GeForce 825M vs GeForce 8600 GT 256MB DDR2

Intro

Compare those specifications to the GeForce 8600 GT 256MB DDR2, which has GPU core speed of 540 MHz, and 256 MB of DDR2 memory set to run at 400 MHz through a 128-bit bus. It also is made up of 32 Stream Processors, 16 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce 8600 GT 256MB DDR2		47 Watts
	Difference: 14 Watts (42%)

Memory Bandwidth

Theoretically speaking, the GeForce 825M should be a small bit faster than the GeForce 8600 GT 256MB DDR2 overall. (explain)

GeForce 825M		14400 MB/sec
GeForce 8600 GT 256MB DDR2		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 825M will be a lot (more or less 57%) better at texture filtering than the GeForce 8600 GT 256MB DDR2. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 8600 GT 256MB DDR2		8640 Mtexels/sec
	Difference: 4960 (57%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 825M is superior to the GeForce 8600 GT 256MB DDR2, by far. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 8600 GT 256MB DDR2		4320 Mpixels/sec
	Difference: 2480 (57%)

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 (in units of MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it 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 in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.