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GeForce GT 420 vs Radeon HD 4790

Intro

The GeForce GT 420 comes with a GPU core clock speed of 700 MHz, and the 2048 MB of GDDR3 RAM is set to run at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 will be 256% quicker than the GeForce GT 420 in general, due to its greater data rate. (explain)

Radeon HD 4790 102400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 73600 (256%)

Texel Rate

The Radeon HD 4790 will be quite a bit (more or less 243%) faster with regards to texture filtering than the GeForce GT 420. (explain)

Radeon HD 4790 19200 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 13600 (243%)

Pixel Rate

The Radeon HD 4790 is quite a bit (approximately 243%) better at FSAA than the GeForce GT 420, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4790 9600 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 6800 (243%)

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 GT 420

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 GT 420 Radeon HD 4790
Manufacturer nVidia AMD
Year September 2010 2009
Code Name GF108 RV790
Memory 2048 MB 512 MB
Core Speed 700 MHz 600 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 50 watts (Unknown) watts
Bandwidth 28800 MB/sec 102400 MB/sec
Texel Rate 5600 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 48 640(128x5)
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 585 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: Bandwidth is the largest amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 the graphics card can possibly record to its local memory per 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 - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GT 420

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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