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GeForce 825M vs GeForce 8600 GT 1GB DDR2

Intro

The GeForce 825M comes with a clock speed of 850 MHz and a DDR3 memory frequency of 900 MHz. It also features a 64-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 16 TAUs, and 8 ROPs.

Compare those specifications to the GeForce 8600 GT 1GB DDR2, which makes use of a 80 nm design. nVidia has clocked the core frequency at 540 MHz. The DDR2 RAM is set to run at a speed of 400 MHz on this particular model. It features 32 SPUs as well as 16 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce 8600 GT 1GB DDR2		47 Watts
	Difference: 14 Watts (42%)

Memory Bandwidth

Theoretically speaking, the GeForce 825M should perform a small bit faster than the GeForce 8600 GT 1GB DDR2 in general. (explain)

GeForce 825M		14400 MB/sec
GeForce 8600 GT 1GB DDR2		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 825M will be much (more or less 57%) better at texture filtering than the GeForce 8600 GT 1GB DDR2. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 8600 GT 1GB DDR2		8640 Mtexels/sec
	Difference: 4960 (57%)

Pixel Rate

The GeForce 825M should be a lot (more or less 57%) better at full screen anti-aliasing than the GeForce 8600 GT 1GB DDR2, and able to handle higher resolutions better. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 8600 GT 1GB DDR2		4320 Mpixels/sec
	Difference: 2480 (57%)

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

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GeForce 825M

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GeForce 8600 GT 1GB DDR2

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Specifications

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Model	GeForce 825M	GeForce 8600 GT 1GB DDR2
Manufacturer	nVidia	nVidia
Year	January 27 2014	April 2007
Code Name	GK208	G84
Memory	2048 MB	1024 MB
Core Speed	850 MHz	540 MHz
Memory Speed	1800 MHz	800 MHz
Power (Max TDP)	33 watts	47 watts
Bandwidth	14400 MB/sec	12800 MB/sec
Texel Rate	13600 Mtexels/sec	8640 Mtexels/sec
Pixel Rate	6800 Mpixels/sec	4320 Mpixels/sec
Unified Shaders	384	32
Texture Mapping Units	16	16
Render Output Units	8	8
Bus Type	DDR3	DDR2
Bus Width	64-bit	128-bit
Fab Process	28 nm	80 nm
Transistors	(Unknown) million	289 million
Bus	PCIe 3.0 x8	PCIe x16
DirectX Version	DirectX 12	DirectX 10
OpenGL Version	OpenGL 4.5	OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's bus 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 higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics 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 amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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