GeForce GTX 980M vs Radeon R9 M265X

Intro

Compare those specs to the Radeon R9 M265X, which makes use of a 28 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this specific card. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 78% faster than the Radeon R9 M265X overall, due to its higher data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 980M should be much (about 333%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 76648 (333%)

Pixel Rate

The GeForce GTX 980M is quite a bit (more or less 622%) better at full screen anti-aliasing than the Radeon R9 M265X, and should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 57232 (622%)

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 data (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 reach the max fill rate.