GeForce 830M vs Geforce GTX 680

Intro

Compare all of that to the Geforce GTX 680, which makes use of a 28 nm design. nVidia has clocked the core frequency at 1006 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this particular card. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Geforce GTX 680		195 Watts
	Difference: 170 Watts (680%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should theoretically be quite a bit superior to the GeForce 830M overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 177856 (1235%)

Texel Rate

The Geforce GTX 680 will be much (approximately 682%) better at anisotropic filtering than the GeForce 830M. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 112304 (682%)

Pixel Rate

If using a high screen resolution is important to you, then the Geforce GTX 680 is superior to the GeForce 830M, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 23960 (291%)

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 MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 in one second. This number 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few 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.