GeForce GTX 660 vs Radeon R9 M380

Intro

Compare those specs to the Radeon R9 M380, which features clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should theoretically be much better than the Radeon R9 M380 overall. (explain)

GeForce GTX 660		144192 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 48192 (50%)

Texel Rate

The GeForce GTX 660 should be a lot (more or less 96%) more effective at texture filtering than the Radeon R9 M380. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 38400 (96%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 660 is superior to the Radeon R9 M380, by a large margin. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 7520 (47%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure 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 filling the screen with pixels (the image). The actual pixel rate also depends on quite a few 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.