GeForce 8400 GS 512MB vs Radeon R7 240

Intro

Compare that to the Radeon R7 240, which uses a 28 nm design. AMD has set the core frequency at 730 MHz. The DDR3 RAM runs at a speed of 900 MHz on this card. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
GeForce 8400 GS 512MB		40 Watts
	Difference: 10 Watts (33%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 240 will be 350% faster than the GeForce 8400 GS 512MB overall, because of its greater bandwidth. (explain)

Radeon R7 240		28800 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 22400 (350%)

Texel Rate

The Radeon R7 240 should be a lot (more or less 181%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R7 240		14600 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 9400 (181%)

Pixel Rate

The Radeon R7 240 should be a lot (approximately 125%) better at AA than the GeForce 8400 GS 512MB, and able to handle higher screen resolutions more effectively. (explain)

Radeon R7 240		5840 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 3240 (125%)

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: Memory bandwidth is the max amount of information (measured 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 interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 processed per second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.