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GeForce 9400 GT 256MB vs Radeon R5 M255

Intro

The GeForce 9400 GT 256MB comes with a GPU core clock speed of 550 MHz, and the 256 MB of GDDR2 memory is set to run at 400 MHz through a 128-bit bus. It also is comprised of 16 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare those specs to the Radeon R5 M255, which makes use of a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 RAM is set to run at a frequency of 1000 MHz on this specific model. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R5 M255 is 25% faster than the GeForce 9400 GT 256MB overall, because of its higher data rate. (explain)

Radeon R5 M255 16000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The Radeon R5 M255 is quite a bit (more or less 327%) better at texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon R5 M255 18800 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 14400 (327%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R5 M255 is the winner, and very much so. (explain)

Radeon R5 M255 7520 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 5320 (242%)

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 9400 GT 256MB

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 9400 GT 256MB Radeon R5 M255
Manufacturer nVidia AMD
Year August 2008 June 2014
Code Name G96a Jet Pro
Memory 256 MB 2048 MB
Core Speed 550 MHz 940 MHz
Memory Speed 800 MHz 2000 MHz
Power (Max TDP) 50 watts (Unknown) watts
Bandwidth 12800 MB/sec 16000 MB/sec
Texel Rate 4400 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 16 320
Texture Mapping Units 8 20
Render Output Units 4 8
Bus Type GDDR2 DDR3
Bus Width 128-bit 64-bit
Fab Process 65 nm 28 nm
Transistors 314 million (Unknown) million
Bus PCIe x16 2.0, PCI PCIe 3.0 x8
DirectX Version DirectX 10 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock 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 number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 9400 GT 256MB

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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