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GeForce 8600 GTS vs GeForce GT 420

Intro

The GeForce 8600 GTS uses a 80 nm design. nVidia has clocked the core speed at 675 MHz. The GDDR3 RAM works at a speed of 1000 MHz on this particular card. It features 32 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Compare that to the GeForce GT 420, which comes with GPU core speed of 700 MHz, and 2048 MB of GDDR3 RAM running at 900 MHz through a 128-bit bus. It also is made up of 48 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce 8600 GTS 75 Watts
Difference: 25 Watts (50%)

Memory Bandwidth

In theory, the GeForce 8600 GTS should perform just a bit faster than the GeForce GT 420 in general. (explain)

GeForce 8600 GTS 32000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 3200 (11%)

Texel Rate

The GeForce 8600 GTS is quite a bit (about 93%) better at AF than the GeForce GT 420. (explain)

GeForce 8600 GTS 10800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 5200 (93%)

Pixel Rate

The GeForce 8600 GTS should be much (approximately 93%) more effective at anti-aliasing than the GeForce GT 420, and should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce 8600 GTS 5400 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 2600 (93%)

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 GTS

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 GTS GeForce GT 420
Manufacturer nVidia nVidia
Year April 2007 September 2010
Code Name G84 GF108
Memory 512 MB 2048 MB
Core Speed 675 MHz 700 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 75 watts 50 watts
Bandwidth 32000 MB/sec 28800 MB/sec
Texel Rate 10800 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 5400 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 32 48
Texture Mapping Units 16 8
Render Output Units 8 4
Bus Type GDDR3 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 max amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units by the core clock 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 most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GTS

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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