Geforce GTX 770 vs Radeon HD 4870 X2

Intro

Compare those specifications to the Radeon HD 4870 X2, which features a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770		230 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 120 Watts (52%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory be a little bit faster than the Geforce GTX 770 overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
Geforce GTX 770		224384 MB/sec
	Difference: 6016 (3%)

Texel Rate

The Geforce GTX 770 will be much (more or less 123%) more effective at AF than the Radeon HD 4870 X2. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 73888 (123%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 770 is the winner, by far. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon HD 4870 X2		24000 Mpixels/sec
	Difference: 9472 (39%)

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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.