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GeForce 8800 GTS (G80) 640MB vs GeForce GTX 960M

Intro

The GeForce 8800 GTS (G80) 640MB features core speeds of 513 MHz on the GPU, and 792 MHz on the 640 MB of GDDR3 RAM. It features 96 SPUs along with 48 TAUs and 20 ROPs.

Compare those specifications to the GeForce GTX 960M, which features GPU core speed of 1096 MHz, and 2048 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 960M		65 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 78 Watts (120%)

Memory Bandwidth

The GeForce GTX 960M, in theory, should perform just a bit faster than the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 960M		64000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 640 (1%)

Texel Rate

The GeForce GTX 960M is a lot (more or less 78%) better at anisotropic filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 960M		43840 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 19216 (78%)

Pixel Rate

The GeForce GTX 960M will be a lot (approximately 71%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 960M		17536 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 7276 (71%)

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 8800 GTS (G80) 640MB

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Specifications

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Model	GeForce 8800 GTS (G80) 640MB	GeForce GTX 960M
Manufacturer	nVidia	nVidia
Year	Nov 2006 (640)	March 12 2015
Code Name	G80	GM107
Memory	640 MB	2048 MB
Core Speed	513 MHz	1096 MHz
Memory Speed	1584 MHz	4000 MHz
Power (Max TDP)	143 watts	65 watts
Bandwidth	63360 MB/sec	64000 MB/sec
Texel Rate	24624 Mtexels/sec	43840 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	17536 Mpixels/sec
Unified Shaders	96	640
Texture Mapping Units	48	40
Render Output Units	20	16
Bus Type	GDDR3	GDDR5
Bus Width	320-bit	128-bit
Fab Process	90 nm	28 nm
Transistors	681 million	(Unknown) million
Bus	PCIe x16	PCIe 3.0 x16
DirectX Version	DirectX 10	DirectX 12
OpenGL Version	OpenGL 3.0	OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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