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GeForce 8500 GT vs Radeon HD 5450

Intro

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

Compare all that to the Radeon HD 5450, which has GPU core speed of 650 MHz, and 512 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also features 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

(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 exactly the same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 5450 should be a lot (about 44%) faster with regards to 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 using lots of anti-aliasing is important to you, then the Radeon HD 5450 is a better choice, by a large margin. (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

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

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 400 MHz (800 MHz effective) 800 MHz (1600 MHz effective)
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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach 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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