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Radeon HD 3850 X2 vs Radeon HD 7750

Intro

The Radeon HD 3850 X2 features a clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 7750, which uses a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this specific card. It features 512 SPUs along with 32 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 theoretically be much superior to the Radeon HD 7750 overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 33984 (47%)

Texel Rate

The Radeon HD 7750 is a small bit (about 20%) faster with regards to AF than the Radeon HD 3850 X2. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 4224 (20%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 3850 X2 is superior to the Radeon HD 7750, by far. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 8576 (67%)

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 7750

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 7750
Manufacturer AMD AMD
Year Apr 4, 2008 February 2012
Code Name RV670 PRO Cape Verde Pro
Memory 512 MB (x2) 1024 MB
Core Speed 668 MHz (x2) 800 MHz
Memory Speed 1656 MHz (x2) 4500 MHz
Power (Max TDP) (Unknown) watts 55 watts
Bandwidth 105984 MB/sec 72000 MB/sec
Texel Rate 21376 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) (x2) 512
Texture Mapping Units 16 (x2) 32
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 1500 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses 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 number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 3850 X2

Amazon.com

Check prices at:

Radeon HD 7750

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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