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Radeon HD 3690/3830 vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 3690/3830 features a core clock frequency of 668 MHz and a GDDR3 memory frequency of 828 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, 16 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6450 (OEM), which has a GPU core clock speed of 625 MHz, and 512 MB of GDDR3 RAM set to run at 800 MHz through a 64-bit bus. It also features 160 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 31 Watts
Radeon HD 3690/3830 75 Watts
Difference: 44 Watts (142%)

Memory Bandwidth

Theoretically, the Radeon HD 3690/3830 should be much faster than the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 3690/3830 26496 MB/sec
Radeon HD 6450 (OEM) 12800 MB/sec
Difference: 13696 (107%)

Texel Rate

The Radeon HD 3690/3830 is much (approximately 114%) faster with regards to anisotropic filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 3690/3830 10688 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 5688 (114%)

Pixel Rate

The Radeon HD 3690/3830 will be a lot (approximately 328%) more effective at AA than the Radeon HD 6450 (OEM), and able to handle higher resolutions better. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 8188 (328%)

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 3690/3830

Amazon.com

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Radeon HD 6450 (OEM)

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 3690/3830 Radeon HD 6450 (OEM)
Manufacturer AMD AMD
Year 2008 February 2011
Code Name RV670 PRO Caicos
Memory 256 MB 512 MB
Core Speed 668 MHz 625 MHz
Memory Speed 1656 MHz 1600 MHz
Power (Max TDP) 75 watts 31 watts
Bandwidth 26496 MB/sec 12800 MB/sec
Texel Rate 10688 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 320(64x5) 160
Texture Mapping Units 16 8
Render Output Units 16 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 370 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, 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 number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 3690/3830

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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