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GeForce GT 420 vs Radeon HD 4870 X2

Intro

The GeForce GT 420 uses a 40 nm design. nVidia has set the core speed at 700 MHz. The GDDR3 memory works at a frequency of 900 MHz on this specific card. It features 48 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 4870 X2, which has a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 4870 X2 350 Watts
Difference: 300 Watts (600%)

Memory Bandwidth

The Radeon HD 4870 X2 should theoretically be quite a bit faster than the GeForce GT 420 in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 201600 (700%)

Texel Rate

The Radeon HD 4870 X2 is a lot (more or less 971%) better at texture filtering than the GeForce GT 420. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 54400 (971%)

Pixel Rate

The Radeon HD 4870 X2 should be much (approximately 757%) better at FSAA than the GeForce GT 420, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 21200 (757%)

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 4870 X2

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 4870 X2
Manufacturer nVidia AMD
Year September 2010 Aug 12, 2008
Code Name GF108 R700
Memory 2048 MB 1024 MB (x2)
Core Speed 700 MHz 750 MHz (x2)
Memory Speed 1800 MHz 3600 MHz (x2)
Power (Max TDP) 50 watts 350 watts
Bandwidth 28800 MB/sec 230400 MB/sec
Texel Rate 5600 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 48 800(160x5) (x2)
Texture Mapping Units 8 40 (x2)
Render Output Units 4 16 (x2)
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 585 million 956 million
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are 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 this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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