GeForce 825M vs GeForce 8600 GT 512MB GDDR3

Intro

Compare those specifications to the GeForce 8600 GT 512MB GDDR3, which has GPU clock speed of 540 MHz, and 512 MB of GDDR3 RAM running at 700 MHz through a 128-bit bus. It also features 32 Stream Processors, 16 Texture Address Units, 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 512MB GDDR3		47 Watts
	Difference: 14 Watts (42%)

Memory Bandwidth

Performance-wise, the GeForce 8600 GT 512MB GDDR3 should in theory be quite a bit better than the GeForce 825M in general. (explain)

GeForce 8600 GT 512MB GDDR3		22400 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 8000 (56%)

Texel Rate

The GeForce 825M is quite a bit (approximately 57%) faster with regards to texture filtering than the GeForce 8600 GT 512MB GDDR3. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 8600 GT 512MB GDDR3		8640 Mtexels/sec
	Difference: 4960 (57%)

Pixel Rate

The GeForce 825M will be much (more or less 57%) faster with regards to full screen anti-aliasing than the GeForce 8600 GT 512MB GDDR3, and able to handle higher screen resolutions more effectively. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 8600 GT 512MB GDDR3		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: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, 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 figure is calculated by multiplying the total amount of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.