GeForce GT 340 vs GeForce GTX 870M

Intro

Compare those specifications to the GeForce GTX 870M, which has GPU clock speed of 941 MHz, and 3072 MB of GDDR5 RAM running at 1000 MHz through a 192-bit bus. It also is made up of 1344 SPUs, 112 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce GTX 870M		110 Watts
	Difference: 41 Watts (59%)

Memory Bandwidth

In theory, the GeForce GTX 870M will be 76% quicker than the GeForce GT 340 in general, because of its greater data rate. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 41600 (76%)

Texel Rate

The GeForce GTX 870M will be a lot (approximately 499%) better at anisotropic filtering than the GeForce GT 340. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 87792 (499%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is a better choice, by far. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 18184 (413%)

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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its 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 the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.