GeForce 8800 GTS (G80) 640MB vs GeForce GTS 450 1GB

Intro

Compare all that to the GeForce GTS 450 1GB, which comes with GPU core speed of 783 MHz, and 1024 MB of GDDR5 RAM running at 902 MHz through a 128-bit bus. It also is made up of 192 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB		106 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 37 Watts (35%)

Memory Bandwidth

The GeForce 8800 GTS (G80) 640MB, in theory, should perform a little bit faster than the GeForce GTS 450 1GB overall. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 5632 (10%)

Texel Rate

The GeForce GTS 450 1GB will be a little bit (about 2%) better at anisotropic filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 432 (2%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTS 450 1GB is superior to the GeForce 8800 GTS (G80) 640MB, and very much so. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 2268 (22%)

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 information (in units of MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines 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 max fill rate.