GeForce 820M vs Radeon HD 7870

Intro

Compare all of that to the Radeon HD 7870, which comes with GPU core speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 TAUs, and 32 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

Radeon HD 7870		6230 points
GeForce 820M		850 points
	Difference: 5380 (633%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 7870		175 Watts
	Difference: 160 Watts (1067%)

Memory Bandwidth

The Radeon HD 7870 should theoretically perform a lot faster than the GeForce 820M in general. (explain)

Radeon HD 7870		153600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 137600 (860%)

Texel Rate

The Radeon HD 7870 is quite a bit (more or less 595%) better at texture filtering than the GeForce 820M. (explain)

Radeon HD 7870		80000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 68496 (595%)

Pixel Rate

The Radeon HD 7870 will be much (more or less 1013%) more effective at full screen anti-aliasing than the GeForce 820M, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7870		32000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 29124 (1013%)

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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.