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GeForce 840M vs Radeon R5 M255

Intro

The GeForce 840M features a core clock speed of 1029 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It features 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Compare that to the Radeon R5 M255, which comes with clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should perform the same. (explain)

Texel Rate

The GeForce 840M will be much (approximately 31%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce 840M 24696 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 5896 (31%)

Pixel Rate

The GeForce 840M will be just a bit (approximately 9%) more effective at anti-aliasing than the Radeon R5 M255, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce 840M 8232 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 712 (9%)

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

Check prices at:

Radeon R5 M255

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 840M Radeon R5 M255
Manufacturer nVidia AMD
Year March 12 2014 June 2014
Code Name GM108 Jet Pro
Memory 2048 MB 2048 MB
Core Speed 1029 MHz 940 MHz
Memory Speed 2000 MHz 2000 MHz
Power (Max TDP) 30 watts (Unknown) watts
Bandwidth 16000 MB/sec 16000 MB/sec
Texel Rate 24696 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 384 320
Texture Mapping Units 24 20
Render Output Units 8 8
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x8
DirectX Version DirectX 12 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 840M

Amazon.com

Check prices at:

Radeon R5 M255

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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