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GeForce 8600 GTS vs GeForce GTS 250 1GB

Intro

The GeForce 8600 GTS comes with core clock speeds of 675 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 RAM. It features 32 SPUs as well as 16 TAUs and 8 Rasterization Operator Units.

Compare those specs to the GeForce GTS 250 1GB, which comes with GPU core speed of 738 MHz, and 1024 MB of GDDR3 RAM set to run at 1100 MHz through a 256-bit bus. It also is made up of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GTS 75 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 70 Watts (93%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB should be 120% faster than the GeForce 8600 GTS in general, due to its greater data rate. (explain)

GeForce GTS 250 1GB 70400 MB/sec
GeForce 8600 GTS 32000 MB/sec
Difference: 38400 (120%)

Texel Rate

The GeForce GTS 250 1GB is much (more or less 337%) more effective at anisotropic filtering than the GeForce 8600 GTS. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
GeForce 8600 GTS 10800 Mtexels/sec
Difference: 36432 (337%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTS 250 1GB is a better choice, and very much so. (explain)

GeForce GTS 250 1GB 11808 Mpixels/sec
GeForce 8600 GTS 5400 Mpixels/sec
Difference: 6408 (119%)

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

GeForce GTS 250 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

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Model GeForce 8600 GTS GeForce GTS 250 1GB
Manufacturer nVidia nVidia
Year April 2007 March 3, 2009
Code Name G84 G92a/b
Memory 512 MB 1024 MB
Core Speed 675 MHz 738 MHz
Memory Speed 2000 MHz 2200 MHz
Power (Max TDP) 75 watts 145 watts
Bandwidth 32000 MB/sec 70400 MB/sec
Texel Rate 10800 Mtexels/sec 47232 Mtexels/sec
Pixel Rate 5400 Mpixels/sec 11808 Mpixels/sec
Unified Shaders 32 128
Texture Mapping Units 16 64
Render Output Units 8 16
Bus Type GDDR3 GDDR3
Bus Width 128-bit 256-bit
Fab Process 80 nm 65/55 nm
Transistors 289 million 754 million
Bus PCIe x16 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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