GeForce 820M vs GeForce GTX 980M

Intro

Compare those specifications to the GeForce GTX 980M, which features a core clock frequency of 1038 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It features 1536 SPUs, 96 TAUs, and 64 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 980M		9476 points
GeForce 820M		850 points
	Difference: 8626 (1015%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 980M		100 Watts
	Difference: 85 Watts (567%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 700% quicker than the GeForce 820M overall, due to its greater bandwidth. (explain)

GeForce GTX 980M		128000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The GeForce GTX 980M is quite a bit (about 766%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce GTX 980M		99648 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 88144 (766%)

Pixel Rate

The GeForce GTX 980M will be quite a bit (about 2210%) faster with regards to FSAA than the GeForce 820M, and should be capable of handling higher screen resolutions better. (explain)

GeForce GTX 980M		66432 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 63556 (2210%)

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 (measured in MB per second) that can be transported over the external memory interface in one second. It's worked out 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 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, 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 graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.