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GeForce 820M vs Radeon R9 M385X

Intro

The GeForce 820M comes with a GPU core clock speed of 719 MHz, and the 2048 MB of DDR3 RAM is set to run at 1000 MHz through a 64-bit bus. It also features 96 SPUs, 16 Texture Address Units, and 4 ROPs.

Compare those specifications to the Radeon R9 M385X, which uses a 28 nm design. AMD has set the core speed at 1100 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this particular model. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X should perform a lot faster than the GeForce 820M overall. (explain)

Radeon R9 M385X 96000 MB/sec
GeForce 820M 16000 MB/sec
Difference: 80000 (500%)

Texel Rate

The Radeon R9 M385X is much (approximately 435%) more effective at AF than the GeForce 820M. (explain)

Radeon R9 M385X 61600 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 50096 (435%)

Pixel Rate

The Radeon R9 M385X will be much (more or less 512%) better at FSAA than the GeForce 820M, and also able to handle higher resolutions more effectively. (explain)

Radeon R9 M385X 17600 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 14724 (512%)

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

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GeForce 820M

Amazon.com

Check prices at:

Radeon R9 M385X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 820M Radeon R9 M385X
Manufacturer nVidia AMD
Year February 2014 2015
Code Name GF117 Bonaire
Memory 2048 MB 4096 MB
Core Speed 719 MHz 1100 MHz
Memory Speed 2000 MHz 6000 MHz
Power (Max TDP) 15 watts (Unknown) watts
Bandwidth 16000 MB/sec 96000 MB/sec
Texel Rate 11504 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 96 896
Texture Mapping Units 16 56
Render Output Units 4 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce 820M

Amazon.com

Check prices at:

Radeon R9 M385X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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