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Xbox One Silicon Talk

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#1 BajiRav

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Posted 26 August 2013 - 17:44

http://www.hotchips.org/

 

No live blog, no video feed. Just some updates from twitter

 

 

 

 

 

 

 

 

From http://semiaccurate....ls-in-pictures/

 

XBox_One_SOC.jpg

 

XBox_One_diagram.jpg

 

XBO_GPU_WM.jpg

 

XBO_diagram_WM.jpg

 

XBO_Audio_WM.jpg

 




#2 Showan

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Posted 26 August 2013 - 18:09

Ok... It's official... The Xbox One is a beast, as far as games consoles go.... Like I said in one of my post... It's the things you can't interact with that make the XB1 a beast...

 

PC-Players, I don't want to hear it... We know.... :D



#3 CygnusOrion

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Posted 26 August 2013 - 18:12

But the PS4 has 18 to 12 GPU compute units and GDDR5 vs GDDR3 RAM...



#4 bjorndori

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Posted 26 August 2013 - 18:23

Here are some slides in better details.

http://semiaccurate....ls-in-pictures/



#5 trooper11

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Posted 26 August 2013 - 18:25

Its nice to see some specific facts about the hardware on these consoles.

 

 

47mb of cache is fairly ridiculous.  No current AMD or Intel cpu employs that much on die cache.  I'd be interested in knowing how this storage is spread out among L1 and L3 cache and what the latency/bandwidth numbers are for that cache.

 

Also, the slides reveal that there is 8GB of flash memory on board (eMMC).  I'm not sure that was ever confirmed, but I wonder what that flash is used for.  It could be used in concert with the hard drive for caching, or have something to do with preloading games in order to allow for starting a game while its still downloading, or just general cloud related functions. 

 

But the PS4 has 18 to 12 GPU compute units and GDDR5 vs GDDR3 RAM...

 

Its not just GDDR5 vs DDR3, its GDDR5 vs DDR3 + SDRAM



#6 OP BajiRav

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Posted 26 August 2013 - 18:29

I wonder if the 8GB eMMC was known? that's completely new info IIRC.

 

Its nice to see some specific facts about the hardware on these consoles.

 

 

47mb of cache is fairly ridiculous.  No current AMD or Intel cpu employs that much on die cache.  I'd be interested in knowing how this storage is spread out among L1 and L3 cache and what the latency/bandwidth numbers are for that cache.

 

 

 

 

Its not just GDDR5 vs DDR3, its GDDR5 vs DDR3 + SDRAM

I wonder if 32MB eSRAM is accounted for in that 47mb?



#7 Showan

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Posted 26 August 2013 - 18:30

Its nice to see some specific facts about the hardware on these consoles.

 

 

47mb of cache is fairly ridiculous.  No current AMD or Intel cpu employs that much on die cache.  I'd be interested in knowing how this storage is spread out among L1 and L3 cache and what the latency/bandwidth numbers are for that cache.

 

 

 

 

Its not just GDDR5 vs DDR3, its GDDR5 vs DDR3 + SDRAM

 

 

That's What I would like to know as well.  If optimized correctly, the XB1 will seem like one seamless transition no matter what your doing. 

 

This kind of information helps you get a true picture of Microsoft's (initial) vision in your head...

Maybe they should of have went with this at the initial reveal... really helps...



#8 trooper11

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Posted 26 August 2013 - 18:40

Some other interesting points that I see:

 

1.  There was a rumor about the eSRAM being boosted to 192 gb/s in bandwidth that closed the gap badwidth wise with what GDDR5 could offer

     -If you look at the slide regarding this, it looks like the bandwidth is listed as 204 or 264 GB/s, which points to even more of a boost to overall memory bandwidth

 

2. There is a reference to 'DisplayPort AV In' on the diagram and then that leads to a 'Composite/DisplayPort/HDMI/SPIDF Out.

  -I wonder what this means.  Are they using a DP mechanism internally in order to properly support HDMI output at 4K? 



#9 trooper11

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Posted 26 August 2013 - 18:45

I wonder if the 8GB eMMC was known? that's completely new info IIRC.

 

I wonder if 32MB eSRAM is accounted for in that 47mb?

 

 

Maybe, its a bit confusing. 

