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Radeon HD 3850 X2 vs Radeon HD 6750 1GB

Intro

The Radeon HD 3850 X2 uses a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM is set to run at a speed of 828 MHz on this particular card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6750 1GB, which features a core clock frequency of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It features 720 SPUs, 36 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 X2 should in theory be a lot superior to the Radeon HD 6750 1GB in general. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 41984 (66%)

Texel Rate

The Radeon HD 6750 1GB will be a lot (approximately 22%) faster with regards to anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 4724 (22%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3850 X2 is a better choice, by a large margin. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 9776 (84%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3850 X2

Amazon.com

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Radeon HD 6750 1GB

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 3850 X2 Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Apr 4, 2008 January 2011
Code Name RV670 PRO Juniper Pro
Memory 512 MB (x2) 1024 MB
Core Speed 668 MHz (x2) 725 MHz
Memory Speed 1656 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 86 watts
Bandwidth 105984 MB/sec 64000 MB/sec
Texel Rate 21376 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) (x2) 720
Texture Mapping Units 16 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 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 past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 can be applied 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 video 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 record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 3850 X2

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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