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Geforce GTX 770 vs Radeon HD 7870

Intro

The Geforce GTX 770 has a core clock frequency of 1046 MHz and a GDDR5 memory frequency of 1753 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1536 SPUs, 128 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 7870, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Display Graphs

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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 in theory be quite a bit better than the Radeon HD 7870 in general. (explain)

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

Texel Rate

The Geforce GTX 770 is much (approximately 67%) more effective at anisotropic 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 running with a high resolution is important to you, then the Geforce GTX 770 is superior to the Radeon HD 7870, but it probably won't make a huge difference. (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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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