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GeForce GTX 870M vs Radeon HD 7790

Intro

The GeForce GTX 870M comes with a GPU clock speed of 941 MHz, and the 3072 MB of GDDR5 RAM is set to run at 1000 MHz through a 192-bit bus. It also is made up of 1344 Stream Processors, 112 TAUs, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 7790, which features a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 870M 4770 points
Radeon HD 7790 4330 points
Difference: 440 (10%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
GeForce GTX 870M 110 Watts
Difference: 25 Watts (29%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The GeForce GTX 870M is quite a bit (more or less 88%) better at texture filtering than the Radeon HD 7790. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 49392 (88%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is superior to the Radeon HD 7790, by far. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 6584 (41%)

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 7790

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 7790
Manufacturer nVidia AMD
Year March 12 2014 March 2013
Code Name GK104 Bonaire XT
Memory 3072 MB 1024 MB
Core Speed 941 MHz 1000 MHz
Memory Speed 4000 MHz 6000 MHz
Power (Max TDP) 110 watts 85 watts
Bandwidth 96000 MB/sec 96000 MB/sec
Texel Rate 105392 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1344 896
Texture Mapping Units 112 56
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 2080 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 11.1
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied 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 amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 7790

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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