GeForce GTX 560 Ti 448 vs Radeon HD 4870 1GB

Intro

Compare those specifications to the Radeon HD 4870 1GB, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory works at a speed of 900 MHz on this model. 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)

Radeon HD 4870 1GB		150 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 60 Watts (40%)

Memory Bandwidth

In theory, the GeForce GTX 560 Ti 448 will be 25% faster than the Radeon HD 4870 1GB in general, because of its greater bandwidth. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4870 1GB		115200 MB/sec
	Difference: 28800 (25%)

Texel Rate

The GeForce GTX 560 Ti 448 will be quite a bit (more or less 37%) faster with regards to anisotropic filtering than the Radeon HD 4870 1GB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 10992 (37%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 560 Ti 448 is superior to the Radeon HD 4870 1GB, and very much so. (explain)

GeForce GTX 560 Ti 448		29280 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 17280 (144%)

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 max amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.