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Radeon HD 3850 256MB vs Radeon HD 4830 1GB

Intro

The Radeon HD 3850 256MB features a core clock frequency of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also features a 256-bit bus, and makes use of 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 4830 1GB, which comes with GPU clock speed of 575 MHz, and 1024 MB of GDDR4 memory running at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 20 Watts (27%)

Memory Bandwidth

The Radeon HD 4830 1GB should theoretically perform a small bit faster than the Radeon HD 3850 256MB in general. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 4608 (9%)

Texel Rate

The Radeon HD 4830 1GB should be much (more or less 72%) faster with regards to texture filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 4830 1GB 18400 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 7712 (72%)

Pixel Rate

The Radeon HD 3850 256MB will be a bit (approximately 16%) faster with regards to anti-aliasing than the Radeon HD 4830 1GB, and also will be able to handle higher resolutions better. (explain)

Radeon HD 3850 256MB 10688 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 1488 (16%)

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 256MB

Amazon.com

Check prices at:

Radeon HD 4830 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 256MB Radeon HD 4830 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 256 MB 1024 MB
Core Speed 668 MHz 575 MHz
Memory Speed 1656 MHz 1800 MHz
Power (Max TDP) 75 watts 95 watts
Bandwidth 52992 MB/sec 57600 MB/sec
Texel Rate 10688 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
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 max amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 256MB

Amazon.com

Check prices at:

Radeon HD 4830 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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