GeForce 820M vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which has GPU clock speed of 860 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is comprised of 1024 Stream Processors, 64 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 7850		5200 points
GeForce 820M		850 points
	Difference: 4350 (512%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 7850		130 Watts
	Difference: 115 Watts (767%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 should be 860% quicker than the GeForce 820M in general, due to its higher bandwidth. (explain)

Radeon HD 7850		153600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 137600 (860%)

Texel Rate

The Radeon HD 7850 will be quite a bit (more or less 378%) better at AF than the GeForce 820M. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 43536 (378%)

Pixel Rate

The Radeon HD 7850 will be quite a bit (approximately 857%) faster with regards to full screen anti-aliasing than the GeForce 820M, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 24644 (857%)

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 max amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.