Radeon HD 4670 512MB vs Radeon HD 5750 1GB

Intro

Compare that to the Radeon HD 5750 1GB, which uses a 40 nm design. AMD has set the core speed at 700 MHz. The GDDR5 RAM works at a speed of 1150 MHz on this specific card. It features 720(144x5) SPUs as well as 36 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 5750 1GB		86 Watts
	Difference: 16 Watts (23%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5750 1GB should theoretically be a lot superior to the Radeon HD 4670 512MB overall. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 41600 (130%)

Texel Rate

The Radeon HD 5750 1GB will be a small bit (approximately 5%) faster with regards to AF than the Radeon HD 4670 512MB. (explain)

Radeon HD 5750 1GB		25200 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 1200 (5%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 5750 1GB is a better choice, by far. (explain)

Radeon HD 5750 1GB		11200 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 5200 (87%)

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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.