GeForce 8400 GS 512MB vs Radeon R9 M295X

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon R9 M295X		125 Watts
	Difference: 85 Watts (213%)

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should theoretically be a lot better than the GeForce 8400 GS 512MB overall. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 169600 (2650%)

Texel Rate

The Radeon R9 M295X will be quite a bit (about 1746%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 90800 (1746%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 M295X is the winner, by far. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 21400 (823%)

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 (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.