GeForce GTX 980M vs Radeon R9 M270X

Intro

Compare those specs to the Radeon R9 M270X, which features GPU core speed of 725 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 980M should theoretically perform much faster than the Radeon R9 M270X overall. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 980M should be much (more or less 244%) faster with regards to AF than the Radeon R9 M270X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 70648 (244%)

Pixel Rate

The GeForce GTX 980M is much (approximately 473%) more effective at full screen anti-aliasing than the Radeon R9 M270X, and capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 54832 (473%)

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 maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.