GeForce 9400 GT 256MB vs Radeon R7 240

Intro

Compare that to the Radeon R7 240, which features GPU core speed of 730 MHz, and 2048 MB of DDR3 RAM running at 900 MHz through a 128-bit bus. It also is made up of 320 SPUs, 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 9400 GT 256MB		50 Watts
	Difference: 20 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 240 should be 125% faster than the GeForce 9400 GT 256MB overall, because of its greater bandwidth. (explain)

Radeon R7 240		28800 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 16000 (125%)

Texel Rate

The Radeon R7 240 is a lot (approximately 232%) faster with regards to anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

Radeon R7 240		14600 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 10200 (232%)

Pixel Rate

The Radeon R7 240 is a lot (more or less 165%) more effective at FSAA than the GeForce 9400 GT 256MB, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon R7 240		5840 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 3640 (165%)

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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.