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Radeon HD 4850 2GB vs Radeon HD 4850 512MB

Intro

The Radeon HD 4850 2GB uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR4 RAM works at a speed of 993 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 4850 512MB, which features a clock frequency of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should perform the same. (explain)

Texel Rate

Both cards have exactly the same texel fill rate, so theoretically they should perform equally good at at AF. (explain)

Pixel Rate

Both cards have exactly the same pixel rate, so theoretically they should be equally good at at FSAA, and be capable of handling the same resolutions. (explain)

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 4850 2GB

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 4850 2GB Radeon HD 4850 512MB
Manufacturer AMD AMD
Year Jun 25, 2008 Jun 25, 2008
Code Name RV770 PRO RV770 PRO
Memory 2048 MB 512 MB
Core Speed 625 MHz 625 MHz
Memory Speed 1986 MHz 1986 MHz
Power (Max TDP) 110 watts 110 watts
Bandwidth 63552 MB/sec 63552 MB/sec
Texel Rate 25000 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5)
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR4 GDDR3
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 956 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 largest amount of information (counted in MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 2GB

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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