Radeon HD 5770 vs Radeon R9 270

Intro

Compare that to the Radeon R9 270, which features a clock frequency of 900 MHz and a GDDR5 memory frequency of 1400 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It features 1280 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon R9 270		150 Watts
	Difference: 42 Watts (39%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 270 should perform a lot faster than the Radeon HD 5770 overall. (explain)

Radeon R9 270		179200 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 102400 (133%)

Texel Rate

The Radeon R9 270 should be much (approximately 112%) more effective at texture filtering than the Radeon HD 5770. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 38000 (112%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 270 is the winner, by a large margin. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 15200 (112%)

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 max amount of information (in units of MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.