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Radeon HD 3650 vs Radeon HD 6750

Intro

The Radeon HD 3650 features core clock speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 memory. It features 120(24x5) SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare that to the Radeon HD 6750, which features a clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 720 SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 78 Watts
Radeon HD 6750 86 Watts
Difference: 8 Watts (10%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6750 should be 150% faster than the Radeon HD 3650 in general, because of its greater bandwidth. (explain)

Radeon HD 6750 64000 MB/sec
Radeon HD 3650 25600 MB/sec
Difference: 38400 (150%)

Texel Rate

The Radeon HD 6750 should be much (approximately 350%) faster with regards to texture filtering than the Radeon HD 3650. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 3650 5800 Mtexels/sec
Difference: 20300 (350%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6750 is a better choice, by far. (explain)

Radeon HD 6750 11600 Mpixels/sec
Radeon HD 3650 2900 Mpixels/sec
Difference: 8700 (300%)

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 6750

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 6750
Manufacturer AMD AMD
Year 2008 January 2011
Code Name RV635 PRO Juniper Pro
Memory 1024 MB 512 MB
Core Speed 725 MHz 725 MHz
Memory Speed 1600 MHz 4000 MHz
Power (Max TDP) 78 watts 86 watts
Bandwidth 25600 MB/sec 64000 MB/sec
Texel Rate 5800 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 120(24x5) 720
Texture Mapping Units 8 36
Render Output Units 4 16
Bus Type GDDR4 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) 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 4.0

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of 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 fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 3650

Amazon.com

Check prices at:

Radeon HD 6750

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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