GeForce GTX 560 Ti vs Radeon HD 4850 X2 512MB

Intro

Compare that to the Radeon HD 4850 X2 512MB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 RAM works at a frequency of 993 MHz on this particular model. It features 800(160x5) SPUs along with 40 Texture Address Units 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 4850 X2 512MB		250 Watts
	Difference: 80 Watts (47%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 560 Ti will be 1% quicker than the Radeon HD 4850 X2 512MB in general, due to its higher bandwidth. (explain)

GeForce GTX 560 Ti		128256 MB/sec
Radeon HD 4850 X2 512MB		127104 MB/sec
	Difference: 1152 (1%)

Texel Rate

The GeForce GTX 560 Ti will be just a bit (more or less 5%) better at anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 560 Ti		52608 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 2608 (5%)

Pixel Rate

The GeForce GTX 560 Ti will be much (about 32%) better at anti-aliasing than the Radeon HD 4850 X2 512MB, and also should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 560 Ti		26304 Mpixels/sec
Radeon HD 4850 X2 512MB		20000 Mpixels/sec
	Difference: 6304 (32%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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