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GeForce GT 420 vs Radeon HD 3470 256MB

Intro

The GeForce GT 420 features core speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 memory. It features 48 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 3470 256MB, which uses a 55 nm design. AMD has set the core speed at 800 MHz. The DDR2 memory runs at a speed of 950 MHz on this particular model. It features 40(8x5) SPUs along with 4 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3470 256MB should perform a little bit faster than the GeForce GT 420 overall. (explain)

Radeon HD 3470 256MB 30400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 1600 (6%)

Texel Rate

The GeForce GT 420 should be quite a bit (approximately 75%) more effective at texture filtering than the Radeon HD 3470 256MB. (explain)

GeForce GT 420 5600 Mtexels/sec
Radeon HD 3470 256MB 3200 Mtexels/sec
Difference: 2400 (75%)

Pixel Rate

The Radeon HD 3470 256MB will be just a bit (about 14%) more effective at AA than the GeForce GT 420, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3470 256MB 3200 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 400 (14%)

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 3470 256MB

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 3470 256MB
Manufacturer nVidia AMD
Year September 2010 2008
Code Name GF108 RV620 PRO
Memory 2048 MB 256 MB
Core Speed 700 MHz 800 MHz
Memory Speed 1800 MHz 1900 MHz
Power (Max TDP) 50 watts (Unknown) watts
Bandwidth 28800 MB/sec 30400 MB/sec
Texel Rate 5600 Mtexels/sec 3200 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 3200 Mpixels/sec
Unified Shaders 48 40(8x5)
Texture Mapping Units 8 4
Render Output Units 4 4
Bus Type GDDR3 DDR2
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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3470 256MB

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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