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Geforce GTX 770 vs Radeon HD 7870

Intro

The Geforce GTX 770 has a GPU core speed of 1046 MHz, and the 2048 MB of GDDR5 memory runs at 1753 MHz through a 256-bit bus. It also features 1536 Stream Processors, 128 TAUs, and 32 ROPs.

Compare all that to the Radeon HD 7870, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this specific card. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Geforce GTX 770 230 Watts
Difference: 55 Watts (31%)

Memory Bandwidth

Performance-wise, the Geforce GTX 770 should theoretically be a lot better than the Radeon HD 7870 overall. (explain)

Geforce GTX 770 224384 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 70784 (46%)

Texel Rate

The Geforce GTX 770 is much (about 67%) faster with regards to texture filtering than the Radeon HD 7870. (explain)

Geforce GTX 770 133888 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 53888 (67%)

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 770 is the winner, though not by far. (explain)

Geforce GTX 770 33472 Mpixels/sec
Radeon HD 7870 32000 Mpixels/sec
Difference: 1472 (5%)

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.

Price Comparison

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Geforce GTX 770

Amazon.com

Radeon HD 7870

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 7870
Manufacturer nVidia AMD
Year May 2013 March 2012
Code Name GK104 Pitcairn XT
Memory 2048 MB 2048 MB
Core Speed 1046 MHz 1000 MHz
Memory Speed 7012 MHz 4800 MHz
Power (Max TDP) 230 watts 175 watts
Bandwidth 224384 MB/sec 153600 MB/sec
Texel Rate 133888 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1536 1280
Texture Mapping Units 128 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 3540 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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