Radeon HD 4770 vs Radeon R9 380 2G

Intro

Compare those specifications to the Radeon R9 380 2G, which comes with GPU core speed of 970 MHz, and 2048 MB of GDDR5 RAM running at 1425 MHz through a 256-bit bus. It also features 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon R9 380 2G		190 Watts
	Difference: 110 Watts (138%)

Memory Bandwidth

In theory, the Radeon R9 380 2G should be 256% quicker than the Radeon HD 4770 in general, because of its higher bandwidth. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 131200 (256%)

Texel Rate

The Radeon R9 380 2G will be a lot (more or less 353%) better at AF than the Radeon HD 4770. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 84640 (353%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 380 2G is the winner, and very much so. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 19040 (159%)

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 transported across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.