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GeForce GTX 870M vs Radeon HD 4790

Intro

The GeForce GTX 870M comes with core speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 memory. It features 1344 SPUs along with 112 TAUs and 24 Rasterization Operator Units.

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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 will be 7% faster than the GeForce GTX 870M in general, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 870M is much (about 449%) better at texture filtering than the Radeon HD 4790. (explain)

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

Pixel Rate

The GeForce GTX 870M should be quite a bit (more or less 135%) faster with regards to full screen anti-aliasing than the Radeon HD 4790, and able to handle higher resolutions better. (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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If 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 can be applied in one second. This number is calculated by multiplying the total amount 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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