Radeon HD 4850 1GB vs Radeon HD 5750 512MB

Intro

Compare all that to the Radeon HD 5750 512MB, which features a core clock frequency of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 720(144x5) SPUs, 36 TAUs, 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

Theoretically, the Radeon HD 5750 512MB should perform a small bit faster 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 will be a little bit (about 1%) faster with regards to anisotropic filtering 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

The Radeon HD 5750 512MB will be a bit (about 12%) better at full screen anti-aliasing than the Radeon HD 4850 1GB, and also should be capable of handling higher screen resolutions more effectively. (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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 are processed per second. This is worked out 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 card will be at handling 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 write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.