GeForce GTX 570 vs Radeon HD 4890 1GB

Intro

Compare all of that to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
GeForce GTX 570		219 Watts
	Difference: 29 Watts (15%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 570 should be a lot faster than the Radeon HD 4890 1GB in general. (explain)

GeForce GTX 570		152000 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 27200 (22%)

Texel Rate

The GeForce GTX 570 will be a bit (approximately 10%) faster with regards to texture filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 570		43920 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 3920 (10%)

Pixel Rate

The GeForce GTX 570 will be much (approximately 83%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 1GB, and also will be able to handle higher screen resolutions better. (explain)

GeForce GTX 570		29280 Mpixels/sec
Radeon HD 4890 1GB		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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling 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 could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.