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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4650 1GB

Intro

The GeForce 8600 GT 512MB DDR2 has core speeds of 540 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 32 SPUs as well as 16 Texture Address Units and 8 ROPs.

Compare that to the Radeon HD 4650 1GB, which features GPU core speed of 600 MHz, and 1024 MB of GDDR3 RAM set to run at 700 MHz through a 128-bit bus. It also features 320(64x5) Stream Processors, 32 TAUs, and 8 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 4650 1GB 55 Watts
Difference: 8 Watts (17%)

Memory Bandwidth

Performance-wise, the Radeon HD 4650 1GB should theoretically be much better than the GeForce 8600 GT 512MB DDR2 in general. (explain)

Radeon HD 4650 1GB 22400 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 9600 (75%)

Texel Rate

The Radeon HD 4650 1GB is much (approximately 122%) faster with regards to AF than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 10560 (122%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4650 1GB is a better choice, though only just barely. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 480 (11%)

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 4650 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 4650 1GB
Manufacturer nVidia AMD
Year April 2007 Sep 10, 2008
Code Name G84 RV730 PRO
Memory 512 MB 1024 MB
Core Speed 540 MHz 600 MHz
Memory Speed 800 MHz 1400 MHz
Power (Max TDP) 47 watts 55 watts
Bandwidth 12800 MB/sec 22400 MB/sec
Texel Rate 8640 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 32 320(64x5)
Texture Mapping Units 16 32
Render Output Units 8 8
Bus Type DDR2 GDDR3
Bus Width 128-bit 128-bit
Fab Process 80 nm 55 nm
Transistors 289 million 514 million
Bus PCIe x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4650 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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