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Radeon HD 4650 512MB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4650 512MB uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The DDR2 RAM works at a speed of 500 MHz on this particular model. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

Compare that to the Radeon HD 6770 1GB, which comes with a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB 55 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 53 Watts (96%)

Memory Bandwidth

The Radeon HD 6770 1GB should in theory be a lot faster than the Radeon HD 4650 512MB in general. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 51200 (320%)

Texel Rate

The Radeon HD 6770 1GB will be a lot (more or less 88%) more effective at texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 16800 (88%)

Pixel Rate

The Radeon HD 6770 1GB will be much (more or less 200%) better at FSAA than the Radeon HD 4650 512MB, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 9600 (200%)

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 4650 512MB

Amazon.com

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Radeon HD 6770 1GB

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 4650 512MB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 January 2011
Code Name RV730 PRO Juniper XT
Memory 512 MB 1024 MB
Core Speed 600 MHz 900 MHz
Memory Speed 1000 MHz 4200 MHz
Power (Max TDP) 55 watts 108 watts
Bandwidth 16000 MB/sec 67200 MB/sec
Texel Rate 19200 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 320(64x5) 800
Texture Mapping Units 32 40
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 514 million 1040 million
Bus PCIe 2.0 x16, AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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

Display Prices

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Radeon HD 4650 512MB

Amazon.com

Check prices at:

Radeon HD 6770 1GB

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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