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GeForce 8600 GT 1GB GDDR3 vs Radeon HD 7870 XT

Intro

The GeForce 8600 GT 1GB GDDR3 has a core clock speed of 540 MHz and a GDDR3 memory frequency of 700 MHz. It also features a 128-bit bus, and makes use of a 80 nm design. It features 32 SPUs, 16 Texture Address Units, and 8 ROPs.

Compare all of that to the Radeon HD 7870 XT, which comes with a core clock speed of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 1GB GDDR3 47 Watts
Radeon HD 7870 XT 185 Watts
Difference: 138 Watts (294%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 XT should in theory be quite a bit superior to the GeForce 8600 GT 1GB GDDR3 in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
GeForce 8600 GT 1GB GDDR3 22400 MB/sec
Difference: 169600 (757%)

Texel Rate

The Radeon HD 7870 XT will be much (approximately 928%) more effective at texture filtering than the GeForce 8600 GT 1GB GDDR3. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
GeForce 8600 GT 1GB GDDR3 8640 Mtexels/sec
Difference: 80160 (928%)

Pixel Rate

The Radeon HD 7870 XT is quite a bit (more or less 585%) faster with regards to AA than the GeForce 8600 GT 1GB GDDR3, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
GeForce 8600 GT 1GB GDDR3 4320 Mpixels/sec
Difference: 25280 (585%)

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 1GB GDDR3

Amazon.com

Check prices at:

Radeon HD 7870 XT

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 1GB GDDR3 Radeon HD 7870 XT
Manufacturer nVidia AMD
Year April 2007 November 2012
Code Name G84 Tahiti LE
Memory 1024 MB 2048 MB
Core Speed 540 MHz 925 MHz
Memory Speed 1400 MHz 6000 MHz
Power (Max TDP) 47 watts 185 watts
Bandwidth 22400 MB/sec 192000 MB/sec
Texel Rate 8640 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 32 1536
Texture Mapping Units 16 96
Render Output Units 8 32
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 80 nm 28 nm
Transistors 289 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher 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 maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 1GB GDDR3

Amazon.com

Check prices at:

Radeon HD 7870 XT

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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