GeForce 820M vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which has a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 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 390X 8G		13555 points
GeForce 820M		850 points
	Difference: 12705 (1495%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 260 Watts (1733%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G will be 2300% quicker than the GeForce 820M overall, because of its greater data rate. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 368000 (2300%)

Texel Rate

The Radeon R9 390X 8G is a lot (more or less 1506%) better at AF than the GeForce 820M. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 173296 (1506%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 390X 8G is a better choice, by far. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 64324 (2237%)

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 maximum amount of data (measured in MB per second) that can be transported 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 the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core 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 many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.