GeForce 820M vs Radeon R9 290X

Intro

Compare those specs to the Radeon R9 290X, which features GPU core speed of 800 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 Texture Address Units, 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 290X		10609 points
GeForce 820M		850 points
	Difference: 9759 (1148%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon R9 290X will be 1900% faster than the GeForce 820M in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon R9 290X should be quite a bit (about 1124%) better at texture filtering than the GeForce 820M. (explain)

Radeon R9 290X		140800 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 129296 (1124%)

Pixel Rate

The Radeon R9 290X is quite a bit (more or less 1680%) more effective at AA than the GeForce 820M, and will be capable of handling higher resolutions better. (explain)

Radeon R9 290X		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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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