GeForce GTX 560 Ti vs Radeon HD 4890 1GB

Intro

Compare that to the Radeon HD 4890 1GB, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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

Theoretically speaking, the GeForce GTX 560 Ti will be 3% faster than the Radeon HD 4890 1GB in general, due to its higher bandwidth. (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 should be a lot (approximately 32%) better at AF 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 will be much (about 64%) better at anti-aliasing than the Radeon HD 4890 1GB, and capable of handling higher resolutions more effectively. (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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.