GeForce 8500 GT vs GeForce GTS 450

Intro

Compare all of that to the GeForce GTS 450, which features a GPU core clock speed of 783 MHz, and 512 MB of GDDR5 memory running at 902 MHz through a 128-bit bus. It also is comprised of 192 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT		45 Watts
GeForce GTS 450		106 Watts
	Difference: 61 Watts (136%)

Memory Bandwidth

Theoretically, the GeForce GTS 450 should be much faster than the GeForce 8500 GT in general. (explain)

GeForce GTS 450		57728 MB/sec
GeForce 8500 GT		12800 MB/sec
	Difference: 44928 (351%)

Texel Rate

The GeForce GTS 450 is quite a bit (about 596%) better at AF than the GeForce 8500 GT. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce 8500 GT		3600 Mtexels/sec
	Difference: 21456 (596%)

Pixel Rate

The GeForce GTS 450 is a lot (about 596%) better at full screen anti-aliasing than the GeForce 8500 GT, and also capable of handling higher screen resolutions better. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce 8500 GT		1800 Mpixels/sec
	Difference: 10728 (596%)

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 max amount of information (counted in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one 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 better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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