GeForce 820M vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which uses a 28 nm design. nVidia has clocked the core speed at 863 MHz. The GDDR5 RAM is set to run at a speed of 1502 MHz on this model. It features 2304 SPUs along with 192 TAUs and 48 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 780		10082 points
GeForce 820M		850 points
	Difference: 9232 (1086%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Geforce GTX 780		250 Watts
	Difference: 235 Watts (1567%)

Memory Bandwidth

The Geforce GTX 780 should in theory be quite a bit faster than the GeForce 820M overall. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 272384 (1702%)

Texel Rate

The Geforce GTX 780 will be quite a bit (approximately 1340%) faster with regards to texture filtering than the GeForce 820M. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 154192 (1340%)

Pixel Rate

The Geforce GTX 780 is a lot (approximately 1340%) better at FSAA than the GeForce 820M, and also should be capable of handling higher screen resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 38548 (1340%)

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.