Radeon HD 4850 1GB vs Radeon HD 5750 512MB

Intro

Compare all of that to the Radeon HD 5750 512MB, which comes with a core clock frequency of 700 MHz and a GDDR5 memory frequency of 1150 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 720(144x5) SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

Performance-wise, the Radeon HD 5750 512MB should in theory be just a bit better than the Radeon HD 4850 1GB overall. (explain)

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

Texel Rate

The Radeon HD 5750 512MB should be just a bit (about 1%) better at AF than the Radeon HD 4850 1GB. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 5750 512MB is a better choice, though not by far. (explain)

Radeon HD 5750 512MB		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 largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.