GeForce GTX 660 Ti vs Radeon HD 4870 X2

Intro

Compare that to the Radeon HD 4870 X2, which features a core clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 200 Watts (133%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory perform quite a bit faster than the GeForce GTX 660 Ti overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 86400 (60%)

Texel Rate

The GeForce GTX 660 Ti is quite a bit (more or less 71%) faster with regards to AF than the Radeon HD 4870 X2. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 42480 (71%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4870 X2 is a better choice, but only just. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 2040 (9%)

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 largest amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its 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 core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.