[Definitive] Sony PS3 Thread

By American Ninja
in PlayStation

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Posted
Posted
To clear up the memory misconceptions:

The Xbox 360 has two kinds of memory:

512MB of GDDR3 memory @ 700mhz - This uses an SGI/Xbox1-like UMA "Unified Memory Architecture" so that both the CPU and GPU can access it directly.  This gives the developer freedom to use that space for textures as well as general program data.

10MB of eDRAM built into the GPU - This serves as the Xbox 360's framebuffer and provides astounding bandwidth and incredibly low-latency access.  This is what will make the 360's uber-Anti Aliasing work.

The PS3 has two kinds of memory, according to the GameSpot article:

256MB of Rambus' XDR memory.  This is apparently for the exclusive use of the CPU.

256MB of GDDR memory @ 700mhz.  This is apparently the framebuffer + texture cache for the GPU.

585930024[/snapback]

GDDR3 @ 700mhz means that it's actually (700mhz * 3) = 2100mhz right?

Veteran

b mitchell

Posted
Posted
How so?  The 360 has more processing power and a vastly superior GPU...

I don't really see where you'd get that idea.

585930127[/snapback]

Design = subjective, however on paper, the PS3 hardware advantage over the Xbox360 ~0. Some cpu advantage, however we don't know real world efficiency for either (and assuming 6 SPE's if one is reserved for OS we have ~192Gflops which compares nicely with ~115Glfops for the Xbox360). If the r500 + EDRAM ends up having a significant advantage over the G70 (and the two seem a generation apart in terms of architecture) than the Xbox360 may v. well have some minimal advantage on the screen.
System Bandwidth Main RAM 25.6GB/s

VRAM 22.4GB/s

RSX 20GB/s (write) + 15GB/s

(read)

SB 2.5GB/s (write) +

2.5GB/s (read)

GPU has 22.5 GB/s to external dram + 35 GB/s to/from CELL.

It seriously lacks bandwith.

I hope G70 is reserving to us some other surprise..

From other forums...

Grand Master

Eli

Posted
Posted

Who cares which one is more powerful by a couple of MB.......let's wait for the games to come out and see which has the better GAMES. That is my decision on my next gen system. Not "512MB or 512MB+" or whatever

Grand Master

OrangeSoul

Posted
Posted

Sony Fact :

256 for the cpu and 256 for the gpu. So gpu is limited to 256mb textures at a time without streaming, xbox360, uses unified memory, so cpu can directly access and modify texture data without any transfering overhead. Also the gpu in xbox360 can fetch direct from cpu cache so it doesn't need to read and write to ram. Overall xbox architecture is much more flexable, games can dynamically adjust how much of the 512mb of ram is used for texture memory.

It's clearly obvious now that nvidia was an after thought and that all sony did was take the off the shelf G70 core and stick in like a videocard in the pc. Hence why the design still depends on GDDR3 not XDR. Also I've heard it's only using 128bit interfaces which is 22.4Gb/s way lower than a 6800ultra so forget any AA with that sort of bandwidth, in actual fact the design is going to be very bandwidth starved.

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