Radeon HD 5770 vs Radeon R9 M270X

Intro

Compare all of that to the Radeon R9 M270X, which has a GPU core clock speed of 725 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 5770 should in theory be a small bit faster than 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 is just a bit (more or less 17%) faster with regards to texture 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 just a bit (more or less 17%) more effective at anti-aliasing than the Radeon R9 M270X, and will be able to handle 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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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