GeForce 820M vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 Texture Address Units, 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

Radeon HD 7790		4330 points
GeForce 820M		850 points
	Difference: 3480 (409%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 7790		85 Watts
	Difference: 70 Watts (467%)

Memory Bandwidth

The Radeon HD 7790 should theoretically be a lot faster than the GeForce 820M overall. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 80000 (500%)

Texel Rate

The Radeon HD 7790 will be much (about 387%) faster with regards to texture filtering than the GeForce 820M. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 44496 (387%)

Pixel Rate

The Radeon HD 7790 is a lot (more or less 456%) faster with regards to FSAA than the GeForce 820M, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 13124 (456%)

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 moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.