Radeon HD 4670 512MB vs Radeon HD 6670 (OEM)

Intro

Compare all that to the Radeon HD 6670 (OEM), which uses a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this particular card. 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)		63 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 7 Watts (11%)

Memory Bandwidth

Performance-wise, the Radeon HD 6670 (OEM) should theoretically be much superior to the Radeon HD 4670 512MB overall. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 32000 (100%)

Texel Rate

The Radeon HD 4670 512MB should be quite a bit (about 25%) faster with regards to AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

The Radeon HD 6670 (OEM) is just a bit (approximately 7%) faster with regards to full screen anti-aliasing than the Radeon HD 4670 512MB, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 6670 (OEM)		6400 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 400 (7%)

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 data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the 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 the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.