Radeon R9 380 4G vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which makes use of a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM works at a frequency of 1375 MHz on this specific card. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon R9 380 4G		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G is 107% quicker than the Radeon R9 M280X overall, due to its greater bandwidth. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 94400 (107%)

Texel Rate

The Radeon R9 380 4G should be quite a bit (more or less 116%) better at AF than the Radeon R9 M280X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 58240 (116%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 380 4G is the winner, by a large margin. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 16640 (116%)

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 transferred over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.