GeForce 825M vs GeForce GTX 970M

Intro

Compare those specs to the GeForce GTX 970M, which comes with a clock speed of 924 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 192-bit bus, and makes use of a 28 nm design. It features 1280 SPUs, 80 TAUs, and 48 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 970M		75 Watts
	Difference: 42 Watts (127%)

Memory Bandwidth

In theory, the GeForce GTX 970M is 567% faster than the GeForce 825M overall, due to its greater bandwidth. (explain)

GeForce GTX 970M		96000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 81600 (567%)

Texel Rate

The GeForce GTX 970M will be much (about 444%) more effective at AF than the GeForce 825M. (explain)

GeForce GTX 970M		73920 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 60320 (444%)

Pixel Rate

The GeForce GTX 970M will be a lot (approximately 552%) more effective at full screen anti-aliasing than the GeForce 825M, and also capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 970M		44352 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 37552 (552%)

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 megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If 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 can be applied per 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 this number, the better the graphics 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 most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.