zen 4 APU Speculation and Discussion

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Asterox

Golden Member
May 15, 2012
1,026
1,775
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Of the 8500G would be interesting to see much much bandwidth impacts the performance because if it can get that sort of performance with 16GB single channel DDR5-5200/5600 then we are talking.
I didn't pay attention to that.Only one memory stick/Single Channel, this is proper nonsense for iGPU gaming. Accidental or even intentional, it is difficult to judge what the mentioned Youtuber was thinking.


If we compare what we see.

One stick 16GB DDR5 5200mhz.


32GB DDR5 6000mhz.
 
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Abwx

Lifer
Apr 2, 2011
11,041
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jpiniero

Lifer
Oct 1, 2010
14,671
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Back on topic: These are primarily for OEMs and big S.I.s. The typical tech site forum dweller is definitely not the target market.

I imagine their main interest is the 8300G and 8500G though. They'll upsell the 8700G cuz AI AI AI but the sales will come from the lower models.

I do wonder if DDR5 pricing is still a problem for OEMs, esp with the rumors that Intel is going to refresh Raptor Lake yet again on desktop.
 

FlameTail

Platinum Member
Dec 15, 2021
2,356
1,276
106
I didn't pay attention to that.Only one memory stick/Single Channel, this is proper nonsense for iGPU gaming. Accidental or even intentional, it is difficult to judge what the mentioned Youtuber was thinking.


If we compare what we see.

One stick 16GB DDR5 5200mhz.
View attachment 93122

32GB DDR5 6000mhz.
View attachment 93123
That bandwidth ain't checking out with the math:

(6000 Mbps ÷8) × 128 bit = 96 GB/s
 

DrMrLordX

Lifer
Apr 27, 2000
21,694
10,967
136
CAMM2 is also a possibility. It supports both DDR5 and LPDDR5/5X (making it socketable)


RAM is upgradable for the Mobo above too.

Point being is that lots of people never upgrade their RAM, meaning OEMs could just solder it on and be done with it. That would smooth the transition to on-package RAM ala M1/M2/M3, assuming anyone else goes in that direction for mobile/embedded chips. And it would lower BoM for OEMs.
 
Jul 27, 2020
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Point being is that lots of people never upgrade their RAM, meaning OEMs could just solder it on and be done with it. That would smooth the transition to on-package RAM ala M1/M2/M3, assuming anyone else goes in that direction for mobile/embedded chips. And it would lower BoM for OEMs.
Maybe not the original owner but when it gets sold to someone else for a fraction of its original price, the new owner may want to extend its life a bit more with a RAM upgrade. Soldering RAM on mainstream PCs would be a very shortsighted move. Some OEMs like ASUS already solder RAM in some of their cheaper models but then provide a vacant RAM slot too. If OEMs want to save costs, they can do it this way, without being anti-consumer.
 

Shivansps

Diamond Member
Sep 11, 2013
3,858
1,518
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I didn't pay attention to that.Only one memory stick/Single Channel, this is proper nonsense for iGPU gaming. Accidental or even intentional, it is difficult to judge what the mentioned Youtuber was thinking.


If we compare what we see.

One stick 16GB DDR5 5200mhz.
View attachment 93122

32GB DDR5 6000mhz.
View attachment 93123
I dont know what the youtuber was using.
What i meant is that the 4CUs may be small enoght to the point dual channel does not really matters much. If we are talking about 5700G performance here, the 5700G can get that performance with 8 cores (so more cores to feed) and about 60GB/s max. Single channel DDR5-5200 should be around what? 42? RDNA3 should be a lot more memory efficient than Vega.

This is important because 8GB DDR5 sticks are a waste, and 32GB is kind of expensive, but 1 stick of 16GB DDR5-5200/5600 is more expensive than 2x8 DDR4-3600 but not by much, that reduces the price diference with AM4 a lot.

So this is a scenario i want to see. But i guess you can get better results using a cheapo 2x8 DDR5-4800, it just that is kind of a huge waste.
 
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Reactions: Tlh97

eek2121

Platinum Member
Aug 2, 2005
2,931
4,027
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Point being is that lots of people never upgrade their RAM, meaning OEMs could just solder it on and be done with it. That would smooth the transition to on-package RAM ala M1/M2/M3, assuming anyone else goes in that direction for mobile/embedded chips. And it would lower BoM for OEMs.
Dell is the one actually pushing LPCAMM2. OEMs don’t like doing work for money. They want users to pay $400 for a $35 RAM upgrade that can be attached for $0.50 in labor. Soldering means more complexity and more work.
 

