GeForce GTX 260 216SP 55 nm vs Radeon R9 M265X

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 260 216SP 55 nm should perform much faster than the Radeon R9 M265X overall. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 39888 (55%)

Texel Rate

The GeForce GTX 260 216SP 55 nm will be much (more or less 80%) faster with regards to texture filtering than the Radeon R9 M265X. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 18472 (80%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 260 216SP 55 nm is a better choice, and very much so. (explain)

GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 6928 (75%)

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 largest amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video 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 record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.