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

Intro

Compare all that to the Radeon HD 6670 (OEM) 1GB, which comes with core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 480 SPUs along with 24 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 6670 (OEM) 1GB should perform a small bit faster than the Radeon HD 4830 1GB overall. (explain)

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

Texel Rate

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

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4830 1GB is superior to the Radeon HD 6670 (OEM) 1GB, and very much so. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		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 data (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. 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 is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.