GeForce 8400 GS 512MB vs Radeon R7 250

Intro

Compare those specifications to the Radeon R7 250, which has a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1150 MHz through a 128-bit bus. It also is made up of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon R7 250		65 Watts
	Difference: 25 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 should be 1050% quicker than the GeForce 8400 GS 512MB overall, due to its greater data rate. (explain)

Radeon R7 250		73600 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 67200 (1050%)

Texel Rate

The Radeon R7 250 should be quite a bit (about 362%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

Radeon R7 250		24000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 18800 (362%)

Pixel Rate

The Radeon R7 250 should be much (approximately 208%) better at full screen anti-aliasing than the GeForce 8400 GS 512MB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R7 250		8000 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 5400 (208%)

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 (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be processed per second. This 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.