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Radeon HD 3850 X2 vs Radeon HD 4770

Intro

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

Compare all of that to the Radeon HD 4770, which features core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 3850 X2 should be much faster than the Radeon HD 4770 overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 54784 (107%)

Texel Rate

The Radeon HD 4770 will be a bit (approximately 12%) faster with regards to anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 2624 (12%)

Pixel Rate

The Radeon HD 3850 X2 will be much (about 78%) better at FSAA than the Radeon HD 4770, and also able to handle higher resolutions better. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 9376 (78%)

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

Check prices at:

Radeon HD 4770

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 X2 Radeon HD 4770
Manufacturer AMD AMD
Year Apr 4, 2008 Apr 28, 2009
Code Name RV670 PRO RV740
Memory 512 MB (x2) 512 MB
Core Speed 668 MHz (x2) 750 MHz
Memory Speed 1656 MHz (x2) 3200 MHz
Power (Max TDP) (Unknown) watts 80 watts
Bandwidth 105984 MB/sec 51200 MB/sec
Texel Rate 21376 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 320(64x5) (x2) 640(128x5)
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 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its 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 - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 3850 X2

Amazon.com

Check prices at:

Radeon HD 4770

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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