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Radeon HD 4850 512MB vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 4850 512MB has a GPU core speed of 625 MHz, and the 512 MB of GDDR3 memory is set to run at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6450 (OEM), which has GPU core speed of 625 MHz, and 512 MB of GDDR3 RAM set to run at 800 MHz through a 64-bit bus. It also features 160 Stream Processors, 8 Texture Address Units, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 31 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 79 Watts (255%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 512MB should be quite a bit faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon HD 4850 512MB 63552 MB/sec
Radeon HD 6450 (OEM) 12800 MB/sec
Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 512MB is much (more or less 400%) better at AF than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4850 512MB 25000 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 20000 (400%)

Pixel Rate

The Radeon HD 4850 512MB should be much (about 300%) faster with regards to anti-aliasing than the Radeon HD 6450 (OEM), and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4850 512MB 10000 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 7500 (300%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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 512MB Radeon HD 6450 (OEM)
Manufacturer AMD AMD
Year Jun 25, 2008 February 2011
Code Name RV770 PRO Caicos
Memory 512 MB 512 MB
Core Speed 625 MHz 625 MHz
Memory Speed 1986 MHz 1600 MHz
Power (Max TDP) 110 watts 31 watts
Bandwidth 63552 MB/sec 12800 MB/sec
Texel Rate 25000 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 800(160x5) 160
Texture Mapping Units 40 8
Render Output Units 16 4
Bus Type GDDR3 GDDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 956 million 370 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 512MB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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