GeForce GTX 570 vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which has GPU core speed of 1000 MHz, and 2048 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 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 4890 2GB		190 Watts
GeForce GTX 570		219 Watts
	Difference: 29 Watts (15%)

Memory Bandwidth

In theory, the GeForce GTX 570 should be 22% faster than the Radeon HD 4890 2GB in general, due to its greater bandwidth. (explain)

GeForce GTX 570		152000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 27200 (22%)

Texel Rate

The GeForce GTX 570 is a bit (about 10%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 570		43920 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 3920 (10%)

Pixel Rate

The GeForce GTX 570 should be a lot (approximately 83%) more effective at AA than the Radeon HD 4890 2GB, and will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 570		29280 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 13280 (83%)

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 (in units of MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number 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 better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.