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

Intro

Compare those specs to the Radeon HD 6670 (OEM), which has clock speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 480 SPUs along with 24 TAUs and 8 Rasterization Operator Units.

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

Theoretically speaking, the Radeon HD 6670 (OEM) is 900% faster than the GeForce 8400 GS 512MB overall, due to its greater bandwidth. (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 (about 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

If running with a high resolution is important to you, then the Radeon HD 6670 (OEM) is the winner, and very much so. (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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the 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 the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.