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Radeon HD 3850 1GB vs Radeon HD 4850 X2 1GB

Intro

The Radeon HD 3850 1GB comes with a GPU core clock speed of 668 MHz, and the 1024 MB of GDDR3 memory runs at 828 MHz through a 256-bit bus. It also is made up of 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4850 X2 1GB, which has clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB 75 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 175 Watts (233%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB is 140% faster than the Radeon HD 3850 1GB overall, because of its higher data rate. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 74112 (140%)

Texel Rate

The Radeon HD 4850 X2 1GB is much (about 368%) more effective at AF than the Radeon HD 3850 1GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 39312 (368%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (about 87%) better at FSAA than the Radeon HD 3850 1GB, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 3850 1GB 10688 Mpixels/sec
Difference: 9312 (87%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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.

Specifications

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Model Radeon HD 3850 1GB Radeon HD 4850 X2 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 Nov 7, 2008
Code Name RV670 PRO R700
Memory 1024 MB 1024 MB (x2)
Core Speed 668 MHz 625 MHz (x2)
Memory Speed 1656 MHz 1986 MHz (x2)
Power (Max TDP) 75 watts 250 watts
Bandwidth 52992 MB/sec 127104 MB/sec
Texel Rate 10688 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 320(64x5) 800(160x5) (x2)
Texture Mapping Units 16 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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