Radeon HD 4670 512MB vs Radeon HD 5570

Intro

Compare those specifications to the Radeon HD 5570, which uses a 40 nm design. AMD has set the core frequency at 650 MHz. The DDR3 RAM works at a speed of 900 MHz on this specific card. It features 400(80x5) SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 27 Watts (63%)

Memory Bandwidth

In theory, the Radeon HD 4670 512MB should be a small bit faster than the Radeon HD 5570 in general. (explain)

Radeon HD 4670 512MB		32000 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 3200 (11%)

Texel Rate

The Radeon HD 4670 512MB will be much (approximately 85%) more effective at AF than the Radeon HD 5570. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 11000 (85%)

Pixel Rate

The Radeon HD 4670 512MB should be a small bit (more or less 15%) better at full screen anti-aliasing than the Radeon HD 5570, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 800 (15%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.