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Geforce GTX 770 vs Radeon HD 7990

Intro

The Geforce GTX 770 uses a 28 nm design. nVidia has clocked the core frequency at 1046 MHz. The GDDR5 memory works at a speed of 1753 MHz on this particular card. It features 1536 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core speed at 950 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

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

Performance-wise, the Radeon HD 7990 should in theory be a lot better 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 a lot (more or less 82%) more effective at anisotropic filtering than the Geforce GTX 770. (explain)

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

Pixel Rate

The Radeon HD 7990 will be a lot (approximately 82%) faster with regards to FSAA than the Geforce GTX 770, and also should be capable of handling higher screen resolutions without losing too much performance. (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

Display 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 1753 MHz (7012 MHz effective) 1500 MHz (6000 MHz effective) (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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to 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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