Radeon HD 4870 1GB vs Radeon HD 5750 1GB

Intro

Compare those specs to the Radeon HD 5750 1GB, which has a clock frequency of 700 MHz and a GDDR5 memory speed 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 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 64 Watts (74%)

Memory Bandwidth

The Radeon HD 4870 1GB should in theory perform a lot faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 41600 (57%)

Texel Rate

The Radeon HD 4870 1GB is a small bit (approximately 19%) more effective at texture filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 4800 (19%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4870 1GB is the winner, but not by far. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 800 (7%)

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 maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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