Xbox One (Durango) Technical hardware investigation

[Michellstar]

"Msoft XBox One supports shared coherent memory between 8 AMD Jaguar cores and DX 11.1+ GPU like @hsafoundation"


ummmm

 

[dragonelite]

Ekim on gaf posted this.

Msoft XBox One SoC has 47 MBytes cache in 363mm2 die at #hotchips

All i can see is "204GB/sec peak" bottom center

 

[Hardknock]

http://static.ow.ly/photos/original/2YGtW.jpg

Edit: Posted at the same time. Can't read anything tho. lol

 

[MarkoIt]

47 MByte of caches is a lot. It doesn't add up from what we know: 32 Mb eSRAM+ 4 Mbyte CPUs ... 11 MBytes for the GPU alone seems a lot.

 

[McHuj]

47 MBytes cache of cache? 32MB Esram + 4 MB CPU L2's + ??? . I doubt all the L1's amount to more than 1MB.

 

[dragonelite]

I can also see something that looks like
4x 256 bit read & write

 

[MarkoIt]

47 MBytes cache of cache? 32MB Esram + 4 MB CPU L2's + ??? . I doubt all the L1's amount to more than 1MB.

I guess we are dealing with a modified version of Jaguar

 

[McHuj]

I can also see something that looks like
4x 256 bit read & write

To me it looks like the 4 blocks underneath say 8 MB. I'm guessing the ESRAM is split into 4 banks like that.

 

[McHuj]

I guess we are dealing with a modified version of Jaguar

Audio block could have it's own dedicated memory as well, but still, not megabytes worth.

They maybe counting some redundancy memory.

 

[Michellstar]

How much sram a modern GPU/CPU has?
Counting not just L2, L1 + registers?

How much redundancy has AMD built?

Audio block could have it's own dedicated memory as well, but still, not megabytes worth.

They maybe counting some redundancy memory.

You beat me to this

 

[dragonelite]

To me it looks like the 4 blocks underneath say 8 MB. I'm guessing the ESRAM is split into 4 banks like that.

It seems to say 8mb in each block.
So the digital foundry rumor had some truth after it after all.
But from what i remembered df was talking about a max of 192Gb/s.

Found an tweet on gaf.

XBox One CPU has eight "modified" AMD Jaguar x86-64 cores, in two clusters of four cores. Modifiations to memory sharing & bandwidth. #HC25

https://twitter.com/Daniel_Bowers/status/372040673618182144

 

[Rockster]

That 204GB/s figure is down on the ESRAM connection. I thought that was a total system measurement?

 

[Scott_Arm]

I guess we'll have to wait for the slides. Seems everyone at Hot Chips had first-generation phone cameras.

 

[BRiT]

I guess we'll have to wait for the slides. Seems everyone at Hot Chips had first-generation phone cameras.

Shame no one had a Nokia 920 or 1020 phone.

 

[KSterson]

I guess we are dealing with a modified version of Jaguar

No you are dealing with a modern gpu that also have sram... For example a PS4 gpu has + 7 Mo of sram. jaguar has 4.7 Mo. Some other soc components have sram in the X one

 

[dobwal]

I guess we'll have to wait for the slides. Seems everyone at Hot Chips had first-generation phone cameras.

Naw. MS scotchtaped a bunch of anti-photo license plate covers onto the projection wall at the start of the conference.

 

[Scott_Arm]

Naw. MS scotchtaped a bunch of anti-photo license plate covers onto the projection wall at the start of the conference.

Those exist?!

 

[expletive]

Naw. MS scotchtaped a bunch of anti-photo license plate covers onto the projection wall at the start of the conference.

They put one on top of the presenter as well before he started speaking because he's blurry too?!?

 

[KSterson]

But from what i remembered df was talking about a max of 192Gb/s.

that was before the "overclock". At 853 Mhz, theorically, in both way, simultaneously,.. there's 204 GB/s

 

[AlphaWolf]

But from what i remembered df was talking about a max of 192Gb/s.

The change from 800 to 853mhz covers that.

:beaten: