Geforce GTX 780 vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which has a clock frequency of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Geforce GTX 780		10082 points
Radeon HD 6990		5820 points
	Difference: 4262 (73%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Geforce GTX 780		20 Mh/s
	Difference: 4 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 780		250 Watts
Radeon HD 6990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

The Radeon HD 6990 should in theory be a little bit faster than the Geforce GTX 780 overall. (explain)

Radeon HD 6990		320000 MB/sec
Geforce GTX 780		288384 MB/sec
	Difference: 31616 (11%)

Texel Rate

The Geforce GTX 780 is a bit (approximately 4%) more effective at anisotropic filtering than the Radeon HD 6990. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 6336 (4%)

Pixel Rate

The Radeon HD 6990 will be a lot (more or less 28%) more effective at AA than the Geforce GTX 780, and should be capable of handling higher screen resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Geforce GTX 780		41424 Mpixels/sec
	Difference: 11696 (28%)

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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen 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 texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.