GeForce GTX 980 vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which features a core clock speed of 1100 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 980 should in theory be a lot faster than the Radeon R9 M385X overall. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 128000 (133%)

Texel Rate

The GeForce GTX 980 is a lot (more or less 134%) faster with regards to anisotropic filtering than the Radeon R9 M385X. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 82528 (134%)

Pixel Rate

The GeForce GTX 980 will be a lot (about 309%) better at FSAA than the Radeon R9 M385X, and should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 54464 (309%)

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 max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.