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

Intro

Compare those specifications to the Radeon HD 6670 (OEM), which features a core clock frequency of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 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

The Radeon HD 6670 (OEM) should theoretically perform quite a bit faster than the Radeon HD 4670 512MB in general. (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 will be a lot (approximately 25%) more effective at texture filtering 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 FSAA than the Radeon HD 4670 512MB, and also capable of handling higher screen resolutions while still performing well. (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 maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface 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 bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.