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GeForce GTX 980M vs Radeon HD 4790

Intro

The GeForce GTX 980M features a clock frequency of 1038 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It features 1536 SPUs, 96 TAUs, and 64 ROPs.

Compare all that to the Radeon HD 4790, which uses a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR5 memory works at a frequency of 800 MHz on this specific card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 980M should theoretically be a lot superior to the Radeon HD 4790 overall. (explain)

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

Texel Rate

The GeForce GTX 980M should be quite a bit (approximately 419%) faster with regards to anisotropic 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 high levels of AA is important to you, then the GeForce GTX 980M is the winner, by far. (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

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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 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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core clock 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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