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GeForce 8600 GT 512MB GDDR3 vs Radeon HD 4650 1GB

Intro

The GeForce 8600 GT 512MB GDDR3 comes with a core clock frequency of 540 MHz and a GDDR3 memory speed of 700 MHz. It also uses a 128-bit memory bus, and uses a 80 nm design. It is comprised of 32 SPUs, 16 Texture Address Units, and 8 Raster Operation Units.

Compare those specifications to the Radeon HD 4650 1GB, which has a core clock speed of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB GDDR3 47 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 8 Watts (17%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The Radeon HD 4650 1GB should be much (more or less 122%) more effective at anisotropic filtering than the GeForce 8600 GT 512MB GDDR3. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
GeForce 8600 GT 512MB GDDR3 8640 Mtexels/sec
Difference: 10560 (122%)

Pixel Rate

The Radeon HD 4650 1GB is just a bit (approximately 11%) more effective at full screen anti-aliasing than the GeForce 8600 GT 512MB GDDR3, and also able to handle higher resolutions while still performing well. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
GeForce 8600 GT 512MB GDDR3 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 GDDR3

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 GDDR3 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 1400 MHz 1400 MHz
Power (Max TDP) 47 watts 55 watts
Bandwidth 22400 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 GDDR3 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 information (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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

Display Prices

Hide Prices

GeForce 8600 GT 512MB GDDR3

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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