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GeForce GTX 870M vs Radeon HD 4870 X2

Intro

The GeForce GTX 870M features a GPU core clock speed of 941 MHz, and the 3072 MB of GDDR5 RAM is set to run at 1000 MHz through a 192-bit bus. It also is made up of 1344 SPUs, 112 Texture Address Units, and 24 Raster Operation Units.

Compare that to the Radeon HD 4870 X2, which comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M 110 Watts
Radeon HD 4870 X2 350 Watts
Difference: 240 Watts (218%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 should perform a lot faster than the GeForce GTX 870M overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 134400 (140%)

Texel Rate

The GeForce GTX 870M should be a lot (approximately 76%) faster with regards to AF than the Radeon HD 4870 X2. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 45392 (76%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 X2 is a better choice, but only just. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GTX 870M 22584 Mpixels/sec
Difference: 1416 (6%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 870M Radeon HD 4870 X2
Manufacturer nVidia AMD
Year March 12 2014 Aug 12, 2008
Code Name GK104 R700
Memory 3072 MB 1024 MB (x2)
Core Speed 941 MHz 750 MHz (x2)
Memory Speed 4000 MHz 3600 MHz (x2)
Power (Max TDP) 110 watts 350 watts
Bandwidth 96000 MB/sec 230400 MB/sec
Texel Rate 105392 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 1344 800(160x5) (x2)
Texture Mapping Units 112 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
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 across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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