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GeForce GTX 870M vs Radeon HD 4870 1GB

Intro

The GeForce GTX 870M features a GPU core 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 comprised of 1344 Stream Processors, 112 TAUs, and 24 ROPs.

Compare that to the Radeon HD 4870 1GB, which has a clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M 110 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 40 Watts (36%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically perform a bit faster than the GeForce GTX 870M overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The GeForce GTX 870M is quite a bit (more or less 251%) more effective at texture filtering than the Radeon HD 4870 1GB. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 75392 (251%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 870M is a better choice, by a large margin. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon HD 4870 1GB 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

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Radeon HD 4870 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 870M Radeon HD 4870 1GB
Manufacturer nVidia AMD
Year March 12 2014 Jun 25, 2008
Code Name GK104 RV770 XT
Memory 3072 MB 1024 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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's 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 rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 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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