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Radeon HD 3850 1GB vs Radeon HD 4830 512MB

Intro

The Radeon HD 3850 1GB features a GPU clock 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 is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4830 512MB, which has a core clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 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 4830 512MB 95 Watts
Difference: 20 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4830 512MB should be a little bit faster than the Radeon HD 3850 1GB in general. (explain)

Radeon HD 4830 512MB 57600 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 4608 (9%)

Texel Rate

The Radeon HD 4830 512MB will be much (about 72%) more effective at AF than the Radeon HD 3850 1GB. (explain)

Radeon HD 4830 512MB 18400 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 7712 (72%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 3850 1GB is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 3850 1GB 10688 Mpixels/sec
Radeon HD 4830 512MB 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 1GB

Amazon.com

Check prices at:

Radeon HD 4830 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 4830 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 1024 MB 512 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 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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4830 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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