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GeForce 8600 GT 512MB DDR2 vs GeForce GT 420

Intro

The GeForce 8600 GT 512MB DDR2 has a GPU clock speed of 540 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 128-bit bus. It also is comprised of 32 Stream Processors, 16 TAUs, and 8 Raster Operation Units.

Compare those specs to the GeForce GT 420, which has GPU core speed of 700 MHz, and 2048 MB of GDDR3 RAM set to run at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
GeForce GT 420 50 Watts
Difference: 3 Watts (6%)

Memory Bandwidth

The GeForce GT 420 should theoretically be a lot faster than the GeForce 8600 GT 512MB DDR2 in general. (explain)

GeForce GT 420 28800 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 16000 (125%)

Texel Rate

The GeForce 8600 GT 512MB DDR2 is quite a bit (more or less 54%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 3040 (54%)

Pixel Rate

The GeForce 8600 GT 512MB DDR2 will be a lot (more or less 54%) more effective at AA than the GeForce GT 420, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 1520 (54%)

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:

GeForce GT 420

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 GeForce GT 420
Manufacturer nVidia nVidia
Year April 2007 September 2010
Code Name G84 GF108
Memory 512 MB 2048 MB
Core Speed 540 MHz 700 MHz
Memory Speed 800 MHz 1800 MHz
Power (Max TDP) 47 watts 50 watts
Bandwidth 12800 MB/sec 28800 MB/sec
Texel Rate 8640 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 32 48
Texture Mapping Units 16 8
Render Output Units 8 4
Bus Type DDR2 GDDR3
Bus Width 128-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 289 million 585 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount 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 outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

GeForce GT 420

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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