GeForce 9400 GT 256MB vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which features clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon R9 M275X should theoretically be a lot better than the GeForce 9400 GT 256MB overall. (explain)

Radeon R9 M275X		72000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon R9 M275X will be quite a bit (about 718%) better at AF than the GeForce 9400 GT 256MB. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 31600 (718%)

Pixel Rate

The Radeon R9 M275X will be quite a bit (about 555%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and also able to handle higher screen resolutions better. (explain)

Radeon R9 M275X		14400 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 12200 (555%)

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 MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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