qcmadness

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

大過350mm^2, 都話左架啦

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

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

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

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?

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

qcmadness

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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

qcmadness

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原帖由 Puff 於 2013-8-28 17:56 發表

yield. and perhaps you've to look for where the 1.4 billion transistors are spent if you do keep your mind, or are you gonna think northbridge + audio DSP + memory controller can spend more than 2 bi ...

yield?

only recent cpu use 6t sram as power concerns, older ones use 4t sram.

yield on 4t sram will be higher

and 6t sram with 32mb costs 1.5b+ transistors, don't get why you insist on that

and 1.5b is bare SRAM without controlling and redundancy

qcmadness

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原帖由 Puff 於 2013-8-28 18:05 發表

well, i have written all the reasons (and also estimation) behind my stand in the previous post. you just have them ignored. 6T-SRAM could be wrong, but 1T-SRAM is never the choice (to me) judging fr ...

because you think from customer only

qcmadness

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原帖由 Puff 於 2013-8-28 18:05 發表

well, i have written all the reasons (and also estimation) behind my stand in the previous post. you just have them ignored. 6T-SRAM could be wrong, but 1T-SRAM is never the choice (to me) judging fr ...

I don't mention 1t at all

what I get is from Xbox 360 data, which is much more logical then your wild estimation based on jaguar

qcmadness

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原帖由 Puff 於 2013-8-28 18:12 發表

And yours aren't logical at all, as you assume it uses eDRAM but it doesn't seem right. Note that they reiterate eSRAM for many times. Also the die area estimation somehow doesn't fit your super-smal ...

Too high cost for this application