Radeon HD 4850 2GB vs Radeon HD 6670 (OEM)

Intro

Compare those specs to the Radeon HD 6670 (OEM), which features GPU clock speed of 800 MHz, and 512 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is comprised of 480 SPUs, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 47 Watts (75%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) should be 1% quicker than the Radeon HD 4850 2GB overall, because of its greater bandwidth. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 448 (1%)

Texel Rate

The Radeon HD 4850 2GB should be much (about 30%) more effective at texture filtering than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 5800 (30%)

Pixel Rate

The Radeon HD 4850 2GB should be much (more or less 56%) faster with regards to anti-aliasing than the Radeon HD 6670 (OEM), and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 3600 (56%)

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 max amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.