Puff

http://semiaccurate.com/2013/08/26/xbox-one-details-in-pictures/

363 mm2. 32MB eSRAM 我估佔 35-45%。
bonaire 160 mm2, Jaguar QC+L2 26.2mm2
PS4 我估唔過 300 (213+52).

xbox 最大問題可能係 PPLL 之類既 algorithm (e.g. TressFx) 比 DDR3 限住 BW，或者比 eSRAM 局住唔用得 (unbounded memory)。
當然唔排除有秘招 (e.g. Intel Pixel Shader Ordering). btw 睇落係支持 HSA, 如果 GPU 係 bonaire 級.
GPU front-end 2 prim/clk, 同 tahiti/pitcairn/bonaire 同水準, 估計 PS4 應該都係。


[ 本帖最後由 Puff 於 2013-8-27 03:39 編輯 ]

qcmadness

http://bbs.hk-spot.com/viewthread.php?tid=70471&page=3

大過350mm^2, 都話左架啦

Puff

引用:

原帖由 qcmadness 於 2013-8-27 21:32 發表
http://bbs.hk-spot.com/viewthread.php?tid=70471&page=3

大過350mm^2, 都話左架啦

呢條 thread 係 PS4 喎

qcmadness

引用:

原帖由 Puff 於 2013-8-27 22:05 發表

呢條 thread 係 PS4 喎

PS4都將會類似

dom

HD7790

qcmadness

引用:

原帖由 qcmadness 於 2013-8-27 22:06 發表

PS4都將會類似

32MB eDRAM ~ 30mm^2 only

Intel 22nm + 128MB eDRAM = 84mm^2
So at 28mm + 32MB eDRAM ~ 30mm^2

Puff

引用:

原帖由 qcmadness 於 2013-8-27 22:11 發表


32MB eDRAM ~ 30mm^2 only

Intel 22nm + 128MB eDRAM = 84mm^2
So at 28mm + 32MB eDRAM ~ 30mm^2

SRAM 喎。

Puff

引用:

原帖由 qcmadness 於 2013-8-27 22:06 發表

PS4都將會類似

我無估算過 xb1，唔評論。

qcmadness

引用:

原帖由 Puff 於 2013-8-27 23:08 發表

SRAM 喎。

好
另一個方法計

xbox 360: 10MB @ 80nm > 64mm^2
xbox one: 32MB @ 28nm > 25.6mm^2

Puff

360 uses eDRAM wor. 2MB 6T-SRAM on 28nm should be sized around 12mm^2 (jaguar's L2 data blocks) Lower frequency headroom may further shrink the size for ten to twenty percent, I think.


1T is possible though, but 6T seems the mainstream of speculation.


[ 本帖最後由 Puff 於 2013-8-28 12:16 編輯 ]

qcmadness

引用:

原帖由 Puff 於 2013-8-28 12:12 發表
360 uses eDRAM wor. 2MB 6T-SRAM on 28nm should be sized around 12mm^2 (jaguar's L2 data blocks) Lower frequency headroom may further shrink the size for ten to twenty percent, I think.


1T is possibl ...

Xbox 360 10mb edram is about 64mm^2 @ 80nm

where do you get 6mm^2 per mb @ 28nm from?

Puff

引用:

原帖由 qcmadness 於 2013-8-28 12:21 發表

Xbox 360 10mb edram is about 64mm^2 @ 80nm

where do you get 6mm^2 per mb @ 28nm from?

Just look at Jaguar CU. Note that tags are coupled to the L2I block.


estimation: for 5.0-5.4 billion transistors
~2b for GPU, ~1.7b for 32MB 6T-SRAM (32MB*1024^2*8bit*6/10^9), ~0.6b to ~0.8b for the 8-core CPU
~0.5b to 0.7b for anything left behind (NB/DDR3/Audio DSP/TrustZone?)
it sounds logical. anyhow it is significantly denser than trinity/llano.

[ 本帖最後由 Puff 於 2013-8-28 13:43 編輯 ]

qcmadness

引用:

原帖由 Puff 於 2013-8-28 13:19 發表

Just look at Jaguar CU. Note that tags are coupled to the L2I block.


estimation: for 5.0-5.4 billion transistors
~2b for GPU, ~1.7b for 32MB 6T-SRAM (32MB*1024^2*8bit*6/10^9), ~0.6b to ~0.8b f ...

L2 is different with eDRAM

don't mix them up

Puff

引用:

原帖由 qcmadness 於 2013-8-28 17:35 發表

L2 is different with eDRAM

don't mix them up

6T-SRAM. I am sure that I'm clear about the wordings in my posts, and you keep insisting that it uses eDRAM while I said it is not.


[ 本帖最後由 Puff 於 2013-8-28 17:54 編輯 ]

qcmadness

引用:

原帖由 Puff 於 2013-8-28 17:50 發表

6T-SRAM. I am sure that I'm clear about the wordings in my posts, and you keep insisting that it uses eDRAM while I said it is not.

why use 6t as a few watts are not a concern?

to me, insisting on 6t is a little bit dumb