EDRAM still possible for PS3?

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hugo

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Is it still possible for Sony to add EDRAM for the RSX?Or is it too late?
The PS2 did have EDRAM right?If they were to find out the bottleneck in bandwidth can they still integrate it in the design?
 
I doubt it, considering RSX is already 300 million transistors! Besides, Nvidia GPUs perform fine without any embedded RAM.
 
How many more transistors would they need to add if say they require something less than the R500's 10mb probably something like 6mb?
 
hugo said:
How many more transistors would they need to add if say they require something less than the R500's 10mb probably something like 6mb?

Why would they?! Just to please the boys wanting to counter the X360 with more useless numbers? "Oh ATI has 10MB EDRAM, we need to have EDRAM too!!!"

Much like the 1Tflop and 2Tflop thing. Or the PPU craze that just won't die.

EDRAM is obviously not needed in the setup Sony and NVIDIA chose, end of the story.
 
would it realy make a difference withthe way sony has there ram setup I would think it would use part of the gddr3 ram for the reasons that x360 has edram
 
hugo said:
How many more transistors would they need to add if say they require something less than the R500's 10mb probably something like 6mb?

6 * 8 * 1024 * 1024 = 50.3 million additional transistors, not including associated logic. That's significant. And I think the die real estate would be larger than that for 50 million pure logic transistors, since we're really talking about 50 million memory cells.
 
I understand that the EDRAM which the R500 has can be accessed at 256GB/s compared with the 256mb XDR pool at 3.2GB/s?It's supposed to throw in instant AA and buffering?
 
But XB360's eDRAM isn't really eDRAM in the sense of the PS/2's eDRAM. It's on an external chip (not embedded on the R500 core) which means its bandwidth is limited from eDRAM's true potential. I've seen conflicting reports, but the true raw bandwidth of XB360's "eDRAM" is more like 32gb/s-64gb/s.
 
DemoCoder said:
But XB360's eDRAM isn't really eDRAM in the sense of the PS/2's eDRAM. It's on an external chip (not embedded on the R500 core) which means its bandwidth is limited from eDRAM's true potential. I've seen conflicting reports, but the true raw bandwidth of XB360's "eDRAM" is more like 32gb/s-64gb/s.

What? Off-chip eDRAM that's only 10MB in size? When Sony managed to fit 32MB of it onto their GS-32?

And how do you get 256GB/s between two chips without a 2,048-bit wide bus, which would not work between two chips anyway...
 
Still if it averages at ~40GB/s that's wayyy faster than XDR's 3.2GB/s.
Even though at a small volume of 10mb the EDRAM should ease up the bandwidth contraints quite a bit for the R500 GPU.The RSX has to share the memory pool with the Cell in this case for the fast XDR.
 
phat said:
What? Off-chip eDRAM that's only 10MB in size? When Sony managed to fit 32MB of it onto their GS-32?

And how do you get 256GB/s between two chips without a 2,048-bit wide bus, which would not work between two chips anyway...

PS2 was not eDRam, it was static Ram (just logic, no capacitors - fastes, but needs most space - eg. All CPU L1 caches are static)

256GB/s is a marketing number - it includes bestcase "effective" Bandwith under FSAA. if 6x is the highest FSAA supported that would be ~42GB/s "real" Bandwith. I suppose its a 256 Bit Bus, 512 at most.
 
Npl said:
PS2 was not eDRam, it was static Ram (just logic, no capacitors - fastes, but needs most space - eg. All CPU L1 caches are static)
GS embedded ram was DRAM, not SRAM.
There would be need more than 200 Mtransistors to employ a 4 Mb SRAM
 
nAo said:
GS embedded ram was DRAM, not SRAM.
There would be need more than 200 Mtransistors to employ a 4 Mb SRAM

I was pretty sure it was static. Damn, never occured to me :oops:
 
All this meaningless threads about PPU and "can they add that or maybe do this". I totally agree with LondonBoy im getting tired of all this but i guess its because of all the new forum-members.
 
There's still a lot of things we don't know about the RSX - i.e. almost everything! Without such info it's difficult to predict memory-access patterns of the system, or how FlexIO really fits into the whole picture, or what is the impact of eDRAM.
 
What 300 million trannies goes towards? How does this compare with there existing GPUs? Is there a tranny:pipeline ratio that we can use to predict the number of pipelines?
 
How many transistors were they predicting for the R520?Over 200million right?I guess the real figure of the R500 should be around that number instead of the 150M.ATi is playing games with Nvidia and Sony.
 
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