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

Intro

Compare all of that to the Radeon HD 6670 (OEM), which makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this specific 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

Theoretically speaking, the Radeon HD 6670 (OEM) is 900% faster than the GeForce 8400 GS 512MB in general, due to its higher data rate. (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 (approximately 269%) better at texture 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 using lots of anti-aliasing is important to you, then the Radeon HD 6670 (OEM) is a better choice, by far. (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 (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.