GeForce GT 340 vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which comes with GPU core speed of 876 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 340		69 Watts
	Difference: 29 Watts (73%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 340 should be 70% quicker than the GeForce GTX 850M overall, due to its higher data rate. (explain)

GeForce GT 340		54400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 22400 (70%)

Texel Rate

The GeForce GTX 850M is a lot (approximately 99%) more effective at anisotropic filtering than the GeForce GT 340. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 17440 (99%)

Pixel Rate

The GeForce GTX 850M will be a lot (about 219%) faster with regards to anti-aliasing than the GeForce GT 340, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 9616 (219%)

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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.