GeForce 820M vs GeForce GTX 750

Intro

Compare all of that to the GeForce GTX 750, which makes use of a 28 nm design. nVidia has set the core speed at 1020 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this model. It features 512 SPUs as well as 32 TAUs and 16 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 750		3958 points
GeForce 820M		850 points
	Difference: 3108 (366%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 750		55 Watts
	Difference: 40 Watts (267%)

Memory Bandwidth

Performance-wise, the GeForce GTX 750 should theoretically be much superior to the GeForce 820M overall. (explain)

GeForce GTX 750		80000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 64000 (400%)

Texel Rate

The GeForce GTX 750 is a lot (about 184%) better at AF than the GeForce 820M. (explain)

GeForce GTX 750		32640 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 21136 (184%)

Pixel Rate

The GeForce GTX 750 should be a lot (more or less 467%) more effective at AA than the GeForce 820M, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 750		16320 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 13444 (467%)

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 data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.