GeForce 825M vs GeForce 8500 GT

Intro

Compare those specifications to the GeForce 8500 GT, which has a clock speed of 450 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 128-bit memory bus, and uses a 80 nm design. It is made up of 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

Performance-wise, the GeForce 825M should theoretically be a small bit superior to the GeForce 8500 GT in general. (explain)

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

Texel Rate

The GeForce 825M will be quite a bit (approximately 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 quite a bit (more or less 278%) more effective at full screen anti-aliasing than the GeForce 8500 GT, and also able to handle higher screen resolutions more effectively. (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 largest amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.