GeForce GTX 560 Ti 448 vs Radeon HD 4890 2GB

Intro

Compare those specs to the Radeon HD 4890 2GB, which comes with a core clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB		190 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 20 Watts (11%)

Memory Bandwidth

Performance-wise, the GeForce GTX 560 Ti 448 should theoretically be a little bit superior to the Radeon HD 4890 2GB in general. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 19200 (15%)

Texel Rate

The GeForce GTX 560 Ti 448 will be a bit (more or less 2%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 992 (2%)

Pixel Rate

The GeForce GTX 560 Ti 448 will be a lot (about 83%) faster with regards to anti-aliasing than the Radeon HD 4890 2GB, and also capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 560 Ti 448		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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at 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 card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.