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GeForce 8600 GT 256MB GDDR3 vs GeForce GT 430 1GB

Intro

The GeForce 8600 GT 256MB GDDR3 comes with a clock speed of 540 MHz and a GDDR3 memory speed of 700 MHz. It also features a 128-bit bus, and uses a 80 nm design. It is comprised of 32 SPUs, 16 TAUs, and 8 Raster Operation Units.

Compare that to the GeForce GT 430 1GB, which makes use of a 40 nm design. nVidia has clocked the core speed at 700 MHz. The GDDR3 RAM is set to run at a frequency of 900 MHz on this particular model. It features 96 SPUs along with 16 Texture Address Units and 4 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 256MB GDDR3 47 Watts
GeForce GT 430 1GB 60 Watts
Difference: 13 Watts (28%)

Memory Bandwidth

In theory, the GeForce GT 430 1GB should be 29% quicker than the GeForce 8600 GT 256MB GDDR3 overall, because of its higher bandwidth. (explain)

GeForce GT 430 1GB 28800 MB/sec
GeForce 8600 GT 256MB GDDR3 22400 MB/sec
Difference: 6400 (29%)

Texel Rate

The GeForce GT 430 1GB should be a lot (approximately 30%) better at anisotropic filtering than the GeForce 8600 GT 256MB GDDR3. (explain)

GeForce GT 430 1GB 11200 Mtexels/sec
GeForce 8600 GT 256MB GDDR3 8640 Mtexels/sec
Difference: 2560 (30%)

Pixel Rate

The GeForce 8600 GT 256MB GDDR3 is a lot (approximately 54%) more effective at FSAA than the GeForce GT 430 1GB, and able to handle higher resolutions without slowing down too much. (explain)

GeForce 8600 GT 256MB GDDR3 4320 Mpixels/sec
GeForce GT 430 1GB 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

GeForce 8600 GT 256MB GDDR3

Amazon.com

GeForce GT 430 1GB

Amazon.com

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

Model GeForce 8600 GT 256MB GDDR3 GeForce GT 430 1GB
Manufacturer nVidia nVidia
Year April 2007 October 2010
Code Name G84 GF108
Fab Process 80 nm 40 nm
Bus PCIe x16 PCIe x16
Memory 256 MB 1024 MB
Core Speed 540 MHz 700 MHz
Shader Speed 1180 MHz 1400 MHz
Memory Speed 700 MHz (1400 MHz effective) 900 MHz (1800 MHz effective)
Unified Shaders 32 96
Texture Mapping Units 16 16
Render Output Units 8 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 47 watts 60 watts
Shader Model 4.0 5.0
Bandwidth 22400 MB/sec 28800 MB/sec
Texel Rate 8640 Mtexels/sec 11200 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 2800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

One Response to “GeForce 8600 GT 256MB GDDR3 vs GeForce GT 430 1GB”
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