GeForce GTS 250 512MB vs GeForce GTX 880M

Intro

Compare that to the GeForce GTX 880M, which features a clock speed of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is made up of 1536 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
GeForce GTS 250 512MB		145 Watts
	Difference: 15 Watts (12%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should perform quite a bit faster than the GeForce GTS 250 512MB overall. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce GTS 250 512MB		70400 MB/sec
	Difference: 57600 (82%)

Texel Rate

The GeForce GTX 880M will be much (about 159%) faster with regards to texture filtering than the GeForce GTS 250 512MB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GTS 250 512MB		47232 Mtexels/sec
	Difference: 74880 (159%)

Pixel Rate

The GeForce GTX 880M will be much (approximately 159%) faster with regards to AA than the GeForce GTS 250 512MB, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GTS 250 512MB		11808 Mpixels/sec
	Difference: 18720 (159%)

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 (in units of MB per second) that can be transported over the external memory interface in one second. It 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 ANOTHER 2x. The higher 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.