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GeForce GTX 460 vs Radeon HD 4790

Intro

The GeForce GTX 460 features a clock frequency of 675 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 192-bit bus, and uses a 40 nm design. It features 336 SPUs, 56 TAUs, and 24 ROPs.

Compare all of that to the Radeon HD 4790, which comes with a GPU core clock speed of 600 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 256-bit bus. It also is made up of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4790 will be 19% quicker than the GeForce GTX 460 overall, because of its greater bandwidth. (explain)

Radeon HD 4790 102400 MB/sec
GeForce GTX 460 86400 MB/sec
Difference: 16000 (19%)

Texel Rate

The GeForce GTX 460 should be quite a bit (more or less 97%) better at texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 460 37800 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 18600 (97%)

Pixel Rate

The GeForce GTX 460 will be a lot (about 69%) better at anti-aliasing than the Radeon HD 4790, and able to handle higher resolutions more effectively. (explain)

GeForce GTX 460 16200 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 6600 (69%)

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 460

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 460 Radeon HD 4790
Manufacturer nVidia AMD
Year July 2010 2009
Code Name GF104 RV790
Memory 768 MB 512 MB
Core Speed 675 MHz 600 MHz
Memory Speed 3600 MHz 3200 MHz
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 86400 MB/sec 102400 MB/sec
Texel Rate 37800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 16200 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 336 640(128x5)
Texture Mapping Units 56 32
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1950 million 959 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 460

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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