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Radeon HD 4830 1GB vs Radeon HD 4890 1GB

Intro

The Radeon HD 4830 1GB uses a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR4 RAM works at a speed of 900 MHz on this particular card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4890 1GB, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up 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 4890 1GB 190 Watts
Difference: 95 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB should perform quite a bit faster than the Radeon HD 4830 1GB overall. (explain)

Radeon HD 4890 1GB 124800 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 67200 (117%)

Texel Rate

The Radeon HD 4890 1GB is much (more or less 117%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 21600 (117%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4890 1GB is superior to the Radeon HD 4830 1GB, by far. (explain)

Radeon HD 4890 1GB 16000 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 6800 (74%)

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 4830 1GB

Amazon.com

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Radeon HD 4890 1GB

Amazon.com

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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 4890 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 Apr 2, 2009
Code Name RV770 LE RV790 XT
Memory 1024 MB 1024 MB
Core Speed 575 MHz 1000 MHz
Memory Speed 1800 MHz 3900 MHz
Power (Max TDP) 95 watts 190 watts
Bandwidth 57600 MB/sec 124800 MB/sec
Texel Rate 18400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 959 million
Bus PCIe 2.0 x16 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 transferred across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines 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 rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 4890 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.

Comments

2 Responses to “Radeon HD 4830 1GB vs Radeon HD 4890 1GB”
df says:

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Henny says:

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