GeForce 825M vs GeForce GTX 965M

Intro

Compare those specifications to the GeForce GTX 965M, which features a GPU core clock speed of 944 MHz, and 2048 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also features 1024 Stream Processors, 64 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 965M		60 Watts
	Difference: 27 Watts (82%)

Memory Bandwidth

In theory, the GeForce GTX 965M should be quite a bit faster than the GeForce 825M overall. (explain)

GeForce GTX 965M		64000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 49600 (344%)

Texel Rate

The GeForce GTX 965M should be a lot (approximately 344%) better at AF than the GeForce 825M. (explain)

GeForce GTX 965M		60416 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 46816 (344%)

Pixel Rate

The GeForce GTX 965M is a lot (about 344%) more effective at anti-aliasing than the GeForce 825M, and should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 965M		30208 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 23408 (344%)

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 transferred over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the 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 number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.