Radeon R9 380 4G vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which comes with GPU clock speed of 900 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R9 380 4G		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G is 153% quicker than the Radeon R9 M275X in general, due to its higher data rate. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 110400 (153%)

Texel Rate

The Radeon R9 380 4G should be quite a bit (more or less 202%) more effective at texture filtering than the Radeon R9 M275X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 72640 (202%)

Pixel Rate

The Radeon R9 380 4G will be much (about 116%) faster with regards to FSAA than the Radeon R9 M275X, and also capable of handling higher resolutions while still performing well. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M275X		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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.