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GeForce GTX 650 vs Radeon HD 6850

Intro

The GeForce GTX 650 features a core clock speed of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is comprised of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6850, which comes with a clock speed of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It is made up of 960 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 6850 127 Watts
Difference: 63 Watts (98%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should theoretically be much better than the GeForce GTX 650 in general. (explain)

Radeon HD 6850 128000 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 48000 (60%)

Texel Rate

The Radeon HD 6850 will be a bit (approximately 10%) faster with regards to texture filtering than the GeForce GTX 650. (explain)

Radeon HD 6850 37200 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 3344 (10%)

Pixel Rate

The Radeon HD 6850 should be a lot (approximately 47%) faster with regards to AA than the GeForce GTX 650, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6850 24800 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 7872 (47%)

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

Amazon.com

Radeon HD 6850

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 Radeon HD 6850
Manufacturer nVidia AMD
Year September 2012 October 2010
Code Name GK107 Barts Pro
Memory 2048 MB 1024 MB
Core Speed 1058 MHz 775 MHz
Memory Speed 5000 MHz 4000 MHz
Power (Max TDP) 64 watts 127 watts
Bandwidth 80000 MB/sec 128000 MB/sec
Texel Rate 33856 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 384 960
Texture Mapping Units 32 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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