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

Intro

Compare all that to the Radeon HD 6670 (OEM), which features core speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 480 SPUs as well as 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

In theory, the Radeon HD 6670 (OEM) is 11% quicker than the Radeon HD 4830 1GB in general, due to its higher bandwidth. (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) should be a bit (more or less 4%) better at anisotropic 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

The Radeon HD 4830 1GB is quite a bit (approximately 44%) more effective at anti-aliasing than the Radeon HD 6670 (OEM), and will be capable of handling higher resolutions while still performing well. (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 largest amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.