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GeForce GTX 970M vs Radeon HD 4790

Intro

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

Compare those specifications to the Radeon HD 4790, which makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR5 memory is set to run at a speed of 800 MHz on this particular model. 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

As far as performance goes, the Radeon HD 4790 should in theory be a little bit superior to 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 is much (approximately 285%) more effective at texture filtering than the Radeon HD 4790. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 970M is a better choice, by far. (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

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 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 (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core 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 card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max 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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