GeForce GTX 660 vs Radeon R9 M380

Intro

Compare those specifications to the Radeon R9 M380, which features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should perform a lot faster 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 is quite a bit (about 96%) faster with regards to 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

The GeForce GTX 660 should be much (approximately 47%) faster with regards to anti-aliasing than the Radeon R9 M380, and also should be capable of handling higher resolutions better. (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: Bandwidth is the largest amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 potential to reach the max fill rate.