Radeon HD 7870 XT vs Radeon R7 M260X

Intro

Compare those specs to the Radeon R7 M260X, which features a clock frequency of 825 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT will be 200% quicker than the Radeon R7 M260X overall, due to its higher bandwidth. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R7 M260X		64000 MB/sec
	Difference: 128000 (200%)

Texel Rate

The Radeon HD 7870 XT is quite a bit (about 348%) more effective at anisotropic filtering than the Radeon R7 M260X. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon R7 M260X		19800 Mtexels/sec
	Difference: 69000 (348%)

Pixel Rate

The Radeon HD 7870 XT should be much (approximately 348%) better at FSAA than the Radeon R7 M260X, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon R7 M260X		6600 Mpixels/sec
	Difference: 23000 (348%)

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 information (counted in megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core 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 many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.