Geforce GTX 680 vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which has a core clock speed of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Geforce GTX 680 will be 167% quicker than the Radeon R9 M265X overall, due to its higher data rate. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 120256 (167%)

Texel Rate

The Geforce GTX 680 should be much (about 460%) faster with regards to texture filtering than the Radeon R9 M265X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 105768 (460%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 680 is superior to the Radeon R9 M265X, by a large margin. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 22992 (250%)

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 information (in units of MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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