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GeForce GTX 870M vs Radeon HD 6850

Intro

The GeForce GTX 870M has a GPU core clock speed of 941 MHz, and the 3072 MB of GDDR5 RAM runs at 1000 MHz through a 192-bit bus. It also features 1344 SPUs, 112 Texture Address Units, and 24 ROPs.

Compare those specifications to the Radeon HD 6850, which makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this particular model. It features 960 SPUs as well as 48 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

GeForce GTX 870M 4770 points
Radeon HD 6850 2395 points
Difference: 2375 (99%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M 110 Watts
Radeon HD 6850 127 Watts
Difference: 17 Watts (15%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should in theory be a lot better than the GeForce GTX 870M in general. (explain)

Radeon HD 6850 128000 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 32000 (33%)

Texel Rate

The GeForce GTX 870M will be quite a bit (more or less 183%) faster with regards to anisotropic filtering than the Radeon HD 6850. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 68192 (183%)

Pixel Rate

The Radeon HD 6850 should be a little bit (more or less 10%) faster with regards to AA than the GeForce GTX 870M, and also able to handle higher screen resolutions better. (explain)

Radeon HD 6850 24800 Mpixels/sec
GeForce GTX 870M 22584 Mpixels/sec
Difference: 2216 (10%)

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 870M

Amazon.com

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Radeon HD 6850

Amazon.com

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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 870M Radeon HD 6850
Manufacturer nVidia AMD
Year March 12 2014 October 2010
Code Name GK104 Barts Pro
Memory 3072 MB 1024 MB
Core Speed 941 MHz 775 MHz
Memory Speed 4000 MHz 4000 MHz
Power (Max TDP) 110 watts 127 watts
Bandwidth 96000 MB/sec 128000 MB/sec
Texel Rate 105392 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 1344 960
Texture Mapping Units 112 48
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 12 DirectX 11
OpenGL Version OpenGL 4.5 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it must 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 figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many 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

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 6850

Amazon.com

Check prices at:

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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