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Andrespetmonkey on 23 January 2013
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ethomaz said:

Andrespetmonkey said:

I don't know what you're talking about, but I'll take your word for it. I just assumed "vram" was referring to the gddr5.

The GDDR5 modules sold in the market are 256MB, 512MB, 1024MB and 2048MB.... each module have a 32bits interface.

So you can't get 2.2GB from these modules... any amount of RAM have to be multiple of these modules.

Eg.

4GB GDDR5 = 8x 512MB (256bits interface)

or

4GB GDDR5 = 4x 1024MB (128bits interface)

The bits interface give you the final bandwidth for the memory...each GDRR5 module at 32bits have a bandwidth of 20GB/s (dependes of the clock)... so 8 modules (256bits) give you 160GB/s of bandwidth... 4 modules (128bits) give you 80GB/s bandwidth.

The supposed bandwidth for PS4 is 160GB/s... so a 256bits interface that needs 8 modulos of GDDR5.

8 x 256MB = 2GB
8 x 512MB = 4GB

So it's impossible to reach 2.2GB with GDDR5.

ok, thanks for the explanation.

So this 2.2 number was just pulled out of someone's arse then?



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