Shivansps

Diamond Member
Sep 11, 2013
3,858
1,518
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Dell is the one actually pushing LPCAMM2. OEMs don’t like doing work for money. They want users to pay $400 for a $35 RAM upgrade that can be attached for $0.50 in labor. Soldering means more complexity and more work.
More like you reduce costs by producing 1 board instead of making 1 board and produce 4 variations of it, having to guess what is going to sell more.
 
Jul 27, 2020
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Even triple channel DDR5 would be a huge improvement for APUs. The big boys can enjoy their hexachannel and 12-channel setups. This dual channel crap for mainstream needs to end.
 
Reactions: MadRat

eek2121

Platinum Member
Aug 2, 2005
2,931
4,027
136
Where is my Threadripper APU, AMD????

I want mobile Threadripper! 96 cores with a 80CU GPU at 54W! 🤣

Actually, I am surprised they haven’t tried something like a mobile version of Threadripper to compete with the M2 Ultra.

EDIT: …and before a bunch of people jump in saying that the thermals will be too high, would be bandwidth limited, consume too much power. etc. I’d like to mention that the 7950X at 65W is faster than a 5950X at 105W. Pair 24 cores with LPDDR5 8533 and I bet it would work quite well at 45-65W.
 

Shivansps

Diamond Member
Sep 11, 2013
3,858
1,518
136
Even triple channel DDR5 would be a huge improvement for APUs. The big boys can enjoy their hexachannel and 12-channel setups. This dual channel crap for mainstream needs to end.
It would be an improvement now, before this point it did not. The 5700G would petty much max out using dual rank memory, i even at 3200 the diference with 3600 was minimal. IF it were the full 11CU that raven ridge originally had at 2Ghz instead of just 8, THEN the memory may have been too slow for it.
 

Shivansps

Diamond Member
Sep 11, 2013
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Glo.

Diamond Member
Apr 25, 2015
5,726
4,606
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Anyone else remember when AMD used side-port memory on the MB for the IGP, the 700 Series chipsets (780G etc) where even 128MB would barely move the needle. Triple/Quad Channel DDR5 might help but I can't see 2x CAMM modules on an ITX board unless one goes on the rear.

LPCAMM2 allows you to have quad channel memory chips with two memory banks.

I believe Dell designed this this way, for very good reason of future products, that involve brand that has letters "A", "M", "D" in their name.

 

Doug S

Platinum Member
Feb 8, 2020
2,304
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LPCAMM2 allows you to have quad channel memory chips with two memory banks.

I believe Dell designed this this way, for very good reason of future products, that involve brand that has letters "A", "M", "D" in their name.


LPCAMM2 is a 128 bit interface, so it is the equivalent of dual channel DDR. Maybe call it 2.5 channel given that it can use chips clocked marginally higher than DIMMs (e.g. 7500 this year, 8500 next, 9600 in 2026)

So you will need two LPCAMM2 slots if you're expecting to reach triple channel DDR let alone quad channel.
 

Glo.

Diamond Member
Apr 25, 2015
5,726
4,606
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LPCAMM2 is a 128 bit interface, so it is the equivalent of dual channel DDR. Maybe call it 2.5 channel given that it can use chips clocked marginally higher than DIMMs (e.g. 7500 this year, 8500 next, 9600 in 2026)

So you will need two LPCAMM2 slots if you're expecting to match triple channel DDR let alone quad channel.
You are talking about the same thing as I have written, only in a more detailed way.

If single LPCAMM2 module is 128 bit bus, then how wide memory bus comes from TWO MEMORY BANKS?

A) 167
B) 192
C) 256
D) Over 9000!

 

Doug S

Platinum Member
Feb 8, 2020
2,304
3,609
136
You are talking about the same thing as I have written, only in a more detailed way.

If single LPCAMM2 module is 128 bit bus, then how wide memory bus comes from TWO MEMORY BANKS?

A) 167
B) 192
C) 256
D) Over 9000!


What are you calling a "memory bank"? I have never heard anyone refer to two modules as "two memory banks" before.
 
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