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GeForce 840M vs Radeon R9 Nano

Intro

The GeForce 840M has a GPU core speed of 1029 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also is made up of 384 Stream Processors, 24 TAUs, and 8 Raster Operation Units.

Compare all that to the Radeon R9 Nano, which has a core clock speed of 1000 MHz and a HBM memory speed of 500 MHz. It also makes use of a 4096-bit memory bus, and makes use of a 28 nm design. It features 4096 SPUs, 256 Texture Address Units, and 64 Raster Operation Units.

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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 Nano 14918 points
GeForce 840M 1600 points
Difference: 13318 (832%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
Radeon R9 Nano 175 Watts
Difference: 145 Watts (483%)

Memory Bandwidth

Performance-wise, the Radeon R9 Nano should in theory be quite a bit superior to the GeForce 840M in general. (explain)

Radeon R9 Nano 512000 MB/sec
GeForce 840M 16000 MB/sec
Difference: 496000 (3100%)

Texel Rate

The Radeon R9 Nano is quite a bit (about 937%) more effective at texture filtering than the GeForce 840M. (explain)

Radeon R9 Nano 256000 Mtexels/sec
GeForce 840M 24696 Mtexels/sec
Difference: 231304 (937%)

Pixel Rate

The Radeon R9 Nano is a lot (approximately 677%) more effective at full screen anti-aliasing than the GeForce 840M, and will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 Nano 64000 Mpixels/sec
GeForce 840M 8232 Mpixels/sec
Difference: 55768 (677%)

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 840M

Amazon.com

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Radeon R9 Nano

Amazon.com

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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 840M Radeon R9 Nano
Manufacturer nVidia AMD
Year March 12 2014 September 2015
Code Name GM108 Fiji XT
Memory 2048 MB 4096 MB
Core Speed 1029 MHz 1000 MHz
Memory Speed 2000 MHz 500 MHz
Power (Max TDP) 30 watts 175 watts
Bandwidth 16000 MB/sec 512000 MB/sec
Texel Rate 24696 Mtexels/sec 256000 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 384 4096
Texture Mapping Units 24 256
Render Output Units 8 64
Bus Type DDR3 HBM
Bus Width 64-bit 4096-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 8900 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12.0
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 840M

Amazon.com

Check prices at:

Radeon R9 Nano

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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