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GeForce GTX 880M vs Radeon HD 4790

Intro

The GeForce GTX 880M uses a 28 nm design. nVidia has set the core speed at 954 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this card. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 4790, which has GPU clock speed of 600 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 880M should theoretically perform a lot faster than the Radeon HD 4790 in general. (explain)

GeForce GTX 880M 128000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 25600 (25%)

Texel Rate

The GeForce GTX 880M will be quite a bit (more or less 536%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

GeForce GTX 880M 122112 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 102912 (536%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 880M is a better choice, by a large margin. (explain)

GeForce GTX 880M 30528 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 20928 (218%)

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 880M

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 880M Radeon HD 4790
Manufacturer nVidia AMD
Year March 12 2014 2009
Code Name GK104 RV790
Memory 4096 MB 512 MB
Core Speed 954 MHz 600 MHz
Memory Speed 4000 MHz 3200 MHz
Power (Max TDP) 130 watts (Unknown) watts
Bandwidth 128000 MB/sec 102400 MB/sec
Texel Rate 122112 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 30528 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 1536 640(128x5)
Texture Mapping Units 128 32
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-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 max amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 880M

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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