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GeForce GTX 870M vs Radeon HD 4790

Intro

The GeForce GTX 870M comes with a GPU core clock speed of 941 MHz, and the 3072 MB of GDDR5 RAM runs at 1000 MHz through a 192-bit bus. It also is comprised of 1344 Stream Processors, 112 Texture Address Units, and 24 ROPs.

Compare those specs to the Radeon HD 4790, which uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR5 memory runs at a frequency of 800 MHz on this specific card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4790 should perform a bit faster than the GeForce GTX 870M overall. (explain)

Radeon HD 4790 102400 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 6400 (7%)

Texel Rate

The GeForce GTX 870M should be much (approximately 449%) better at AF than the Radeon HD 4790. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 86192 (449%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is a better choice, by far. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 12984 (135%)

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 4790

Amazon.com

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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 4790
Manufacturer nVidia AMD
Year March 12 2014 2009
Code Name GK104 RV790
Memory 3072 MB 512 MB
Core Speed 941 MHz 600 MHz
Memory Speed 4000 MHz 3200 MHz
Power (Max TDP) 110 watts (Unknown) watts
Bandwidth 96000 MB/sec 102400 MB/sec
Texel Rate 105392 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 1344 640(128x5)
Texture Mapping Units 112 32
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 959 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 maximum amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 can be processed in one second. This figure is worked out by multiplying the total number 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4790

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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