Radeon HD 4770 vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which features core clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 TAUs 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 390X 8G		275 Watts
	Difference: 195 Watts (244%)

Memory Bandwidth

The Radeon R9 390X 8G, in theory, should perform much faster than the Radeon HD 4770 overall. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be a lot (more or less 670%) faster with regards to 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 running with a high resolution is important to you, then the Radeon R9 390X 8G is a better choice, 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 max amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.