GeForce 820M vs GeForce GTX 750

Intro

Compare those specs to the GeForce GTX 750, which features GPU clock speed of 1020 MHz, and 1024 MB of GDDR5 memory running at 1250 MHz through a 128-bit bus. It also is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

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 in theory be quite a bit better than 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 will be 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 is a lot (about 467%) more effective at anti-aliasing than the GeForce 820M, and will be able to handle higher screen resolutions without losing too much performance. (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 information (measured in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.