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GeForce GTX 650 vs Radeon HD 6870


Intro

The GeForce GTX 650 comes with a GPU clock speed of 1058 MHz, and the 1024 MB of GDDR5 memory is set to run at 1250 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6870, which comes with a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is made up of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

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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 6870 2870 points
GeForce GTX 650 2270 points
Difference: 600 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 6870 151 Watts
Difference: 87 Watts (136%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 is 68% quicker than the GeForce GTX 650 in general, because of its greater data rate. (explain)

Radeon HD 6870 134400 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 54400 (68%)

Texel Rate

The Radeon HD 6870 is a lot (approximately 49%) faster with regards to AF than the GeForce GTX 650. (explain)

Radeon HD 6870 50400 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 16544 (49%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6870 is the winner, by far. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 11872 (70%)

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 6870

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 6870
Manufacturer nVidia AMD
Year September 2012 October 2010
Code Name GK107 Barts XT
Memory 1024 MB 1024 MB
Core Speed 1058 MHz 900 MHz
Memory Speed 5000 MHz 4200 MHz
Power (Max TDP) 64 watts 151 watts
Bandwidth 80000 MB/sec 134400 MB/sec
Texel Rate 33856 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 384 1120
Texture Mapping Units 32 56
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 max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 650

Amazon.com

Radeon HD 6870

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.

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