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Geforce GTX 770 vs Radeon HD 7870

Intro

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

Compare all of that to the Radeon HD 7870, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this specific model. It features 1280 SPUs along with 80 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

Theoretically speaking, the Geforce GTX 770 should be quite a bit faster 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 a lot (about 67%) more effective at 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

The Geforce GTX 770 should be a little bit (about 5%) better at AA than the Radeon HD 7870, and will be capable of handling higher screen resolutions without losing too much performance. (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

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

Model Geforce GTX 770 Radeon HD 7870
Manufacturer nVidia AMD
Year May 2013 March 2012
Code Name GK104 Pitcairn XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 1046 MHz 1000 MHz
Shader Speed 1046 MHz (N/A) MHz
Memory Speed 1753 MHz (7012 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1536 1280
Texture Mapping Units 128 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 230 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 224384 MB/sec 153600 MB/sec
Texel Rate 133888 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 33472 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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