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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4850 1GB

Intro

The GeForce 8600 GT 512MB DDR2 has a GPU core speed of 540 MHz, and the 512 MB of DDR2 memory is set to run at 400 MHz through a 128-bit bus. It also is made up of 32 Stream Processors, 16 TAUs, and 8 ROPs.

Compare those specifications to the Radeon HD 4850 1GB, which features GPU clock speed of 625 MHz, and 1024 MB of GDDR4 memory running at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 63 Watts (134%)

Memory Bandwidth

Theoretically, the Radeon HD 4850 1GB should be a lot faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

Radeon HD 4850 1GB 63552 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 1GB is a lot (approximately 189%) more effective at anisotropic filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 16360 (189%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 1GB is superior to the GeForce 8600 GT 512MB DDR2, by a large margin. (explain)

Radeon HD 4850 1GB 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

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Radeon HD 4850 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 GeForce 8600 GT 512MB DDR2 Radeon HD 4850 1GB
Manufacturer nVidia AMD
Year April 2007 Jun 25, 2008
Code Name G84 RV770 PRO
Memory 512 MB 1024 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 GDDR4
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 max amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, 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 most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4850 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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