GeForce GTX 580 3GB vs Radeon HD 6450 (OEM)

Intro

Compare those specs to the Radeon HD 6450 (OEM), which features clock speeds of 625 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 memory. It features 160 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 213 Watts (687%)

Memory Bandwidth

Theoretically, the GeForce GTX 580 3GB should be a lot faster than the Radeon HD 6450 (OEM) in general. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 179584 (1403%)

Texel Rate

The GeForce GTX 580 3GB should be a lot (more or less 888%) better at AF than the Radeon HD 6450 (OEM). (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 44408 (888%)

Pixel Rate

The GeForce GTX 580 3GB will be much (approximately 1382%) more effective at FSAA than the Radeon HD 6450 (OEM), and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 34556 (1382%)

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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one 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 sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.