GeForce GT 640 DDR3 vs GeForce GTX 880M

Intro

Compare all of that to the GeForce GTX 880M, which comes with core clock speeds of 954 MHz on the GPU, and 1000 MHz on the 4096 MB of GDDR5 memory. It features 1536 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 880M		6360 points
GeForce GT 640 DDR3		1560 points
	Difference: 4800 (308%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 880M		130 Watts
	Difference: 65 Watts (100%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should perform much faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 70976 (124%)

Texel Rate

The GeForce GTX 880M should be quite a bit (more or less 324%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 93312 (324%)

Pixel Rate

The GeForce GTX 880M is quite a bit (more or less 112%) better at FSAA than the GeForce GT 640 DDR3, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 16128 (112%)

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 (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics 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 a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.