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

Intro

Compare those specifications to the Radeon HD 6450 (OEM), which has a core clock speed of 625 MHz and a GDDR3 memory speed of 800 MHz. It also uses a 64-bit memory bus, and makes use of a 40 nm design. It features 160 SPUs, 8 TAUs, and 4 ROPs.

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

As far as performance goes, the GeForce GTX 580 3GB should in theory be quite a bit better 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 is much (approximately 888%) faster with regards to anisotropic filtering 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

If using high levels of AA is important to you, then the GeForce GTX 580 3GB is a better choice, and very much so. (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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling 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 write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.