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GeForce GT 420 vs Radeon HD 3470 256MB

Intro

The GeForce GT 420 makes use of a 40 nm design. nVidia has set the core frequency at 700 MHz. The GDDR3 RAM is set to run at a frequency of 900 MHz on this particular model. It features 48 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 3470 256MB, which has clock speeds of 800 MHz on the GPU, and 950 MHz on the 256 MB of DDR2 memory. It features 40(8x5) SPUs as well as 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 is 6% faster than the GeForce GT 420 in general, due to its higher data rate. (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 a lot (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

If running with high levels of AA is important to you, then the Radeon HD 3470 256MB is a better choice, though not by far. (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

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 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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to 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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