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Radeon HD 6770 vs Radeon R9 390X 8G

Intro

The Radeon HD 6770 has a GPU core clock speed of 900 MHz, and the 512 MB of GDDR5 memory is set to run at 1050 MHz through a 128-bit bus. It also is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon R9 390X 8G, which has core clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs along with 176 TAUs and 64 ROPs.

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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

The Radeon R9 390X 8G should in theory perform quite a bit 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 should be a lot (approximately 413%) faster with regards to 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

If using a high resolution is important to you, then the Radeon R9 390X 8G is the winner, by far. (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

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Radeon HD 6770

Amazon.com

Check prices at:

Radeon R9 390X 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 390X 8G
Manufacturer AMD AMD
Year January 2011 June 2015
Code Name Juniper XT Grenada XT
Memory 512 MB 8192 MB
Core Speed 900 MHz 1050 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 184800 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 800 2816
Texture Mapping Units 40 176
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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 6770

Amazon.com

Check prices at:

Radeon R9 390X 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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