Radeon HD 4670 1GB vs Radeon HD 6850

Intro

Compare those specifications to the Radeon HD 6850, which comes with a core clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 960 SPUs, 48 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 6850		127 Watts
	Difference: 57 Watts (81%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6850 should in theory be a lot superior to the Radeon HD 4670 1GB overall. (explain)

Radeon HD 6850		128000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 92800 (264%)

Texel Rate

The Radeon HD 6850 should be much (more or less 55%) better at AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 6850		37200 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 13200 (55%)

Pixel Rate

The Radeon HD 6850 should be much (approximately 313%) faster with regards to full screen anti-aliasing than the Radeon HD 4670 1GB, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6850		24800 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 18800 (313%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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