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GeForce 8600 GT 512MB DDR2 vs GeForce GT 315

Intro

The GeForce 8600 GT 512MB DDR2 uses a 80 nm design. nVidia has clocked the core speed at 540 MHz. The DDR2 memory is set to run at a frequency of 400 MHz on this specific model. It features 32 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all of that to the GeForce GT 315, which features GPU clock speed of 625 MHz, and 512 MB of DDR3 memory running at 790 MHz through a 128-bit bus. It also is made up of 48 SPUs, 16 Texture Address Units, and 8 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 315 52 Watts
Difference: 5 Watts (11%)

Memory Bandwidth

Theoretically, the GeForce GT 315 should perform quite a bit faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

GeForce GT 315 25280 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 12480 (98%)

Texel Rate

The GeForce GT 315 should be a small bit (more or less 16%) better at AF than the GeForce 8600 GT 512MB DDR2. (explain)

GeForce GT 315 10000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 1360 (16%)

Pixel Rate

The GeForce GT 315 will be a bit (approximately 16%) more effective at AA than the GeForce 8600 GT 512MB DDR2, and able to handle higher resolutions while still performing well. (explain)

GeForce GT 315 5000 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 680 (16%)

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

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GeForce GT 315

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 315
Manufacturer nVidia nVidia
Year April 2007 November 2009
Code Name G84 GT216
Memory 512 MB 512 MB
Core Speed 540 MHz 625 MHz
Memory Speed 800 MHz 1580 MHz
Power (Max TDP) 47 watts 52 watts
Bandwidth 12800 MB/sec 25280 MB/sec
Texel Rate 8640 Mtexels/sec 10000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 5000 Mpixels/sec
Unified Shaders 32 48
Texture Mapping Units 16 16
Render Output Units 8 8
Bus Type DDR2 DDR3
Bus Width 128-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 289 million 486 million
Bus PCIe x16 PCIe 2.0
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.2

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

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential 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 315

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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