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GeForce GT 420 vs Radeon HD 4670 512MB

Intro

The GeForce GT 420 comes with a GPU core speed of 700 MHz, and the 2048 MB of GDDR3 RAM runs at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 TAUs, and 4 ROPs.

Compare those specifications to the Radeon HD 4670 512MB, which has clock speeds of 750 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR4/GDDR3/DDR3/DDR2 memory. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

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, in theory, should be a bit faster than the GeForce GT 420 overall. (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 much (about 329%) faster with regards to 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

The Radeon HD 4670 512MB is a lot (about 114%) better at FSAA than the GeForce GT 420, and will be able to handle higher resolutions while still performing well. (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

Display 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 max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max 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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