GeForce GTX 560 Ti 448 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which has GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 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 1GB		190 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 20 Watts (11%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 560 Ti 448 should be 15% faster than the Radeon HD 4890 1GB overall, due to its higher bandwidth. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 19200 (15%)

Texel Rate

The GeForce GTX 560 Ti 448 should be a bit (approximately 2%) better at texture filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 992 (2%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 560 Ti 448 is superior to the Radeon HD 4890 1GB, by a large margin. (explain)

GeForce GTX 560 Ti 448		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 MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a 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. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.