 

At first, I would say it doesn't.  Notice they say that the 47mb refers to 'on chip' storage.  I don't believe the eSRAM is 'on chip' though. 

 

 

Its also interesting that they built the equivalent of a single core processor to handle the audio side of things.



#10 trooper11

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Posted 26 August 2013 - 18:50

Oh also, the gpu slide clearly points to the gpu being 1.31 TFLOPs in raw performance.  So now you can compare that to 1.84 TFLOPs on the ps4 and come to a difference of 40%.  So that should settle any discussion on what the difference in terms of raw performance regarding the gpu only.



#11 bjorndori

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Posted 26 August 2013 - 19:05

I believe the eSRAM is embedded on the chip.

 

Notice the slide titled SoC components, it has the eSRAM listed "inside the box" but the 8GB system RAM is put "outside of the box". If we go by the previous assumption that the CPU uses 2+2MB of L2 cache then we have 11 MB left. Who can guess what they are reserved for.



#12 trooper11

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Posted 26 August 2013 - 19:15

I believe the eSRAM is embedded on the chip.

 

Notice the slide titled SoC components, it has the eSRAM listed "inside the box" but the 8GB system RAM is put "outside of the box". If we go by the previous assumption that the CPU uses 2+2MB of L2 cache then we have 11 MB left. Who can guess what they are reserved for.

 

 

That's true, but that's inside the SoC box, its not part of the cpu portion of the SoC.  If they meant inside the entire SoC when they said 'on chip' then I agree that's likely what it is, but if they meant the cpu specifically when they said 'on chip', then it would seem to point to something other than the eSRAM.

 

That diagram clearly puts the eSRAM outside of the cpu.

 

I'm reminded of Intel terms 'on chip' and 'on package'  to describe parts that were built into the cpu portion and those built into the whole chip (SoC) but not directly integrated into the cpu

 

This would not be unusual if it is not part of the cpu considering that is how it was for the 360.



#13 trooper11

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Posted 26 August 2013 - 19:24

I don't usually follow the Semi Accurate site, but I went to their homepage to see if they had other articles on the info yet.  I had no idea their editorials were so clearly against MS in general and the X1 in particular.  They really don't like anything they are doing lol.  Oh well, at least I know I'm not missing much from the rest of their site.

 

I usually only see their articles referenced when they are posting on technical info, which doesn't involve editorials. 



#14 bjorndori

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Posted 26 August 2013 - 19:25

That's true, but that's inside the SoC box, its not part of the cpu portion of the SoC.  If they meant inside the entire SoC when they said 'on chip' then I agree that's likely what it is, but if they meant the cpu specifically when they said 'on chip', then it would seem to point to something other than the eSRAM.

 

That diagram clearly puts the eSRAM outside of the cpu.

 

I'm reminded of Intel terms 'on chip' and 'on package'  to describe parts that were built into the cpu portion and those built into the whole chip (SoC) but not directly integrated into the cpu

 

This would not be unusual if it is not part of the cpu considering that is how it was for the 360.

47MB on the SoC, the eSRAM seems to be on the SoC, the CPU is also on the SoC. When I used the word chip I meant the SoC, not the CPU. What we don't know is if we have 11MB left on the SoC, Is it used for more L2 cache for the CPU or if it's used for some other processors. The audio processor seems to use quite small memory so what else could it be used for than for more L2 cache

 

I am not good at reading these diagrams so I make many assumptions but I think it's pretty safe to say the One will not get 47MB L2 Cache or anything like that.



#15 trooper11

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Posted 26 August 2013 - 19:44

47MB on the SoC, the eSRAM seems to be on the SoC, the CPU is also on the SoC. When I used the word chip I meant the SoC, not the CPU. What we don't know is if we have 11MB left on the SoC, Is it used for more L2 cache for the CPU or if it's used for some other processors. The audio processor seems to use quite small memory so what else could it be used for than for more L2 cache

 

I am not good at reading these diagrams so I make many assumptions but I think it's pretty safe to say the One will not get 47MB L2 Cache or anything like that.

 

 

Oh I doubt its 47mb of L2 cache as well, but there wording was confusing me as to the purpose of that cache.  It could be spread out among L1,L2, and L3 cache and then include the eSRAM as you said. 

 

Maybe will get a further breakdown of the numbers later. 





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