GeForce GT 450 (OEM) vs GeForce GTX 580

Intro

Compare those specifications to the GeForce GTX 580, which has core clock speeds of 772 MHz on the GPU, and 1002 MHz on the 1536 MB of GDDR5 RAM. It features 512 SPUs as well as 64 Texture Address Units and 48 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
GeForce GTX 580		244 Watts
	Difference: 138 Watts (130%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 580 should theoretically be much superior to the GeForce GT 450 (OEM) overall. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 96384 (100%)

Texel Rate

The GeForce GTX 580 will be a lot (approximately 161%) better at AF than the GeForce GT 450 (OEM). (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 30448 (161%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 580 is a better choice, and very much so. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 18096 (95%)

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 (in units of MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be processed in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, 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 number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.