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Radeon HD 3650 vs Radeon HD 6450 (OEM) 1GB

Intro

The Radeon HD 3650 has a core clock frequency of 725 MHz and a GDDR4 memory frequency of 800 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It is comprised of 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare all that to the Radeon HD 6450 (OEM) 1GB, which uses a 40 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory runs at a speed of 900 MHz on this particular card. It features 160 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
Radeon HD 3650 78 Watts
Difference: 47 Watts (152%)

Memory Bandwidth

The Radeon HD 6450 (OEM) 1GB should theoretically be just a bit faster than the Radeon HD 3650 overall. (explain)

Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Radeon HD 3650 25600 MB/sec
Difference: 3200 (13%)

Texel Rate

The Radeon HD 6450 (OEM) 1GB should be just a bit (more or less 3%) better at texture filtering than the Radeon HD 3650. (explain)

Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Radeon HD 3650 5800 Mtexels/sec
Difference: 200 (3%)

Pixel Rate

The Radeon HD 6450 (OEM) 1GB should be just a bit (more or less 3%) better at AA than the Radeon HD 3650, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Radeon HD 3650 2900 Mpixels/sec
Difference: 100 (3%)

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 3650

Amazon.com

Check prices at:

Radeon HD 6450 (OEM) 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.

Specifications

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Model Radeon HD 3650 Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year 2008 February 2011
Code Name RV635 PRO Caicos
Memory 1024 MB 1024 MB
Core Speed 725 MHz 750 MHz
Memory Speed 1600 MHz 3600 MHz
Power (Max TDP) 78 watts 31 watts
Bandwidth 25600 MB/sec 28800 MB/sec
Texel Rate 5800 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 3000 Mpixels/sec
Unified Shaders 120(24x5) 160
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type GDDR4 GDDR5
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 370 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the 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 that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 rate also depends on many 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 3650

Amazon.com

Check prices at:

Radeon HD 6450 (OEM) 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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