Nvidia Titan X vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which makes use of a 40 nm design. AMD has set the core speed at 830 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific model. It features 1536 SPUs along with 96 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Nvidia Titan X		250 Watts
Radeon HD 6990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

Theoretically speaking, the Nvidia Titan X should be 54% quicker than the Radeon HD 6990 in general, due to its greater bandwidth. (explain)

Nvidia Titan X		491520 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 171520 (54%)

Texel Rate

The Nvidia Titan X should be much (about 99%) more effective at texture filtering than the Radeon HD 6990. (explain)

Nvidia Titan X		317408 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 158048 (99%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Nvidia Titan X is superior to the Radeon HD 6990, and very much so. (explain)

Nvidia Titan X		136032 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 82912 (156%)

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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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