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Radeon HD 7770 vs Radeon R9 390X 8G

Intro

The Radeon HD 7770 comes with clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has set the core speed at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this model. It features 2816 SPUs as well as 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 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

The Radeon R9 390X 8G, in theory, should be quite a bit faster than 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 is quite a bit (more or less 362%) more effective at anisotropic filtering 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 should be quite a bit (approximately 320%) faster with regards to FSAA than the Radeon HD 7770, and capable of handling higher screen resolutions more effectively. (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

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Radeon HD 7770

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 7770 Radeon R9 390X 8G
Manufacturer AMD AMD
Year February 2012 June 2015
Code Name Cape Verde XT Grenada XT
Memory 1024 MB 8192 MB
Core Speed 1000 MHz 1050 MHz
Memory Speed 4500 MHz 6000 MHz
Power (Max TDP) 80 watts 275 watts
Bandwidth 72000 MB/sec 384000 MB/sec
Texel Rate 40000 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 640 2816
Texture Mapping Units 40 176
Render Output Units 16 64
Bus Type GDDR5 GDDR5
Bus Width 128-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred over 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, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 number is worked out by multiplying the total amount of texture units of the card by the core clock 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 in one second.

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

Display Prices

Hide Prices

Radeon HD 7770

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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