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GeForce 840M vs Radeon R5 M255

Intro

The GeForce 840M makes use of a 28 nm design. nVidia has clocked the core frequency at 1029 MHz. The DDR3 memory runs at a frequency of 1000 MHz on this model. It features 384 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the Radeon R5 M255, which features core clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs along with 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The GeForce 840M should be much (approximately 31%) faster with regards to AF than the Radeon R5 M255. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the GeForce 840M is superior to the Radeon R5 M255, though only just barely. (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 information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are 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 better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount 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 rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max 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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