Radeon HD 4850 512MB vs Radeon HD 5750 1GB

Intro

Compare all that to the Radeon HD 5750 1GB, which has a core clock frequency of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 720(144x5) SPUs, 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 512MB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

The Radeon HD 5750 1GB should in theory perform a little bit faster than the Radeon HD 4850 512MB overall. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 5750 1GB should be a little bit (approximately 1%) faster with regards to anisotropic filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 5750 1GB		25200 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 200 (1%)

Pixel Rate

The Radeon HD 5750 1GB is just a bit (more or less 12%) more effective at full screen anti-aliasing than the Radeon HD 4850 512MB, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 5750 1GB		11200 Mpixels/sec
Radeon HD 4850 512MB		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 largest amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.