GeForce 825M vs GeForce 9500 GT 1GB GDDR3

Intro

Compare those specifications to the GeForce 9500 GT 1GB GDDR3, which uses a 55 nm design. nVidia has set the core speed at 550 MHz. The GDDR3 RAM is set to run at a speed of 800 MHz on this specific card. It features 32 SPUs as well as 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 9500 GT 1GB GDDR3		50 Watts
	Difference: 17 Watts (52%)

Memory Bandwidth

Theoretically speaking, the GeForce 9500 GT 1GB GDDR3 should be 78% faster than the GeForce 825M overall, because of its higher bandwidth. (explain)

GeForce 9500 GT 1GB GDDR3		25600 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 11200 (78%)

Texel Rate

The GeForce 825M should be much (more or less 55%) faster with regards to texture filtering than the GeForce 9500 GT 1GB GDDR3. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 9500 GT 1GB GDDR3		8800 Mtexels/sec
	Difference: 4800 (55%)

Pixel Rate

The GeForce 825M will be a lot (approximately 55%) faster with regards to anti-aliasing than the GeForce 9500 GT 1GB GDDR3, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 9500 GT 1GB GDDR3		4400 Mpixels/sec
	Difference: 2400 (55%)

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 (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.