GeForce 825M vs GeForce 8500 GT

Intro

Compare all that to the GeForce 8500 GT, which uses a 80 nm design. nVidia has clocked the core speed at 450 MHz. The DDR2 RAM is set to run at a speed of 400 MHz on this model. It features 16 SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce 8500 GT		45 Watts
	Difference: 12 Watts (36%)

Memory Bandwidth

In theory, the GeForce 825M is 13% faster than the GeForce 8500 GT in general, because of its greater bandwidth. (explain)

GeForce 825M		14400 MB/sec
GeForce 8500 GT		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 825M should be much (more or less 278%) faster with regards to texture filtering than the GeForce 8500 GT. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 8500 GT		3600 Mtexels/sec
	Difference: 10000 (278%)

Pixel Rate

The GeForce 825M is much (approximately 278%) more effective at FSAA than the GeForce 8500 GT, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 8500 GT		1800 Mpixels/sec
	Difference: 5000 (278%)

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 (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it should 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.