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GeForce GTX 870M vs Radeon HD 4870 2GB

Intro

The GeForce GTX 870M features a GPU core speed of 941 MHz, and the 3072 MB of GDDR5 memory runs at 1000 MHz through a 192-bit bus. It also is comprised of 1344 SPUs, 112 TAUs, and 24 Raster Operation Units.

Compare that to the Radeon HD 4870 2GB, which uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs 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 2GB 150 Watts
Difference: 40 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should perform just a bit faster than the GeForce GTX 870M in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The GeForce GTX 870M is a lot (about 251%) more effective at anisotropic filtering than the Radeon HD 4870 2GB. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 75392 (251%)

Pixel Rate

The GeForce GTX 870M will be a lot (approximately 88%) faster with regards to FSAA than the Radeon HD 4870 2GB, and capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 10584 (88%)

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

Check prices at:

Radeon HD 4870 2GB

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 2GB
Manufacturer nVidia AMD
Year March 12 2014 Jun 25, 2008
Code Name GK104 RV770 XT
Memory 3072 MB 2048 MB
Core Speed 941 MHz 750 MHz
Memory Speed 4000 MHz 3600 MHz
Power (Max TDP) 110 watts 150 watts
Bandwidth 96000 MB/sec 115200 MB/sec
Texel Rate 105392 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 1344 800(160x5)
Texture Mapping Units 112 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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