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GeForce GT 420 vs Radeon HD 4670 512MB

Intro

The GeForce GT 420 has a clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It features 48 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 4670 512MB, which comes with a clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1000 MHz. It also features a 128-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 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 4670 512MB 70 Watts
Difference: 20 Watts (40%)

Memory Bandwidth

The Radeon HD 4670 512MB should theoretically perform a little bit faster than the GeForce GT 420 in general. (explain)

Radeon HD 4670 512MB 32000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 3200 (11%)

Texel Rate

The Radeon HD 4670 512MB should be a lot (more or less 329%) better at AF than the GeForce GT 420. (explain)

Radeon HD 4670 512MB 24000 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 18400 (329%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4670 512MB is the winner, by a large margin. (explain)

Radeon HD 4670 512MB 6000 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 3200 (114%)

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 4670 512MB

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 4670 512MB
Manufacturer nVidia AMD
Year September 2010 Sep 10, 2008
Code Name GF108 RV730 XT
Memory 2048 MB 512 MB
Core Speed 700 MHz 750 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 50 watts 70 watts
Bandwidth 28800 MB/sec 32000 MB/sec
Texel Rate 5600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 48 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 585 million 514 million
Bus PCIe x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 4670 512MB

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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