GeForce GTX 750 Ti vs Radeon HD 4870 X2

Intro

Compare that to the Radeon HD 4870 X2, which uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory runs 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)

GeForce GTX 750 Ti		60 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 290 Watts (483%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 should be 167% quicker than the GeForce GTX 750 Ti overall, because of its higher bandwidth. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GTX 750 Ti		86400 MB/sec
	Difference: 144000 (167%)

Texel Rate

The Radeon HD 4870 X2 is much (approximately 47%) faster with regards to anisotropic filtering than the GeForce GTX 750 Ti. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce GTX 750 Ti		40800 Mtexels/sec
	Difference: 19200 (47%)

Pixel Rate

The Radeon HD 4870 X2 should be much (more or less 47%) more effective at AA than the GeForce GTX 750 Ti, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GTX 750 Ti		16320 Mpixels/sec
	Difference: 7680 (47%)

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 max amount of data (measured in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.