GeForce 8400 GS 512MB vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which comes with a core clock frequency of 725 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M270X should in theory be much faster than the GeForce 8400 GS 512MB in general. (explain)

Radeon R9 M270X		72000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 65600 (1025%)

Texel Rate

The Radeon R9 M270X should be quite a bit (more or less 458%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R9 M270X		29000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 23800 (458%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M270X is superior to the GeForce 8400 GS 512MB, and very much so. (explain)

Radeon R9 M270X		11600 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 9000 (346%)

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

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.