GeForce GTX 650 vs Radeon R9 M265X

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should theoretically be a bit superior to the Radeon R9 M265X in general. (explain)

GeForce GTX 650		80000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 8000 (11%)

Texel Rate

The GeForce GTX 650 will be much (more or less 47%) better at AF than the Radeon R9 M265X. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 10856 (47%)

Pixel Rate

The GeForce GTX 650 will be a lot (approximately 84%) faster with regards to full screen anti-aliasing than the Radeon R9 M265X, and also capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 7728 (84%)

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 (measured in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.