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GeForce GTX 970M vs Radeon HD 4790

Intro

The GeForce GTX 970M comes with a GPU core clock speed of 924 MHz, and the 3072 MB of GDDR5 RAM runs at 1000 MHz through a 192-bit bus. It also is comprised of 1280 Stream Processors, 80 Texture Address Units, and 48 Raster Operation Units.

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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790 should in theory be just a bit faster than the GeForce GTX 970M overall. (explain)

Radeon HD 4790 102400 MB/sec
GeForce GTX 970M 96000 MB/sec
Difference: 6400 (7%)

Texel Rate

The GeForce GTX 970M should be a lot (approximately 285%) more effective at AF than the Radeon HD 4790. (explain)

GeForce GTX 970M 73920 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 54720 (285%)

Pixel Rate

The GeForce GTX 970M will be much (more or less 362%) faster with regards to FSAA than the Radeon HD 4790, and should be capable of handling higher screen resolutions better. (explain)

GeForce GTX 970M 44352 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 34752 (362%)

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 970M

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 970M Radeon HD 4790
Manufacturer nVidia AMD
Year October 7 2014 2009
Code Name GM204 RV790
Memory 3072 MB 512 MB
Core Speed 924 MHz 600 MHz
Memory Speed 4000 MHz 3200 MHz
Power (Max TDP) 75 watts (Unknown) watts
Bandwidth 96000 MB/sec 102400 MB/sec
Texel Rate 73920 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 44352 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 1280 640(128x5)
Texture Mapping Units 80 32
Render Output Units 48 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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number 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 worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 970M

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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