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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4850 512MB

Intro

The GeForce 8600 GT 512MB DDR2 makes use of a 80 nm design. nVidia has clocked the core frequency at 540 MHz. The DDR2 RAM works at a frequency of 400 MHz on this particular card. It features 32 SPUs as well as 16 Texture Address Units and 8 Rasterization Operator Units.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 63 Watts (134%)

Memory Bandwidth

The Radeon HD 4850 512MB should in theory be much faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

Radeon HD 4850 512MB 63552 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 512MB is much (more or less 189%) more effective at anisotropic filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4850 512MB 25000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 16360 (189%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4850 512MB is a better choice, and very much so. (explain)

Radeon HD 4850 512MB 10000 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 5680 (131%)

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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GeForce 8600 GT 512MB DDR2

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 GeForce 8600 GT 512MB DDR2 Radeon HD 4850 512MB
Manufacturer nVidia AMD
Year April 2007 Jun 25, 2008
Code Name G84 RV770 PRO
Memory 512 MB 512 MB
Core Speed 540 MHz 625 MHz
Memory Speed 800 MHz 1986 MHz
Power (Max TDP) 47 watts 110 watts
Bandwidth 12800 MB/sec 63552 MB/sec
Texel Rate 8640 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 32 800(160x5)
Texture Mapping Units 16 40
Render Output Units 8 16
Bus Type DDR2 GDDR3
Bus Width 128-bit 256-bit
Fab Process 80 nm 55 nm
Transistors 289 million 956 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of 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

GeForce 8600 GT 512MB DDR2

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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