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Radeon HD 3850 X2 vs Radeon HD 5670

Intro

The Radeon HD 3850 X2 has clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 5670, which makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 memory runs at a speed of 1000 MHz on this model. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3850 X2 should be 66% quicker than the Radeon HD 5670 overall, due to its greater data rate. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 41984 (66%)

Texel Rate

The Radeon HD 3850 X2 will be a lot (approximately 38%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 5876 (38%)

Pixel Rate

The Radeon HD 3850 X2 should be a lot (approximately 245%) more effective at full screen anti-aliasing than the Radeon HD 5670, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 15176 (245%)

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 5670

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 5670
Manufacturer AMD AMD
Year Apr 4, 2008 January 14, 2010
Code Name RV670 PRO Redwood XT
Memory 512 MB (x2) 1024 MB
Core Speed 668 MHz (x2) 775 MHz
Memory Speed 1656 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 61 watts
Bandwidth 105984 MB/sec 64000 MB/sec
Texel Rate 21376 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 400(80x5)
Texture Mapping Units 16 (x2) 20
Render Output Units 16 (x2) 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 627 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on 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 get to the max fill rate.

Display Prices

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Radeon HD 3850 X2

Amazon.com

Check prices at:

Radeon HD 5670

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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