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GeForce GTX 650 vs Radeon HD 6850


Intro

The GeForce GTX 650 uses a 28 nm design. nVidia has set the core speed at 1058 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this specific model. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6850, which has core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs as well as 48 TAUs 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

In theory, the Radeon HD 6850 should be 60% quicker than the GeForce GTX 650 in general, due to its higher bandwidth. (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 using a high resolution is important to you, then the Radeon HD 6850 is a better choice, and very much so. (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

Display 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 (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant 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.

GeForce GTX 650

Radeon HD 6850

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