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GeForce GT 420 vs Radeon HD 4670 1GB

Intro

The GeForce GT 420 makes use of a 40 nm design. nVidia has clocked the core speed at 700 MHz. The GDDR3 memory is set to run at a speed of 900 MHz on this specific model. It features 48 SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare all of that to the Radeon HD 4670 1GB, which uses a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM runs at a speed of 1100 MHz on this model. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 4670 1GB 70 Watts
Difference: 20 Watts (40%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should in theory be a lot superior to the GeForce GT 420 overall. (explain)

Radeon HD 4670 1GB 35200 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 6400 (22%)

Texel Rate

The Radeon HD 4670 1GB will be much (approximately 329%) faster with regards to texture filtering than the GeForce GT 420. (explain)

Radeon HD 4670 1GB 24000 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 18400 (329%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4670 1GB is superior to the GeForce GT 420, by far. (explain)

Radeon HD 4670 1GB 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

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GeForce GT 420

Amazon.com

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Radeon HD 4670 1GB

Amazon.com

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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 1GB
Manufacturer nVidia AMD
Year September 2010 Sep 10, 2008
Code Name GF108 RV730 XT
Memory 2048 MB 1024 MB
Core Speed 700 MHz 750 MHz
Memory Speed 1800 MHz 2200 MHz
Power (Max TDP) 50 watts 70 watts
Bandwidth 28800 MB/sec 35200 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 max amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, 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 amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 4670 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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