Radeon HD 4770 vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It features 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

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

The Radeon R9 390 8G, in theory, should be much faster than 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 is a lot (approximately 567%) more effective at AF 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%) more effective at full screen anti-aliasing than the Radeon HD 4770, and also should be able to handle 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 (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.