GeForce 825M vs GeForce 8500 GT

Intro

Compare all of that to the GeForce 8500 GT, which comes with a clock speed of 450 MHz and a DDR2 memory frequency of 400 MHz. It also uses a 128-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce 825M, in theory, should be a little bit faster than the GeForce 8500 GT overall. (explain)

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

Texel Rate

The GeForce 825M should be quite a bit (more or less 278%) faster with regards to anisotropic 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 will be a lot (approximately 278%) better at AA than the GeForce 8500 GT, and also should be capable of handling higher screen 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: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.