Radeon HD 4830 1GB vs Radeon HD 6670 (OEM)

Intro

Compare all of that to the Radeon HD 6670 (OEM), which features core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. 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)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 32 Watts (51%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) should be a small bit faster than the Radeon HD 4830 1GB overall. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The Radeon HD 6670 (OEM) will be just a bit (more or less 4%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 800 (4%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4830 1GB is the winner, by a large margin. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 2800 (44%)

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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. 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 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 reach the maximum fill rate.