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GeForce GT 420 vs Radeon HD 6670 (OEM) 1GB

Intro

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

Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this particular model. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 6670 (OEM) 1GB 63 Watts
Difference: 13 Watts (26%)

Memory Bandwidth

Theoretically, the Radeon HD 6670 (OEM) 1GB should perform much faster than the GeForce GT 420 overall. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 35200 (122%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB will be much (more or less 243%) better at anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 13600 (243%)

Pixel Rate

The Radeon HD 6670 (OEM) 1GB will be much (approximately 129%) better at FSAA than the GeForce GT 420, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 3600 (129%)

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

Radeon HD 6670 (OEM) 1GB

Amazon.com

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 6670 (OEM) 1GB
Manufacturer nVidia AMD
Year September 2010 February 2011
Code Name GF108 Turks
Memory 2048 MB 1024 MB
Core Speed 700 MHz 800 MHz
Memory Speed 1800 MHz 4000 MHz
Power (Max TDP) 50 watts 63 watts
Bandwidth 28800 MB/sec 64000 MB/sec
Texel Rate 5600 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 48 480
Texture Mapping Units 8 24
Render Output Units 4 8
Bus Type GDDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 585 million 715 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Comments

One Response to “GeForce GT 420 vs Radeon HD 6670 (OEM) 1GB”
GTA IV niedrige FPs trotz neuer Grafikkarte says:

[...] oder ist es die CPU, die zu schwach ist? Eine HD 6670 ist zwar nicht superschnell, allerdings (theoretisch) sehr viel schneller als deine Alte, praktisch hab ich nur die GT430 und die HD 6670 im gleichen [...]

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