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

Intro

The GeForce 8600 GT 256MB GDDR3 has a core clock speed of 540 MHz and a GDDR3 memory frequency of 700 MHz. It also features a 128-bit memory bus, and uses a 80 nm design. It features 32 SPUs, 16 TAUs, and 8 ROPs.

Compare those specifications to the Radeon HD 3650 256MB, which features GPU clock speed of 725 MHz, and 256 MB of DDR2 memory running at 800 MHz through a 128-bit bus. It also is made up of 120(24x5) Stream Processors, 8 TAUs, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the Radeon HD 3650 256MB should in theory be just a bit superior to the GeForce 8600 GT 256MB GDDR3 overall. (explain)

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

Texel Rate

The GeForce 8600 GT 256MB GDDR3 will be a lot (more or less 49%) faster with regards to texture filtering than the Radeon HD 3650 256MB. (explain)

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

Pixel Rate

The GeForce 8600 GT 256MB GDDR3 is quite a bit (approximately 49%) more effective at full screen anti-aliasing than the Radeon HD 3650 256MB, and should be capable of handling higher resolutions more effectively. (explain)

GeForce 8600 GT 256MB 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 256MB GDDR3

Amazon.com

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Radeon HD 3650 256MB

Amazon.com

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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 256MB GDDR3 Radeon HD 3650 256MB
Manufacturer nVidia AMD
Year April 2007 2008
Code Name G84 RV635 PRO
Memory 256 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 largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 per second. This figure is calculated 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 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 most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8600 GT 256MB 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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