Radeon HD 4850 1GB vs Radeon HD 6670 (OEM) 1GB

Intro

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 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) 1GB		63 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 47 Watts (75%)

Memory Bandwidth

The Radeon HD 6670 (OEM) 1GB, in theory, should perform a little bit faster than the Radeon HD 4850 1GB overall. (explain)

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

Texel Rate

The Radeon HD 4850 1GB should be quite a bit (approximately 30%) faster with regards to anisotropic filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 5800 (30%)

Pixel Rate

The Radeon HD 4850 1GB is quite a bit (more or less 56%) better at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also able to handle higher resolutions better. (explain)

Radeon HD 4850 1GB		10000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR 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 worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.