GeForce GTX 650 vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which features a clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon R9 M280X		75 Watts
	Difference: 11 Watts (17%)

Memory Bandwidth

Theoretically, the Radeon R9 M280X should perform just a bit faster than the GeForce GTX 650 in general. (explain)

Radeon R9 M280X		88000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 8000 (10%)

Texel Rate

The Radeon R9 M280X will be much (about 49%) more effective at AF than the GeForce GTX 650. (explain)

Radeon R9 M280X		50400 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 16544 (49%)

Pixel Rate

The GeForce GTX 650 is a bit (about 18%) faster with regards to anti-aliasing than the Radeon R9 M280X, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 2528 (18%)

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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.