GeForce 8800 GTS (G80) 320MB vs GeForce GTS 450

Intro

Compare those specs to the GeForce GTS 450, which comes with a core clock speed of 783 MHz and a GDDR5 memory speed of 902 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 192 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450		106 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 37 Watts (35%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 320MB will be 10% faster than the GeForce GTS 450 overall, because of its greater bandwidth. (explain)

GeForce 8800 GTS (G80) 320MB		63360 MB/sec
GeForce GTS 450		57728 MB/sec
	Difference: 5632 (10%)

Texel Rate

The GeForce GTS 450 will be a bit (more or less 2%) better at anisotropic filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 432 (2%)

Pixel Rate

The GeForce GTS 450 should be much (more or less 22%) more effective at full screen anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and also should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.