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GeForce GTX 650 vs Radeon HD 6850


Intro

The GeForce GTX 650 has a GPU core speed of 1058 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1250 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6850, which comes with a clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is made up of 960 SPUs, 48 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6850 2395 points
GeForce GTX 650 2270 points
Difference: 125 (6%)

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 in theory be a lot superior to 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 is just a bit (more or less 10%) better at 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

If running with a high screen resolution is important to you, then the Radeon HD 6850 is a better choice, by far. (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

GeForce GTX 650

Radeon HD 6850

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 1024 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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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

GeForce GTX 650

Radeon HD 6850

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