Radeon HD 5770 vs Radeon R9 M270X

Intro

Compare that to the Radeon R9 M270X, which has a GPU core clock speed of 725 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 5770 should in theory be just a bit superior to the Radeon R9 M270X in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 4800 (7%)

Texel Rate

The Radeon HD 5770 will be a small bit (about 17%) better at anisotropic filtering than the Radeon R9 M270X. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 5000 (17%)

Pixel Rate

The Radeon HD 5770 is a bit (about 17%) better at FSAA than the Radeon R9 M270X, and also will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 2000 (17%)

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 moved over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of 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 applied in one second.

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