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Radeon HD 3850 1GB vs Radeon HD 4850 X2 512MB

Intro

The Radeon HD 3850 1GB comes with a GPU core speed of 668 MHz, and the 1024 MB of GDDR3 RAM is set to run at 828 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4850 X2 512MB, which has GPU clock speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB 75 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 175 Watts (233%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 512MB should in theory be quite a bit superior to the Radeon HD 3850 1GB overall. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 74112 (140%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (approximately 368%) better at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 39312 (368%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4850 X2 512MB is the winner, by a large margin. (explain)

Radeon HD 4850 X2 512MB 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 512MB

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 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Nov 7, 2008
Code Name RV670 PRO R700
Memory 1024 MB 512 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 max amount of information (in units of MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the 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 can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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