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GeForce GTX 850M vs Radeon HD 4870 2GB

Intro

The GeForce GTX 850M comes with clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 4870 2GB, which features GPU core speed of 750 MHz, and 2048 MB of GDDR5 RAM set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M 40 Watts
Radeon HD 4870 2GB 150 Watts
Difference: 110 Watts (275%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 2GB should in theory be a lot better than the GeForce GTX 850M in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce GTX 850M 32000 MB/sec
Difference: 83200 (260%)

Texel Rate

The GeForce GTX 850M should be a little bit (about 17%) faster with regards to AF than the Radeon HD 4870 2GB. (explain)

GeForce GTX 850M 35040 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 5040 (17%)

Pixel Rate

The GeForce GTX 850M will be just a bit (about 17%) faster with regards to FSAA than the Radeon HD 4870 2GB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 850M 14016 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 2016 (17%)

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 850M

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 850M Radeon HD 4870 2GB
Manufacturer nVidia AMD
Year March 12 2014 Jun 25, 2008
Code Name GM107 RV770 XT
Memory 2048 MB 2048 MB
Core Speed 876 MHz 750 MHz
Memory Speed 2000 MHz 3600 MHz
Power (Max TDP) 40 watts 150 watts
Bandwidth 32000 MB/sec 115200 MB/sec
Texel Rate 35040 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 14016 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 640 800(160x5)
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-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 data (in units of MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 850M

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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