GeForce 8400 GS 512MB vs GeForce GTS 450 1GB

Intro

Compare that to the GeForce GTS 450 1GB, which comes with core clock speeds of 783 MHz on the GPU, and 902 MHz on the 1024 MB of GDDR5 memory. It features 192 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 66 Watts (165%)

Memory Bandwidth

As far as performance goes, the GeForce GTS 450 1GB should theoretically be much better than the GeForce 8400 GS 512MB overall. (explain)

GeForce GTS 450 1GB		57728 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 51328 (802%)

Texel Rate

The GeForce GTS 450 1GB should be a lot (approximately 382%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 19856 (382%)

Pixel Rate

The GeForce GTS 450 1GB is much (about 382%) better at AA than the GeForce 8400 GS 512MB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 9928 (382%)

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 MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the 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 record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.