GeForce GTX 580 vs Radeon HD 5450

Intro

Compare that to the Radeon HD 5450, which features a GPU core clock speed of 650 MHz, and 512 MB of DDR3 memory running at 800 MHz through a 64-bit bus. It also features 80(16x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
GeForce GTX 580		244 Watts
	Difference: 225 Watts (1184%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 should be 1403% faster than the Radeon HD 5450 in general, due to its greater data rate. (explain)

GeForce GTX 580		192384 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 179584 (1403%)

Texel Rate

The GeForce GTX 580 should be a lot (approximately 850%) more effective at texture filtering than the Radeon HD 5450. (explain)

GeForce GTX 580		49408 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 44208 (850%)

Pixel Rate

The GeForce GTX 580 should be a lot (more or less 1325%) better at full screen anti-aliasing than the Radeon HD 5450, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 580		37056 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 34456 (1325%)

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

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