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Radeon HD 3850 1GB vs Radeon HD 6750 1GB

Intro

The Radeon HD 3850 1GB has a core clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this particular card. It features 720 SPUs along with 36 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB 75 Watts
Radeon HD 6750 1GB 86 Watts
Difference: 11 Watts (15%)

Memory Bandwidth

Performance-wise, the Radeon HD 6750 1GB should theoretically be a lot better than the Radeon HD 3850 1GB overall. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 11008 (21%)

Texel Rate

The Radeon HD 6750 1GB should be quite a bit (more or less 144%) better at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 15412 (144%)

Pixel Rate

The Radeon HD 6750 1GB will be just a bit (approximately 9%) faster with regards to FSAA than the Radeon HD 3850 1GB, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
Radeon HD 3850 1GB 10688 Mpixels/sec
Difference: 912 (9%)

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 3850 1GB

Amazon.com

Check prices at:

Radeon HD 6750 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 3850 1GB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 January 2011
Code Name RV670 PRO Juniper Pro
Memory 1024 MB 1024 MB
Core Speed 668 MHz 725 MHz
Memory Speed 1656 MHz 4000 MHz
Power (Max TDP) 75 watts 86 watts
Bandwidth 52992 MB/sec 64000 MB/sec
Texel Rate 10688 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) 720
Texture Mapping Units 16 36
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-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 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 6750 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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