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GeForce 8500 GT vs Radeon HD 5450

Intro

The GeForce 8500 GT makes use of a 80 nm design. nVidia has clocked the core speed at 450 MHz. The DDR2 memory works at a speed of 400 MHz on this specific card. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 5450, which comes with a 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 is comprised of 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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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 have identical performance. (explain)

Texel Rate

The Radeon HD 5450 should be much (more or less 44%) better at texture filtering 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 lots of anti-aliasing is important to you, then the Radeon HD 5450 is the winner, by far. (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

GeForce 8500 GT

Radeon HD 5450

Specifications

Display 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
Memory 512 MB 512 MB
Core Speed 450 MHz 650 MHz
Memory Speed 800 MHz 1600 MHz
Power (Max TDP) 45 watts 19 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 3600 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 2600 Mpixels/sec
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
Fab Process 80 nm 40 nm
Transistors 210 million 292 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 largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses 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 high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video 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 number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce 8500 GT

Radeon HD 5450

Comments

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

humm nice to know that

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