GeForce 820M vs GeForce GTX 980M

Intro

Compare that to the GeForce GTX 980M, which comes with a core clock speed of 1038 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit bus, and makes use of 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

Performance-wise, the GeForce GTX 980M should in theory be a lot better than the GeForce 820M in general. (explain)

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

Texel Rate

The GeForce GTX 980M will be a lot (about 766%) faster with regards to 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 a lot (about 2210%) more effective at anti-aliasing than the GeForce 820M, and should be able to handle higher resolutions more effectively. (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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.