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GeForce 8500 GT vs Radeon HD 5770

Intro

The GeForce 8500 GT features a core clock frequency of 450 MHz and a DDR2 memory frequency of 400 MHz. It also makes use of a 128-bit memory bus, and uses a 80 nm design. It is made up of 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 5770, which features GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT 45 Watts
Radeon HD 5770 108 Watts
Difference: 63 Watts (140%)

Memory Bandwidth

In theory, the Radeon HD 5770 is 500% quicker than the GeForce 8500 GT overall, because of its higher bandwidth. (explain)

Radeon HD 5770 76800 MB/sec
GeForce 8500 GT 12800 MB/sec
Difference: 64000 (500%)

Texel Rate

The Radeon HD 5770 should be quite a bit (more or less 844%) more effective at AF than the GeForce 8500 GT. (explain)

Radeon HD 5770 34000 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 30400 (844%)

Pixel Rate

The Radeon HD 5770 will be much (more or less 656%) more effective at FSAA than the GeForce 8500 GT, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 5770 13600 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 11800 (656%)

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 8500 GT

Amazon.com

Radeon HD 5770

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 8500 GT Radeon HD 5770
Manufacturer nVidia AMD
Year April 2007 October 13, 2009
Code Name G86 Juniper XT
Memory 512 MB 1024 MB
Core Speed 450 MHz 850 MHz
Memory Speed 800 MHz 4800 MHz
Power (Max TDP) 45 watts 108 watts
Bandwidth 12800 MB/sec 76800 MB/sec
Texel Rate 3600 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 16 800(160x5)
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 210 million 1040 million
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses 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 figure is worked out by multiplying the total amount of texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends 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.

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