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Radeon HD 6770 vs Radeon R9 390 8G

Intro

The Radeon HD 6770 makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this model. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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

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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 390 8G 12733 points
Radeon HD 6770 1520 points
Difference: 11213 (738%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should be a lot faster than the Radeon HD 6770 in general. (explain)

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

Texel Rate

The Radeon R9 390 8G is quite a bit (approximately 344%) more effective at AF than the Radeon HD 6770. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 124000 (344%)

Pixel Rate

The Radeon R9 390 8G will be much (more or less 344%) better at anti-aliasing than the Radeon HD 6770, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 49600 (344%)

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

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Radeon HD 6770

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6770 Radeon R9 390 8G
Manufacturer AMD AMD
Year January 2011 June 2015
Code Name Juniper XT Grenada PRO
Memory 512 MB 8192 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 6000 MHz
Power (Max TDP) 108 watts 275 watts
Bandwidth 67200 MB/sec 384000 MB/sec
Texel Rate 36000 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 800 2560
Texture Mapping Units 40 160
Render Output Units 16 64
Bus Type GDDR5 GDDR5
Bus Width 128-bit 512-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 6200 million
Bus PCIe x16 PCIe 3.0 ×16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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

Display Prices

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Radeon HD 6770

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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