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

Intro

The GeForce 8600 GT 256MB GDDR3 has a GPU core clock speed of 540 MHz, and the 256 MB of GDDR3 memory is set to run at 700 MHz through a 128-bit bus. It also features 32 Stream Processors, 16 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 3650 512MB, which comes with a clock speed of 725 MHz and a GDDR3 memory frequency of 800 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It is comprised of 120(24x5) SPUs, 8 TAUs, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon HD 3650 512MB, in theory, should perform a small bit faster than the GeForce 8600 GT 256MB GDDR3 overall. (explain)

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

Texel Rate

The GeForce 8600 GT 256MB GDDR3 is quite a bit (approximately 49%) faster with regards to texture filtering than the Radeon HD 3650 512MB. (explain)

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

Pixel Rate

The GeForce 8600 GT 256MB GDDR3 will be a lot (more or less 49%) faster with regards to AA than the Radeon HD 3650 512MB, and also capable of handling higher resolutions while still performing well. (explain)

GeForce 8600 GT 256MB GDDR3 4320 Mpixels/sec
Radeon HD 3650 512MB 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

Check prices at:

Radeon HD 3650 512MB

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 256MB GDDR3 Radeon HD 3650 512MB
Manufacturer nVidia AMD
Year April 2007 2008
Code Name G84 RV635 PRO
Memory 256 MB 512 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 GDDR3
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: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 256MB GDDR3

Amazon.com

Check prices at:

Radeon HD 3650 512MB

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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