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GeForce GTX 980 vs Radeon R5 M255

Intro

The GeForce GTX 980 features a GPU core clock speed of 1126 MHz, and the 4096 MB of GDDR5 RAM is set to run at 1750 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 64 Raster Operation Units.

Compare those specs to the Radeon R5 M255, which has a core clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit memory bus, and uses a 28 nm design. It features 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 980 should in theory perform a lot faster than the Radeon R5 M255 in general. (explain)

GeForce GTX 980 224000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 980 is a lot (approximately 667%) more effective at AF than the Radeon R5 M255. (explain)

GeForce GTX 980 144128 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 125328 (667%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 980 is the winner, by a large margin. (explain)

GeForce GTX 980 72064 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 64544 (858%)

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 GTX 980

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 GTX 980 Radeon R5 M255
Manufacturer nVidia AMD
Year September 2014 June 2014
Code Name GM204-400 Jet Pro
Memory 4096 MB 2048 MB
Core Speed 1126 MHz 940 MHz
Memory Speed 7000 MHz 2000 MHz
Power (Max TDP) 165 watts (Unknown) watts
Bandwidth 224000 MB/sec 16000 MB/sec
Texel Rate 144128 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 72064 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 2048 320
Texture Mapping Units 128 20
Render Output Units 64 8
Bus Type GDDR5 DDR3
Bus Width 256-bit 64-bit
Fab Process 28 nm 28 nm
Transistors 5200 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x8
DirectX Version DirectX 11.2 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, 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 most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many 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 GTX 980

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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