GeForce 8800 GTS (G80) 640MB vs GeForce GTX 870M

Intro

Compare that to the GeForce GTX 870M, which uses a 28 nm design. nVidia has clocked the core speed at 941 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this specific card. It features 1344 SPUs as well as 112 TAUs and 24 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 33 Watts (30%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 870M will be 52% faster than the GeForce 8800 GTS (G80) 640MB overall, due to its higher data rate. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 32640 (52%)

Texel Rate

The GeForce GTX 870M should be quite a bit (more or less 328%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 80768 (328%)

Pixel Rate

The GeForce GTX 870M is quite a bit (approximately 120%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 12324 (120%)

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 maximum amount of data (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's interface 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 memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.