Radeon R7 250 vs Radeon R9 M280X

Intro

Compare all that to the Radeon R9 M280X, which has GPU clock speed of 900 MHz, and 4096 MB of GDDR5 memory running at 1375 MHz through a 128-bit bus. It also features 896 Stream Processors, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon R9 M280X		75 Watts
	Difference: 10 Watts (15%)

Memory Bandwidth

In theory, the Radeon R9 M280X will be 20% faster than the Radeon R7 250 overall, because of its greater data rate. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 14400 (20%)

Texel Rate

The Radeon R9 M280X should be much (about 110%) more effective at texture filtering than the Radeon R7 250. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 26400 (110%)

Pixel Rate

The Radeon R9 M280X is a lot (more or less 80%) more effective at AA than the Radeon R7 250, and should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 6400 (80%)

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 data (measured in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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