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GeForce 8500 GT vs Radeon HD 5450

Intro

The GeForce 8500 GT uses a 80 nm design. nVidia has set the core speed at 450 MHz. The DDR2 RAM runs at a frequency of 400 MHz on this particular card. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 5450, which has a core clock frequency of 650 MHz and a DDR3 memory speed of 800 MHz. It also uses a 64-bit memory bus, and uses a 40 nm design. It features 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce 8500 GT 45 Watts
Difference: 26 Watts (137%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5450 should be much (about 44%) better at AF than the GeForce 8500 GT. (explain)

Radeon HD 5450 5200 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 1600 (44%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 5450 is superior to the GeForce 8500 GT, and very much so. (explain)

Radeon HD 5450 2600 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 800 (44%)

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

Display Prices

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GeForce 8500 GT

Amazon.com

Radeon HD 5450

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 5450
Manufacturer nVidia AMD
Year April 2007 February 4, 2010
Code Name G86 Cedar PRO
Fab Process 80 nm 40 nm
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe 2.1 x16
Memory 512 MB 512 MB
Core Speed 450 MHz 650 MHz
Shader Speed 900 MHz (N/A) MHz
Memory Speed 800 MHz 1600 MHz
Unified Shaders 16 80(16x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 DDR3
Bus Width 128-bit 64-bit
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2
Power (Max TDP) 45 watts 19 watts
Shader Model 4.0 5.0
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 3600 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

One Response to “GeForce 8500 GT vs Radeon HD 5450”
michel says:

humm nice to know that

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