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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4770

Intro

The GeForce 8600 GT 512MB DDR2 has a GPU clock speed of 540 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 128-bit bus. It also is made up of 32 SPUs, 16 TAUs, and 8 ROPs.

Compare that to the Radeon HD 4770, which uses a 40 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM works at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 4770 80 Watts
Difference: 33 Watts (70%)

Memory Bandwidth

The Radeon HD 4770 should theoretically perform quite a bit faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

Radeon HD 4770 51200 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 38400 (300%)

Texel Rate

The Radeon HD 4770 will be a lot (approximately 178%) faster with regards to texture filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4770 24000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 15360 (178%)

Pixel Rate

The Radeon HD 4770 will be quite a bit (more or less 178%) faster with regards to full screen anti-aliasing than the GeForce 8600 GT 512MB DDR2, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 4770 12000 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 7680 (178%)

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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Radeon HD 4770

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 Radeon HD 4770
Manufacturer nVidia AMD
Year April 2007 Apr 28, 2009
Code Name G84 RV740
Memory 512 MB 512 MB
Core Speed 540 MHz 750 MHz
Memory Speed 800 MHz 3200 MHz
Power (Max TDP) 47 watts 80 watts
Bandwidth 12800 MB/sec 51200 MB/sec
Texel Rate 8640 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 32 640(128x5)
Texture Mapping Units 16 32
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 289 million 826 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4770

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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