GeForce GTX Titan X vs Radeon HD 4870 X2

Intro

Compare all of that to the Radeon HD 4870 X2, which has clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 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 Titan X		250 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 100 Watts (40%)

Memory Bandwidth

Performance-wise, the GeForce GTX Titan X should theoretically be much superior to the Radeon HD 4870 X2 overall. (explain)

GeForce GTX Titan X		336000 MB/sec
Radeon HD 4870 X2		230400 MB/sec
	Difference: 105600 (46%)

Texel Rate

The GeForce GTX Titan X is quite a bit (approximately 220%) more effective at anisotropic filtering than the Radeon HD 4870 X2. (explain)

GeForce GTX Titan X		192000 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 132000 (220%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX Titan X is superior to the Radeon HD 4870 X2, by a large margin. (explain)

GeForce GTX Titan X		96000 Mpixels/sec
Radeon HD 4870 X2		24000 Mpixels/sec
	Difference: 72000 (300%)

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 megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's 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 also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.