Radeon HD 5770 vs Radeon R9 M265X

Intro

Compare all that to the Radeon R9 M265X, which has GPU clock speed of 575 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 5770 should in theory perform a little bit faster than the Radeon R9 M265X overall. (explain)

Radeon HD 5770		76800 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 4800 (7%)

Texel Rate

The Radeon HD 5770 should be quite a bit (approximately 48%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 11000 (48%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5770 is a better choice, by a large margin. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 4400 (48%)

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 (measured in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If 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 per second. This is worked out by multiplying the total texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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 potential to get to the maximum fill rate.