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GeForce GTX 870M vs Radeon HD 4870 512MB

Intro

The GeForce GTX 870M comes with a clock frequency of 941 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 192-bit memory bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 Texture Address Units, and 24 ROPs.

Compare that to the Radeon HD 4870 512MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory is set to run at a frequency of 900 MHz on this card. It features 800(160x5) SPUs as well as 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 512MB 150 Watts
Difference: 40 Watts (36%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 512MB should theoretically be a small bit superior to the GeForce GTX 870M overall. (explain)

Radeon HD 4870 512MB 115200 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The GeForce GTX 870M is a lot (more or less 251%) better at AF than the Radeon HD 4870 512MB. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 75392 (251%)

Pixel Rate

The GeForce GTX 870M will be quite a bit (about 88%) faster with regards to FSAA than the Radeon HD 4870 512MB, and also able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon HD 4870 512MB 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 512MB

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 512MB
Manufacturer nVidia AMD
Year March 12 2014 Jun 25, 2008
Code Name GK104 RV770 XT
Memory 3072 MB 512 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 moved over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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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