GeForce 820M vs GeForce GTX 970M

Intro

Compare all that to the GeForce GTX 970M, which features a clock speed of 924 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 192-bit bus, and uses a 28 nm design. It is comprised of 1280 SPUs, 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

Theoretically, the GeForce GTX 970M should perform quite a bit faster than 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 much (approximately 543%) more effective at texture filtering than the GeForce 820M. (explain)

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

Pixel Rate

The GeForce GTX 970M will be quite a bit (approximately 1442%) faster with regards to anti-aliasing than the GeForce 820M, and will be capable of handling higher resolutions without slowing down too much. (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 maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.