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Geforce GTX 780 vs Radeon HD 6990

Intro

The Geforce GTX 780 has a GPU core speed of 863 MHz, and the 3072 MB of GDDR5 RAM runs at 1502 MHz through a 384-bit bus. It also is comprised of 2304 Stream Processors, 192 TAUs, and 48 Raster Operation Units.

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

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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

Theoretically speaking, the Radeon HD 6990 should perform a 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 small bit (about 4%) faster with regards to AF than the Radeon HD 6990. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is a better choice, by far. (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

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Geforce GTX 780

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Geforce GTX 780 Radeon HD 6990
Manufacturer nVidia AMD
Year May 2013 March 2011
Code Name GK110 Antilles
Memory 3072 MB 2048 MB (x2)
Core Speed 863 MHz 830 MHz (x2)
Memory Speed 6008 MHz 5000 MHz (x2)
Power (Max TDP) 250 watts 375 watts
Bandwidth 288384 MB/sec 320000 MB/sec
Texel Rate 165696 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 2304 1536 (x2)
Texture Mapping Units 192 96 (x2)
Render Output Units 48 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit (x2)
Fab Process 28 nm 40 nm
Transistors 7080 million 2640 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Geforce GTX 780

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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