Radeon HD 7770 vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has clocked the core speed at 1050 MHz. The GDDR5 memory works at a frequency of 1500 MHz on this specific model. It features 2816 SPUs along with 176 Texture Address Units and 64 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 390X 8G		13555 points
Radeon HD 7770		3180 points
	Difference: 10375 (326%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 195 Watts (244%)

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should theoretically be much superior to the Radeon HD 7770 overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 312000 (433%)

Texel Rate

The Radeon R9 390X 8G should be a lot (about 362%) faster with regards to AF than the Radeon HD 7770. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 144800 (362%)

Pixel Rate

The Radeon R9 390X 8G is much (more or less 320%) faster with regards to full screen anti-aliasing than the Radeon HD 7770, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 51200 (320%)

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's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number 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 filling the screen with pixels (the image). The actual pixel 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 maximum fill rate.