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Radeon HD 4830 1GB vs Radeon HD 4850 X2 1GB

Intro

The Radeon HD 4830 1GB has core speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 4850 X2 1GB, which features a core clock speed of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB 95 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 155 Watts (163%)

Memory Bandwidth

The Radeon HD 4850 X2 1GB, in theory, should perform quite a bit faster than the Radeon HD 4830 1GB in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 69504 (121%)

Texel Rate

The Radeon HD 4850 X2 1GB will be much (approximately 172%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 31600 (172%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be a lot (approximately 117%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 10800 (117%)

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 4830 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 4830 1GB Radeon HD 4850 X2 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 Nov 7, 2008
Code Name RV770 LE R700
Memory 1024 MB 1024 MB (x2)
Core Speed 575 MHz 625 MHz (x2)
Memory Speed 1800 MHz 1986 MHz (x2)
Power (Max TDP) 95 watts 250 watts
Bandwidth 57600 MB/sec 127104 MB/sec
Texel Rate 18400 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5) (x2)
Texture Mapping Units 32 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR4 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16 (PCIe bridge)
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 (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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