GeForce 8400 GS 512MB vs Radeon R7 250X 2GB

Intro

Compare all of that to the Radeon R7 250X 2GB, which comes with clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 55 Watts (138%)

Memory Bandwidth

The Radeon R7 250X 2GB, in theory, should perform quite a bit faster than the GeForce 8400 GS 512MB in general. (explain)

Radeon R7 250X 2GB		72000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 65600 (1025%)

Texel Rate

The Radeon R7 250X 2GB is a lot (approximately 669%) better at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 34800 (669%)

Pixel Rate

The Radeon R7 250X 2GB will be much (more or less 515%) faster with regards to anti-aliasing than the GeForce 8400 GS 512MB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 13400 (515%)

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 (counted in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied 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 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 maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.