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GeForce GTX 650 Ti vs Radeon HD 7870

Intro

The GeForce GTX 650 Ti comes with core clock speeds of 928 MHz on the GPU, and 1350 MHz on the 1024 MB of GDDR5 memory. It features 768 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare all of 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 memory works at a speed of 1200 MHz on this particular model. It features 1280 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 110 Watts
Radeon HD 7870 175 Watts
Difference: 65 Watts (59%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 should be 78% faster than the GeForce GTX 650 Ti overall, due to its higher data rate. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GTX 650 Ti 86400 MB/sec
Difference: 67200 (78%)

Texel Rate

The Radeon HD 7870 is quite a bit (about 35%) better at AF than the GeForce GTX 650 Ti. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTX 650 Ti 59392 Mtexels/sec
Difference: 20608 (35%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7870 is a better choice, and very much so. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTX 650 Ti 14848 Mpixels/sec
Difference: 17152 (116%)

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 650 Ti

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 650 Ti Radeon HD 7870
Manufacturer nVidia AMD
Year October 2012 March 2012
Code Name GK106 Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 928 MHz 1000 MHz
Memory Speed 5400 MHz 4800 MHz
Power (Max TDP) 110 watts 175 watts
Bandwidth 86400 MB/sec 153600 MB/sec
Texel Rate 59392 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 768 1280
Texture Mapping Units 64 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2540 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 largest amount of information (counted in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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

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