Radeon HD 5770 vs Radeon R9 M275X

Intro

Compare that to the Radeon R9 M275X, which features a core clock speed of 900 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 5770		108 Watts
	Difference: 58 Watts (116%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5770 should theoretically be a bit better than the Radeon R9 M275X in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 4800 (7%)

Texel Rate

The Radeon R9 M275X is just a bit (approximately 6%) faster with regards to AF than the Radeon HD 5770. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 2000 (6%)

Pixel Rate

The Radeon R9 M275X will be a small bit (more or less 6%) better at full screen anti-aliasing than the Radeon HD 5770, and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 800 (6%)

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 information (counted in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better 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 one second.

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