GeForce 8400 GS 512MB vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which comes with core speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon R9 M280X		75 Watts
	Difference: 35 Watts (88%)

Memory Bandwidth

In theory, the Radeon R9 M280X should be a lot faster than the GeForce 8400 GS 512MB overall. (explain)

Radeon R9 M280X		88000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 81600 (1275%)

Texel Rate

The Radeon R9 M280X should be much (more or less 869%) faster with regards to texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R9 M280X		50400 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 45200 (869%)

Pixel Rate

The Radeon R9 M280X should be much (approximately 454%) faster with regards to anti-aliasing than the GeForce 8400 GS 512MB, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 11800 (454%)

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 information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount 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 number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.