GeForce 825M vs GeForce 8800 GT 512MB

Intro

Compare all that to the GeForce 8800 GT 512MB, which has a clock speed of 600 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 256-bit memory bus, and uses a 65 nm design. It features 112 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 72 Watts (218%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GT 512MB should theoretically be much better than the GeForce 825M in general. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 43200 (300%)

Texel Rate

The GeForce 8800 GT 512MB should be quite a bit (more or less 147%) better at anisotropic filtering than the GeForce 825M. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 20000 (147%)

Pixel Rate

The GeForce 8800 GT 512MB will be a lot (about 41%) faster with regards to anti-aliasing than the GeForce 825M, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 8800 GT 512MB		9600 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 2800 (41%)

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 information (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, 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, 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 calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.