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Radeon HD 4770 vs Radeon HD 7770

Intro

The Radeon HD 4770 features a core clock frequency of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 7770, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 is 41% quicker than the Radeon HD 4770 overall, due to its greater data rate. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 20800 (41%)

Texel Rate

The Radeon HD 7770 should be much (about 67%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 16000 (67%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7770 is the winner, by a large margin. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 4000 (33%)

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 4770

Amazon.com

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Radeon HD 7770

Amazon.com

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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 4770 Radeon HD 7770
Manufacturer AMD AMD
Year Apr 28, 2009 February 2012
Code Name RV740 Cape Verde XT
Memory 512 MB 1024 MB
Core Speed 750 MHz 1000 MHz
Memory Speed 3200 MHz 4500 MHz
Power (Max TDP) 80 watts 80 watts
Bandwidth 51200 MB/sec 72000 MB/sec
Texel Rate 24000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 640(128x5) 640
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 826 million 1500 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must 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 high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip 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 number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 7770

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.

Comments

One Response to “Radeon HD 4770 vs Radeon HD 7770”
hadeka says:

i'm using a radeon 4770 on a system using a corsair cx 400w, if i want to upgrade it into radeon 7770, there shouldn't be any problem, am i right?

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