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Radeon HD 3650 256MB vs Radeon HD 3850 512MB

Intro

The Radeon HD 3650 256MB has a clock frequency of 725 MHz and a DDR2 memory speed of 800 MHz. It also uses a 128-bit memory bus, and uses a 55 nm design. It features 120(24x5) SPUs, 8 TAUs, and 4 ROPs.

Compare all of that to the Radeon HD 3850 512MB, which has a core clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon HD 3650 256MB 78 Watts
Difference: 3 Watts (4%)

Memory Bandwidth

In theory, the Radeon HD 3850 512MB should be quite a bit faster than the Radeon HD 3650 256MB in general. (explain)

Radeon HD 3850 512MB 52992 MB/sec
Radeon HD 3650 256MB 25600 MB/sec
Difference: 27392 (107%)

Texel Rate

The Radeon HD 3850 512MB will be a lot (about 84%) more effective at AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 3850 512MB 10688 Mtexels/sec
Radeon HD 3650 256MB 5800 Mtexels/sec
Difference: 4888 (84%)

Pixel Rate

The Radeon HD 3850 512MB is quite a bit (approximately 269%) better at anti-aliasing than the Radeon HD 3650 256MB, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 3850 512MB 10688 Mpixels/sec
Radeon HD 3650 256MB 2900 Mpixels/sec
Difference: 7788 (269%)

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 256MB

Amazon.com

Check prices at:

Radeon HD 3850 512MB

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 256MB Radeon HD 3850 512MB
Manufacturer AMD AMD
Year 2008 Nov 19, 2007
Code Name RV635 PRO RV670 PRO
Memory 256 MB 512 MB
Core Speed 725 MHz 668 MHz
Memory Speed 1600 MHz 1656 MHz
Power (Max TDP) 78 watts 75 watts
Bandwidth 25600 MB/sec 52992 MB/sec
Texel Rate 5800 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 120(24x5) 320(64x5)
Texture Mapping Units 8 16
Render Output Units 4 16
Bus Type DDR2 GDDR3
Bus Width 128-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels 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 colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3650 256MB

Amazon.com

Check prices at:

Radeon HD 3850 512MB

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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