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Booh! on 26 April 2010
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There is a real problem about misinformation, take this post as example:

Hynad said:
Core Clock Frequency
Xbox 360 - 500 MHz
PS3 - 500 MHz

Triangle Setup
Xbox 360 - 500 Million Triangles/sec
PS3 - 250 Million Triangles/sec

Vertex Shader Processing (Vertex ALU x Clock / 4)
Xbox 360 - 6.0 Billion Vertices/sec (using all 48 Unified Pipelines)
Xbox 360 - 2.0 Billion Vertices/sec (using 16 of the 48 Unified Pipelines)
Xbox 360 - 1.5 Billion Vertices/sec (using 12 of the 48 Unified Pipelines)
Xbox 360 - 1.0 Billion Vertices/sec (using 8 of the 48 Unified Pipelines)
PS3 - 1.0 Billion Vertices/sec

Filtered Texture Fetch
Xbox 360 - 8.0 Billion Texels/sec
PS3 - 12.0 Billion Texels/sec

Vertex Texture Fetch
Xbox 360 - 8.0 Billion Texels/sec
PS3 - 4.0 Billion Texels/sec

Pixel Shader Processing with 16 Filtered Texels Per Cycle (Pixel ALU x Clock)
Xbox 360 - 24.0 Billion Pixels/sec (using all 48 Unified Pipelines)
Xbox 360 - 20.0 Billion Pixels/sec (using 40 of the 48 Unified Pipelines)
Xbox 360 - 18.0 Billion Pixels/sec (using 36 of the 48 Unified Pipelines)
Xbox 360 - 16.0 Billion Pixels/sec (using 32 of the 48 Unified Pipelines)
PS3 - 16.0 Billion Pixels/sec

Pixel Shader Processing without Textures (Pixel ALU x Clock)
Xbox 360 - 24.0 Billion Pixels/sec (using all 48 Unified Pipelines)
Xbox 360 - 20.0 Billion Pixels/sec (using 40 of the 48 Unified Pipelines)
Xbox 360 - 18.0 Billion Pixels/sec (using 36 of the 48 Unified Pipelines)
Xbox 360 - 16.0 Billion Pixels/sec (using 32 of the 48 Unified Pipelines)
PS3 - 24.0 Billion Pixels/sec

Multisampled Fill Rate
Xbox 360 - 16.0 Billion Samples/sec (8 ROPS x 4 Samples x 500MHz)
PS3 - 8.0 Billion Samples/sec (8 ROPS x 2 Samples x 500MHz)

Pixel Fill Rate with 4x Multisampled Anti-Aliasing
Xbox 360 - 4.0 Billion Pixels/sec (8 ROPS x 4 Samples x 500MHz / 4)
PS3 - 2.0 Billion Pixels/sec (8 ROPS x 2 Samples x 500MHz / 4)

Pixel Fill Rate without Anti-Aliasing
Xbox 360 - 4.0 Billion Pixels/sec (8 ROPS x 500MHz)
PS3 - 4.0 Billion Pixels/sec (8 ROPS x 500MHz)

Frame Buffer Bandwidth
Xbox 360 - 256.0 GB/sec (dedicated for frame buffer rendering)
PS3 - 20.8 GB/sec (shared with other graphics data: textures and vertices)
PS3 - 10.8 GB/sec (with 10.0 GB/sec subtracted for textures and vertices)
PS3 - 8.4 GB/sec (with 12.4 GB/sec subtracted for textures and vertices)

Texture/Vertex Memory Bandwidth
Xbox 360 - 22.4 GB/sec (shared with CPU)
Xbox 360 - 14.4 GB/sec (with 8.0 GB/sec subtracted for CPU)
Xbox 360 - 12.4 GB/sec (with 10.0 GB/sec subtracted for CPU)
PS3 - 20.8 GB/sec (shared with frame buffer)
PS3 - 10.8 GB/sec (with 10.0 GB/sec subtracted for frame buffer)
PS3 - 8.4 GB/sec (with 12.4 GB/sec subtracted for frame buffer)

Shader Model
Xbox 360 - Shader Model 3.0+ / Unified Shader Architecture
PS3 - Shader Model 3.0 / Discrete Shader Architecture

Should I say more, MikeB?

FALSE: the RSX is clocked at 550 MHz (so all the subsequent math is flawed).

ALMOST TRUE: ...but  you can't use all the 48 pipelines at the same time, so the theoretical maximum is much lower.

FALSE AND GETTING OLD: that's just the bandwith of the 10 MB EDRAM, not the frame buffer bandwith (which is the Memory Bandwidth, shown below).

As a rule of thumb: ATI GPU's have more raw power, while NVIDIA GPU's are better engineered.

some reference:

http://en.wikipedia.org/wiki/RSX_%27Reality_Synthesizer%27

http://wiki.ps2dev.org/ps3:rsx

http://www.extremetech.com/article2/0,1697,2053309,00.asp