Geforce GTX 780 vs Radeon HD 3690/3830

Intro

Compare those specifications to the Radeon HD 3690/3830, which features core clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830		75 Watts
Geforce GTX 780		250 Watts
	Difference: 175 Watts (233%)

Memory Bandwidth

Theoretically, the Geforce GTX 780 should perform quite a bit faster than the Radeon HD 3690/3830 in general. (explain)

Geforce GTX 780		288384 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 261888 (988%)

Texel Rate

The Geforce GTX 780 should be a lot (more or less 1450%) better at anisotropic filtering than the Radeon HD 3690/3830. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 155008 (1450%)

Pixel Rate

The Geforce GTX 780 is a lot (more or less 288%) better at FSAA than the Radeon HD 3690/3830, and also will be capable of handling higher screen resolutions better. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon HD 3690/3830		10688 Mpixels/sec
	Difference: 30736 (288%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.