Geforce GTX 680 vs Radeon R9 M270X

Intro

Compare those specs to the Radeon R9 M270X, which features a clock frequency of 725 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

The Geforce GTX 680, in theory, should perform a lot faster than the Radeon R9 M270X overall. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 120256 (167%)

Texel Rate

The Geforce GTX 680 is much (about 344%) better at anisotropic filtering than the Radeon R9 M270X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 99768 (344%)

Pixel Rate

The Geforce GTX 680 will be much (more or less 178%) better at full screen anti-aliasing than the Radeon R9 M270X, and able to handle higher resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 20592 (178%)

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 (counted in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core 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 in a second.

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