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GeForce GTX 860M vs Radeon HD 3870 1GB

Intro

The GeForce GTX 860M has a clock speed of 797 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 1152 SPUs, 96 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 3870 1GB, which features a core clock frequency of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M 45 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 61 Watts (136%)

Memory Bandwidth

In theory, the Radeon HD 3870 1GB is 13% quicker than the GeForce GTX 860M overall, because of its greater bandwidth. (explain)

Radeon HD 3870 1GB 72000 MB/sec
GeForce GTX 860M 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The GeForce GTX 860M will be much (about 517%) better at texture filtering than the Radeon HD 3870 1GB. (explain)

GeForce GTX 860M 76512 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 64112 (517%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 860M is the winner, but not by far. (explain)

GeForce GTX 860M 12752 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 352 (3%)

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 860M

Amazon.com

Check prices at:

Radeon HD 3870 1GB

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.

Specifications

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Model GeForce GTX 860M Radeon HD 3870 1GB
Manufacturer nVidia AMD
Year March 12 2014 Nov 19, 2007
Code Name GM107 RV670 XT
Memory 4096 MB 1024 MB
Core Speed 797 MHz 775 MHz
Memory Speed 4000 MHz 2250 MHz
Power (Max TDP) 45 watts 106 watts
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 76512 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 12752 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 1152 320(64x5)
Texture Mapping Units 96 16
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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

Display Prices

Hide Prices

GeForce GTX 860M

Amazon.com

Check prices at:

Radeon HD 3870 1GB

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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