Radeon HD 6770 vs Radeon R9 390X 8G

Intro

Compare all that to the Radeon R9 390X 8G, which has a core clock frequency of 1050 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 512-bit memory bus, and uses a 28 nm design. It is comprised of 2816 SPUs, 176 TAUs, 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 6770		1520 points
	Difference: 12035 (792%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 167 Watts (155%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should perform much faster than the Radeon HD 6770 in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 316800 (471%)

Texel Rate

The Radeon R9 390X 8G will be much (approximately 413%) better at AF than the Radeon HD 6770. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 148800 (413%)

Pixel Rate

The Radeon R9 390X 8G is a lot (about 367%) better at FSAA than the Radeon HD 6770, and able to handle higher resolutions while still performing well. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 52800 (367%)

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 largest amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of 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 in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.