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


Intro

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

Compare that to the Radeon HD 6670 (OEM) 1GB, which has core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 480 SPUs as well as 24 Texture Address Units 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 6670 (OEM) 1GB 63 Watts
Difference: 13 Watts (26%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) 1GB should perform much faster than the GeForce GT 420 in general. (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 is a lot (about 243%) faster with regards to AF 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 6670 (OEM) 1GB is superior to the GeForce GT 420, by far. (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

GeForce GT 420

Radeon HD 6670 (OEM) 1GB

Specifications

Display 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 (measured in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GT 420

Radeon HD 6670 (OEM) 1GB

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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