Radeon HD 4830 512MB vs Radeon HD 6670 (OEM)

Intro

Compare those specifications to the Radeon HD 6670 (OEM), which uses a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory runs at a speed of 1000 MHz on this specific card. It features 480 SPUs as well as 24 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 32 Watts (51%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) should be 11% quicker than the Radeon HD 4830 512MB in general, due to its higher data rate. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The Radeon HD 6670 (OEM) should be a small bit (more or less 4%) better at texture filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 800 (4%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4830 512MB is the winner, by a large margin. (explain)

Radeon HD 4830 512MB		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: Memory bandwidth is the max amount of information (in units of MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 are applied per second. This figure is calculated 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 video card will be at handling 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 chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.