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GeForce 825M vs Radeon R5 M255

Intro

The GeForce 825M uses a 28 nm design. nVidia has clocked the core speed at 850 MHz. The DDR3 memory works at a frequency of 900 MHz on this particular model. It features 384 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all of that 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 as well as 20 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R5 M255 will be 11% faster than the GeForce 825M in general, due to its higher bandwidth. (explain)

Radeon R5 M255 16000 MB/sec
GeForce 825M 14400 MB/sec
Difference: 1600 (11%)

Texel Rate

The Radeon R5 M255 is quite a bit (approximately 38%) more effective at texture filtering than the GeForce 825M. (explain)

Radeon R5 M255 18800 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 5200 (38%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R5 M255 is a better choice, though not by far. (explain)

Radeon R5 M255 7520 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 720 (11%)

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 825M

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 825M Radeon R5 M255
Manufacturer nVidia AMD
Year January 27 2014 June 2014
Code Name GK208 Jet Pro
Memory 2048 MB 2048 MB
Core Speed 850 MHz 940 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 33 watts (Unknown) watts
Bandwidth 14400 MB/sec 16000 MB/sec
Texel Rate 13600 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 384 320
Texture Mapping Units 16 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 x8 PCIe 3.0 x8
DirectX Version DirectX 12 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 825M

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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