GeForce GTX 880M vs Radeon R9 M265X

Intro

Compare that to the Radeon R9 M265X, which comes with core clock speeds of 575 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 880M should perform much faster than the Radeon R9 M265X in general. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 880M will be quite a bit (more or less 431%) more effective at anisotropic filtering than the Radeon R9 M265X. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 99112 (431%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 880M is the winner, and very much so. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 21328 (232%)

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 (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.