GeForce 820M vs Radeon HD 7950

Intro

Compare those specifications to the Radeon HD 7950, which comes with a GPU core clock speed of 800 MHz, and 1536 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 112 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 7950		7731 points
GeForce 820M		850 points
	Difference: 6881 (810%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 7950		200 Watts
	Difference: 185 Watts (1233%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 is 1400% quicker than the GeForce 820M in general, because of its greater bandwidth. (explain)

Radeon HD 7950		240000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 224000 (1400%)

Texel Rate

The Radeon HD 7950 is a lot (more or less 679%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 78096 (679%)

Pixel Rate

The Radeon HD 7950 is a lot (more or less 790%) faster with regards to FSAA than the GeForce 820M, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 22724 (790%)

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 (counted in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.