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GeForce GTX 870M vs Radeon HD 4790

Intro

The GeForce GTX 870M uses a 28 nm design. nVidia has clocked the core frequency at 941 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this particular card. It features 1344 SPUs as well as 112 TAUs and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 4790, which features a clock speed of 600 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790 should in theory be a small 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 (about 449%) faster with regards to 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 a high resolution is important to you, then the GeForce GTX 870M is superior to the Radeon HD 4790, and very much so. (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

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.

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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach 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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