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Radeon HD 3850 X2 vs Radeon HD 4770

Intro

The Radeon HD 3850 X2 comes with core clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 4770, which has a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2, in theory, 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 is just a bit (about 12%) more effective at 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 should be much (approximately 78%) faster with regards to full screen anti-aliasing than the Radeon HD 4770, and also should be capable of handling higher screen 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: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach 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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