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Radeon HD 4670 1GB vs Radeon HD 7770


The Radeon HD 4670 1GB comes with a core clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1100 MHz. It also makes use of a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Compare those specifications to the Radeon HD 7770, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this particular model. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB 70 Watts
Radeon HD 7770 80 Watts
Difference: 10 Watts (14%)

Memory Bandwidth

The Radeon HD 7770, in theory, should be much faster than the Radeon HD 4670 1GB overall. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 4670 1GB 35200 MB/sec
Difference: 36800 (105%)

Texel Rate

The Radeon HD 7770 will be much (about 67%) better at texture filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 4670 1GB 24000 Mtexels/sec
Difference: 16000 (67%)

Pixel Rate

The Radeon HD 7770 will be quite a bit (about 167%) faster with regards to anti-aliasing than the Radeon HD 4670 1GB, and should be capable of handling higher screen resolutions better. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 10000 (167%)

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 4670 1GB

Radeon HD 7770

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.


Display Specifications

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Model Radeon HD 4670 1GB Radeon HD 7770
Manufacturer AMD AMD
Year Sep 10, 2008 February 2012
Code Name RV730 XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 750 MHz 1000 MHz
Memory Speed 2200 MHz 4500 MHz
Power (Max TDP) 70 watts 80 watts
Bandwidth 35200 MB/sec 72000 MB/sec
Texel Rate 24000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 320(64x5) 640
Texture Mapping Units 32 40
Render Output Units 8 16
Bus Width 128-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 514 million 1500 million
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must 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 texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, 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 maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated 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 output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.


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