GeForce 8400 GS 512MB vs Radeon HD 6670 (OEM) 1GB

Intro

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which uses a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this specific card. It features 480 SPUs as well as 24 Texture Address Units and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 6670 (OEM) 1GB		63 Watts
	Difference: 23 Watts (58%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6670 (OEM) 1GB should in theory be a lot superior to the GeForce 8400 GS 512MB in general. (explain)

Radeon HD 6670 (OEM) 1GB		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB is much (about 269%) better at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6670 (OEM) 1GB		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) 1GB is the winner, and very much so. (explain)

Radeon HD 6670 (OEM) 1GB		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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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