GeForce 8500 GT vs GeForce GTS 450

Intro

Compare those specs to the GeForce GTS 450, which has core speeds of 783 MHz on the GPU, and 902 MHz on the 512 MB of GDDR5 RAM. It features 192 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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

In theory, the GeForce GTS 450 should be 351% faster than the GeForce 8500 GT overall, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTS 450 should be much (about 596%) more effective at texture filtering 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 quite a bit (approximately 596%) faster with regards to full screen anti-aliasing than the GeForce 8500 GT, and will be able to handle higher screen resolutions more effectively. (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 maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.