GeForce 820M vs Radeon R9 290

Intro

Compare all of that to the Radeon R9 290, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 512-bit memory bus, and makes use of a 28 nm design. It is made up of 2560 SPUs, 160 TAUs, and 64 ROPs.

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 R9 290		9876 points
GeForce 820M		850 points
	Difference: 9026 (1062%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 290		300 Watts
	Difference: 285 Watts (1900%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 290 should be 1900% faster than the GeForce 820M in general, due to its higher data rate. (explain)

Radeon R9 290		320000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 304000 (1900%)

Texel Rate

The Radeon R9 290 is quite a bit (more or less 1013%) better at texture filtering than the GeForce 820M. (explain)

Radeon R9 290		128000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 116496 (1013%)

Pixel Rate

The Radeon R9 290 is much (about 1680%) faster with regards to FSAA than the GeForce 820M, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 290		51200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 48324 (1680%)

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 MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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