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GeForce 8600 GT 512MB GDDR3 vs Radeon HD 3650 256MB

Intro

The GeForce 8600 GT 512MB GDDR3 uses a 80 nm design. nVidia has set the core speed at 540 MHz. The GDDR3 memory runs at a speed of 700 MHz on this particular model. It features 32 SPUs along with 16 TAUs and 8 Rasterization Operator Units.

Compare those specs to the Radeon HD 3650 256MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 725 MHz. The DDR2 RAM works at a frequency of 800 MHz on this specific card. It features 120(24x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB GDDR3 47 Watts
Radeon HD 3650 256MB 78 Watts
Difference: 31 Watts (66%)

Memory Bandwidth

In theory, the Radeon HD 3650 256MB should be 14% quicker than the GeForce 8600 GT 512MB GDDR3 overall, due to its higher bandwidth. (explain)

Radeon HD 3650 256MB 25600 MB/sec
GeForce 8600 GT 512MB GDDR3 22400 MB/sec
Difference: 3200 (14%)

Texel Rate

The GeForce 8600 GT 512MB GDDR3 will be quite a bit (more or less 49%) more effective at AF than the Radeon HD 3650 256MB. (explain)

GeForce 8600 GT 512MB GDDR3 8640 Mtexels/sec
Radeon HD 3650 256MB 5800 Mtexels/sec
Difference: 2840 (49%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 8600 GT 512MB GDDR3 is the winner, and very much so. (explain)

GeForce 8600 GT 512MB GDDR3 4320 Mpixels/sec
Radeon HD 3650 256MB 2900 Mpixels/sec
Difference: 1420 (49%)

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 3650 256MB

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 3650 256MB
Manufacturer nVidia AMD
Year April 2007 2008
Code Name G84 RV635 PRO
Memory 512 MB 256 MB
Core Speed 540 MHz 725 MHz
Memory Speed 1400 MHz 1600 MHz
Power (Max TDP) 47 watts 78 watts
Bandwidth 22400 MB/sec 25600 MB/sec
Texel Rate 8640 Mtexels/sec 5800 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 2900 Mpixels/sec
Unified Shaders 32 120(24x5)
Texture Mapping Units 16 8
Render Output Units 8 4
Bus Type GDDR3 DDR2
Bus Width 128-bit 128-bit
Fab Process 80 nm 55 nm
Transistors 289 million (Unknown) 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 MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 are processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a 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 - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB GDDR3

Amazon.com

Check prices at:

Radeon HD 3650 256MB

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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