Radeon HD 4770 vs Radeon R7 M260

Intro

Compare all of that to the Radeon R7 M260, which has a clock speed of 715 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit memory bus, and uses 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

The Radeon HD 4770 should theoretically be much faster than the Radeon R7 M260 in general. (explain)

Radeon HD 4770		51200 MB/sec
Radeon R7 M260		16000 MB/sec
	Difference: 35200 (220%)

Texel Rate

The Radeon HD 4770 should be quite a bit (about 40%) faster with regards to anisotropic filtering than the Radeon R7 M260. (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon R7 M260		17160 Mtexels/sec
	Difference: 6840 (40%)

Pixel Rate

The Radeon HD 4770 should be a lot (more or less 110%) more effective at AA than the Radeon R7 M260, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon R7 M260		5720 Mpixels/sec
	Difference: 6280 (110%)

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 largest amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a 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 calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.