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GeForce GT 420 vs Radeon HD 3690/3830

Intro

The GeForce GT 420 features a GPU core speed of 700 MHz, and the 2048 MB of GDDR3 RAM runs at 900 MHz through a 128-bit bus. It also features 48 Stream Processors, 8 TAUs, and 4 ROPs.

Compare all that to the Radeon HD 3690/3830, which features a core clock frequency of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 3690/3830 75 Watts
Difference: 25 Watts (50%)

Memory Bandwidth

Theoretically, the GeForce GT 420 should be just a bit faster than the Radeon HD 3690/3830 overall. (explain)

GeForce GT 420 28800 MB/sec
Radeon HD 3690/3830 26496 MB/sec
Difference: 2304 (9%)

Texel Rate

The Radeon HD 3690/3830 is much (about 91%) more effective at texture filtering than the GeForce GT 420. (explain)

Radeon HD 3690/3830 10688 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 5088 (91%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 3690/3830 is a better choice, by far. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 7888 (282%)

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

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3690/3830

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 3690/3830
Manufacturer nVidia AMD
Year September 2010 2008
Code Name GF108 RV670 PRO
Memory 2048 MB 256 MB
Core Speed 700 MHz 668 MHz
Memory Speed 1800 MHz 1656 MHz
Power (Max TDP) 50 watts 75 watts
Bandwidth 28800 MB/sec 26496 MB/sec
Texel Rate 5600 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 48 320(64x5)
Texture Mapping Units 8 16
Render Output Units 4 16
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 585 million (Unknown) 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 max amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling 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 card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3690/3830

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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