GeForce 8400 GS 512MB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare those specifications to the Radeon HD 6570 (OEM) 2GB, which has a GPU core clock speed of 650 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is made up of 480 Stream Processors, 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 6570 (OEM) 2GB		50 Watts
	Difference: 10 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6570 (OEM) 2GB will be 900% quicker than the GeForce 8400 GS 512MB in general, because of its higher bandwidth. (explain)

Radeon HD 6570 (OEM) 2GB		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The Radeon HD 6570 (OEM) 2GB should be a lot (more or less 200%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 10400 (200%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6570 (OEM) 2GB is the winner, and very much so. (explain)

Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 2600 (100%)

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 information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 can be processed in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.