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GeForce GTX 980M vs Radeon HD 4790

Intro

The GeForce GTX 980M has clock speeds of 1038 MHz on the GPU, and 1000 MHz on the 4096 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs and 64 Rasterization Operator Units.

Compare all of that to the Radeon HD 4790, which features clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 25% quicker than the Radeon HD 4790 overall, due to its greater data rate. (explain)

GeForce GTX 980M 128000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 25600 (25%)

Texel Rate

The GeForce GTX 980M should be much (more or less 419%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 980M 99648 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 80448 (419%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 980M is the winner, by a large margin. (explain)

GeForce GTX 980M 66432 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 56832 (592%)

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 980M

Amazon.com

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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 980M Radeon HD 4790
Manufacturer nVidia AMD
Year October 7 2014 2009
Code Name GM204 RV790
Memory 4096 MB 512 MB
Core Speed 1038 MHz 600 MHz
Memory Speed 4000 MHz 3200 MHz
Power (Max TDP) 100 watts (Unknown) watts
Bandwidth 128000 MB/sec 102400 MB/sec
Texel Rate 99648 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 66432 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 1536 640(128x5)
Texture Mapping Units 96 32
Render Output Units 64 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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 980M

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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