Geforce GTX 770 vs Radeon HD 4870 X2

Intro

Compare those specifications to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory is set to run at a speed of 900 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

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 theoretically perform 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%) better at anisotropic filtering 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 high levels of AA is important to you, then the Geforce GTX 770 is a better choice, and very much so. (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 max amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, 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 maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.