GeForce 8400 GS 512MB vs Radeon HD 6670 (OEM)

Intro

Compare those specifications to the Radeon HD 6670 (OEM), which makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this 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)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 6670 (OEM)		63 Watts
	Difference: 23 Watts (58%)

Memory Bandwidth

The Radeon HD 6670 (OEM) should in theory perform a lot faster than the GeForce 8400 GS 512MB overall. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The Radeon HD 6670 (OEM) should be a lot (more or less 269%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 14000 (269%)

Pixel Rate

The Radeon HD 6670 (OEM) should be much (approximately 146%) faster with regards to anti-aliasing than the GeForce 8400 GS 512MB, and should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6670 (OEM)		6400 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 3800 (146%)

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 largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video 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 maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.