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Radeon HD 3850 1GB vs Radeon HD 4850 2GB

Intro

The Radeon HD 3850 1GB has a clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4850 2GB, which features a GPU core clock speed of 625 MHz, and 2048 MB of GDDR4 RAM running at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, 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 2GB 110 Watts
Difference: 35 Watts (47%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 2GB should theoretically be just a bit better than the Radeon HD 3850 1GB overall. (explain)

Radeon HD 4850 2GB 63552 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 10560 (20%)

Texel Rate

The Radeon HD 4850 2GB should be much (about 134%) better at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 14312 (134%)

Pixel Rate

The Radeon HD 3850 1GB is a bit (approximately 7%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 2GB, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 3850 1GB 10688 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 688 (7%)

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.

Price Comparison

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Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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 2GB
Manufacturer AMD AMD
Year Nov 19, 2007 Jun 25, 2008
Code Name RV670 PRO RV770 PRO
Memory 1024 MB 2048 MB
Core Speed 668 MHz 625 MHz
Memory Speed 1656 MHz 1986 MHz
Power (Max TDP) 75 watts 110 watts
Bandwidth 52992 MB/sec 63552 MB/sec
Texel Rate 10688 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 320(64x5) 800(160x5)
Texture Mapping Units 16 40
Render Output Units 16 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 x16/AGP 8x 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 maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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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