Radeon HD 4850 1GB vs Radeon HD 5750 1GB

Intro

Compare all that to the Radeon HD 5750 1GB, which has clock speeds of 700 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 RAM. It features 720(144x5) SPUs along with 36 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5750 1GB is 16% quicker than the Radeon HD 4850 1GB in general, because of its higher data rate. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 5750 1GB will be a bit (approximately 1%) more effective at AF than the Radeon HD 4850 1GB. (explain)

Radeon HD 5750 1GB		25200 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 200 (1%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 5750 1GB is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 5750 1GB		11200 Mpixels/sec
Radeon HD 4850 1GB		10000 Mpixels/sec
	Difference: 1200 (12%)

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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.