Radeon HD 4770 vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which comes with core speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 195 Watts (244%)

Memory Bandwidth

Theoretically, the Radeon R9 390X 8G should be much faster than the Radeon HD 4770 in general. (explain)

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

Texel Rate

The Radeon R9 390X 8G will be quite a bit (approximately 670%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 160800 (670%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4770, by far. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 55200 (460%)

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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could 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 Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.