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Radeon HD 3850 1GB vs Radeon HD 4850 512MB

Intro

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

Compare those specs to the Radeon HD 4850 512MB, which comes with core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs along with 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 512MB 110 Watts
Difference: 35 Watts (47%)

Memory Bandwidth

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

Radeon HD 4850 512MB 63552 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 10560 (20%)

Texel Rate

The Radeon HD 4850 512MB is much (more or less 134%) better at anisotropic filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4850 512MB 25000 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 14312 (134%)

Pixel Rate

The Radeon HD 3850 1GB is a bit (about 7%) more effective at full screen anti-aliasing than the Radeon HD 4850 512MB, and should be capable of handling higher screen resolutions better. (explain)

Radeon HD 3850 1GB 10688 Mpixels/sec
Radeon HD 4850 512MB 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 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 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Jun 25, 2008
Code Name RV670 PRO RV770 PRO
Memory 1024 MB 512 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 GDDR3
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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4850 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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