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Radeon HD 6450 (OEM) 1GB vs Radeon HD 6770

Intro

The Radeon HD 6450 (OEM) 1GB has a clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also features a 64-bit bus, and uses a 40 nm design. It is made up of 160 SPUs, 8 TAUs, and 4 ROPs.

Compare those specifications to the Radeon HD 6770, which comes with GPU core speed of 900 MHz, and 512 MB of GDDR5 RAM running at 1050 MHz through a 128-bit bus. It also features 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
Radeon HD 6770 108 Watts
Difference: 77 Watts (248%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 will be 133% quicker than the Radeon HD 6450 (OEM) 1GB overall, due to its higher data rate. (explain)

Radeon HD 6770 67200 MB/sec
Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Difference: 38400 (133%)

Texel Rate

The Radeon HD 6770 will be quite a bit (more or less 500%) more effective at AF than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 6770 36000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Difference: 30000 (500%)

Pixel Rate

The Radeon HD 6770 is quite a bit (approximately 380%) faster with regards to FSAA than the Radeon HD 6450 (OEM) 1GB, and also should be able to handle higher resolutions better. (explain)

Radeon HD 6770 14400 Mpixels/sec
Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Difference: 11400 (380%)

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 6450 (OEM) 1GB

Amazon.com

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Radeon HD 6770

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 6450 (OEM) 1GB Radeon HD 6770
Manufacturer AMD AMD
Year February 2011 January 2011
Code Name Caicos Juniper XT
Memory 1024 MB 512 MB
Core Speed 750 MHz 900 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 31 watts 108 watts
Bandwidth 28800 MB/sec 67200 MB/sec
Texel Rate 6000 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 3000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 160 800
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type GDDR5 GDDR5
Bus Width 64-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 370 million 1040 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 applied in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6450 (OEM) 1GB

Amazon.com

Check prices at:

Radeon HD 6770

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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