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Geforce GTX 770 vs Radeon HD 7990

Intro

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

Compare all that to the Radeon HD 7990, which makes use of a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 memory works at a speed of 1500 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770 230 Watts
Radeon HD 7990 375 Watts
Difference: 145 Watts (63%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform a lot faster than the Geforce GTX 770 overall. (explain)

Radeon HD 7990 576000 MB/sec
Geforce GTX 770 224384 MB/sec
Difference: 351616 (157%)

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 82%) faster with regards to AF than the Geforce GTX 770. (explain)

Radeon HD 7990 243200 Mtexels/sec
Geforce GTX 770 133888 Mtexels/sec
Difference: 109312 (82%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is a better choice, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Geforce GTX 770 33472 Mpixels/sec
Difference: 27328 (82%)

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

Radeon HD 7990

Amazon.com

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 7990
Manufacturer nVidia AMD
Year May 2013 April 2013
Code Name GK104 Malta
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB (x2)
Core Speed 1046 MHz 950 MHz (x2)
Shader Speed 1046 MHz (N/A) MHz (x2)
Memory Speed 7012 MHz 6000 MHz (x2)
Unified Shaders 1536 2048 (x2)
Texture Mapping Units 128 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 230 watts 375 watts
Shader Model 5.0 5.0
Bandwidth 224384 MB/sec 576000 MB/sec
Texel Rate 133888 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 60800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Comments

2 Responses to “Geforce GTX 770 vs Radeon HD 7990”
Anonymous says:

nice compare !

Anonymous says:

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