GeForce 820M vs GeForce GTX 970M

Intro

Compare those specifications to the GeForce GTX 970M, which uses a 28 nm design. nVidia has set the core frequency at 924 MHz. The GDDR5 memory runs at a speed of 1000 MHz on this particular model. It features 1280 SPUs as well as 80 TAUs and 48 ROPs.

Display Graphs

Hide Graphs

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 970M		7520 points
GeForce 820M		850 points
	Difference: 6670 (785%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 970M		75 Watts
	Difference: 60 Watts (400%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 970M should theoretically be a lot superior to the GeForce 820M overall. (explain)

GeForce GTX 970M		96000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 80000 (500%)

Texel Rate

The GeForce GTX 970M will be quite a bit (more or less 543%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 970M		73920 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 62416 (543%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 970M is superior to the GeForce 820M, and very much so. (explain)

GeForce GTX 970M		44352 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 41476 (1442%)

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 largest amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.