GeForce 820M vs Geforce GTX 690

Intro

Compare those specifications to the Geforce GTX 690, which comes with clock speeds of 915 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 128 Texture Address Units and 32 ROPs.

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 690		13111 points
GeForce 820M		850 points
	Difference: 12261 (1442%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Geforce GTX 690		300 Watts
	Difference: 285 Watts (1900%)

Memory Bandwidth

In theory, the Geforce GTX 690 should be 2303% quicker than the GeForce 820M in general, due to its higher data rate. (explain)

Geforce GTX 690		384512 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 368512 (2303%)

Texel Rate

The Geforce GTX 690 is quite a bit (approximately 1936%) more effective at anisotropic filtering than the GeForce 820M. (explain)

Geforce GTX 690		234240 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 222736 (1936%)

Pixel Rate

The Geforce GTX 690 will be quite a bit (more or less 1936%) more effective at full screen anti-aliasing than the GeForce 820M, and also should be capable of handling higher resolutions without losing too much performance. (explain)

Geforce GTX 690		58560 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 55684 (1936%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the 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 most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.