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Geforce GTX 770 vs Radeon HD 6990

Intro

The Geforce GTX 770 has core clock speeds of 1046 MHz on the GPU, and 1753 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 128 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 6990, which uses a 40 nm design. AMD has set the core speed at 830 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this specific model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

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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 770 7854 points
Radeon HD 6990 5820 points
Difference: 2034 (35%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
Geforce GTX 770 14 Mh/s
Difference: 10 (71%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770 230 Watts
Radeon HD 6990 375 Watts
Difference: 145 Watts (63%)

Memory Bandwidth

In theory, the Radeon HD 6990 should be quite a bit faster than the Geforce GTX 770 overall. (explain)

Radeon HD 6990 320000 MB/sec
Geforce GTX 770 224384 MB/sec
Difference: 95616 (43%)

Texel Rate

The Radeon HD 6990 is just a bit (about 19%) better at anisotropic filtering than the Geforce GTX 770. (explain)

Radeon HD 6990 159360 Mtexels/sec
Geforce GTX 770 133888 Mtexels/sec
Difference: 25472 (19%)

Pixel Rate

The Radeon HD 6990 should be quite a bit (approximately 59%) more effective at FSAA than the Geforce GTX 770, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6990 53120 Mpixels/sec
Geforce GTX 770 33472 Mpixels/sec
Difference: 19648 (59%)

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 770

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 770 Radeon HD 6990
Manufacturer nVidia AMD
Year May 2013 March 2011
Code Name GK104 Antilles
Memory 2048 MB 2048 MB (x2)
Core Speed 1046 MHz 830 MHz (x2)
Memory Speed 7012 MHz 5000 MHz (x2)
Power (Max TDP) 230 watts 375 watts
Bandwidth 224384 MB/sec 320000 MB/sec
Texel Rate 133888 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 1536 1536 (x2)
Texture Mapping Units 128 96 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 28 nm 40 nm
Transistors 3540 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 data (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better 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 maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. 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 output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Geforce GTX 770

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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