GeForce GTX 560 Ti vs Radeon HD 4890 1GB

Intro

Compare those specifications to the Radeon HD 4890 1GB, which features core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 560 Ti		170 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 20 Watts (12%)

Memory Bandwidth

The GeForce GTX 560 Ti, in theory, should be just a bit faster than the Radeon HD 4890 1GB in general. (explain)

GeForce GTX 560 Ti		128256 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 3456 (3%)

Texel Rate

The GeForce GTX 560 Ti will be much (about 32%) better at texture filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 560 Ti		52608 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 12608 (32%)

Pixel Rate

The GeForce GTX 560 Ti should be a lot (more or less 64%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 560 Ti		26304 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 10304 (64%)

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 data (measured in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 in one second. This figure is calculated by multiplying the total amount of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.