GeForce 9400 GT 256MB vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with GPU clock speed of 750 MHz, and 4096 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon R9 M295X		125 Watts
	Difference: 75 Watts (150%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M295X should theoretically be a lot better than the GeForce 9400 GT 256MB overall. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 163200 (1275%)

Texel Rate

The Radeon R9 M295X is quite a bit (about 2082%) more effective at AF than the GeForce 9400 GT 256MB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 91600 (2082%)

Pixel Rate

The Radeon R9 M295X is much (more or less 991%) better at FSAA than the GeForce 9400 GT 256MB, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 21800 (991%)

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 maximum amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 are processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per 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. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock 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 output rate is also dependant 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 max fill rate.