Radeon HD 4770 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which features GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 Texture Address Units, and 64 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 390 8G		275 Watts
	Difference: 195 Watts (244%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should in theory be a lot superior to the Radeon HD 4770 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 332800 (650%)

Texel Rate

The Radeon R9 390 8G should be much (approximately 567%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 136000 (567%)

Pixel Rate

The Radeon R9 390 8G is much (approximately 433%) better at FSAA than the Radeon HD 4770, and should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 52000 (433%)

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 maximum amount of data (measured in megabytes per second) that can be moved 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 it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.