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GeForce GT 420 vs Radeon HD 3870 X2 1GB

Intro

The GeForce GT 420 comes with a GPU core clock speed of 700 MHz, and the 2048 MB of GDDR3 memory is set to run at 900 MHz through a 128-bit bus. It also is made up of 48 Stream Processors, 8 TAUs, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 X2 1GB, which uses a 55 nm design. AMD has set the core speed at 825 MHz. The GDDR4 memory runs at a speed of 1126 MHz on this card. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 1GB should perform much faster than the GeForce GT 420 in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 115328 (400%)

Texel Rate

The Radeon HD 3870 X2 1GB is much (more or less 371%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 20800 (371%)

Pixel Rate

The Radeon HD 3870 X2 1GB should be a lot (approximately 843%) faster with regards to FSAA than the GeForce GT 420, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 23600 (843%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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 3870 X2 1GB
Manufacturer nVidia AMD
Year September 2010 Jan 28, 2008
Code Name GF108 R680
Memory 2048 MB 1024 MB (x2)
Core Speed 700 MHz 825 MHz (x2)
Memory Speed 1800 MHz 2252 MHz (x2)
Power (Max TDP) 50 watts (Unknown) watts
Bandwidth 28800 MB/sec 144128 MB/sec
Texel Rate 5600 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 48 320(64x5) (x2)
Texture Mapping Units 8 16 (x2)
Render Output Units 4 16 (x2)
Bus Type GDDR3 GDDR4
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 585 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/(internal PCIe 1.1 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 (counted in MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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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