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Question AMD Rembrandt/Zen 3+ APU Speculation and Discussion

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Geranium

Member
Apr 22, 2020
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DDR5 is 64-bit per channel with 2x32 for brust mode. It is like HBM, a single channel is 1024-bit, but it is divided into 8 128-bit sub channel. Or like the GDDR6/6X, 32-bit single channel divided into 2x16-bit channel.

LPDDR5/5X is 16-bit per channel. If a APU supports both DDR5/LPDD5, then total memory channel width will be 128-bit. So it is Dual-channel for normal DDR and Octa-channel for LPDD/X.

On Renoir/Cezanne total memory width is 128-bit. When normal DDR4 is used it act as Dual channel, and when LPDD4/4X is used it act as Octa-channel. Same on Intel's cpu with both DD4/LPDDD4/4X.
 

izaic3

Junior Member
Nov 19, 2019
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With the announcement of stacked cache, do you think that Rembrandt could use that technology, or will Rembrandt be delivered before those kinds of chips come out?
 

IntelUser2000

Elite Member
Oct 14, 2003
7,497
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With the announcement of stacked cache, do you think that Rembrandt could use that technology, or will Rembrandt be delivered before those kinds of chips come out?
Remembrandt uses RDNA2. RDNA2 is about Infinity Cache right?

Since they announced the cache for desktop CPUs I would be a bit surprised if Remembrandt doesn't have it since they can use the Infinity Cache marketing for it. And boost performance as well.
 

andermans

Member
Sep 11, 2020
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Remembrandt uses RDNA2. RDNA2 is about Infinity Cache right?

Since they announced the cache for desktop CPUs I would be a bit surprised if Remembrandt doesn't have it since they can use the Infinity Cache marketing for it. And boost performance as well.
I think indications are that neither VanGogh nor Rembrandt have infinity cache (mostly gleaned from Linux patches for Yellow Carp which presumably is Rembrandt)
 

Gideon

Golden Member
Nov 27, 2007
1,353
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I think indications are that neither VanGogh nor Rembrandt have infinity cache (mostly gleaned from Linux patches for Yellow Carp which presumably is Rembrandt)
The beauty of thks is even If it does have it, budget versions can be made without it as well
 

izaic3

Junior Member
Nov 19, 2019
16
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41





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esquared
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Tuna-Fish

Golden Member
Mar 4, 2011
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Oh dear. @moinmoin was right, they are using fish names.

Can't wait to see Red Herring on a roadmap.
The color + fish codenames are from the Linux drivers. To get the drivers out on release they have to publish code well in advance, and they need some way to refer to gpus while preferably leaking the least information possible. For this reason, the drivers use their own codenames which are used nowhere else. Then enthusiasts try to connect those code names back to the other things. The news would appear that Yellow Carp is the GPU in Rembrandt.
 

DrMrLordX

Lifer
Apr 27, 2000
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The color + fish codenames are from the Linux drivers. To get the drivers out on release they have to publish code well in advance, and they need some way to refer to gpus while preferably leaking the least information possible. For this reason, the drivers use their own codenames which are used nowhere else. Then enthusiasts try to connect those code names back to the other things. The news would appear that Yellow Carp is the GPU in Rembrandt.
In which APU are you the iGPU?

. . .

sorry, had to say it.

Seriously though I hope they don't get all the fish names muddled. I remember when people were calling Kaveri Refresh Godavari (and the name stuck!) when, according to The_Stilt, that was an internal name for something else and not Kaveri Refresh. It got mighty confusing.
 
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