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GeForce GTX 650 vs Radeon HD 6850

Intro

The GeForce GTX 650 comes with a core clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 6850, which comes with a clock frequency 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 comprised of 960 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

The Radeon HD 6850, in theory, should be much faster 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 little bit (more or less 10%) more effective at AF 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 is quite a bit (approximately 47%) faster with regards to anti-aliasing than the GeForce GTX 650, and should be capable of handling higher resolutions better. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 650

Amazon.com

Other US-based stores

Radeon HD 6850

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 650 Radeon HD 6850
Manufacturer nVidia ATi
Year September 2012 October 2010
Code Name GK107 Barts Pro
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe x16
Memory 2048 MB 1024 MB
Core Speed 1058 MHz 775 MHz
Shader Speed 1058 MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 384 960
Texture Mapping Units 32 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1
Power (Max TDP) 64 watts 127 watts
Shader Model 5.0 5.0
Bandwidth 80000 MB/sec 128000 MB/sec
Texel Rate 33856 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 24800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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