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GeForce 8600 GS (OEM) vs Radeon HD 5450

Intro

The GeForce 8600 GS (OEM) uses a 80 nm design. nVidia has clocked the core frequency at 540 MHz. The DDR2 memory runs at a frequency of 400 MHz on this particular card. It features 32 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the Radeon HD 5450, which has a GPU core clock speed of 650 MHz, and 512 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) Stream Processors, 8 Texture Address Units, 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 8600 GS (OEM) 47 Watts
Difference: 28 Watts (147%)

Memory Bandwidth

Both cards have the exact same bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The GeForce 8600 GS (OEM) should be a lot (about 66%) better at AF than the Radeon HD 5450. (explain)

GeForce 8600 GS (OEM) 8640 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 3440 (66%)

Pixel Rate

The GeForce 8600 GS (OEM) is much (about 66%) better at anti-aliasing than the Radeon HD 5450, and also will be capable of handling higher resolutions while still performing well. (explain)

GeForce 8600 GS (OEM) 4320 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 1720 (66%)

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 8600 GS (OEM)

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 8600 GS (OEM) Radeon HD 5450
Manufacturer nVidia AMD
Year April 2007 February 4, 2010
Code Name G84 Cedar PRO
Fab Process 80 nm 40 nm
Bus PCIe x16 PCIe 2.1 x16
Memory 256 MB 512 MB
Core Speed 540 MHz 650 MHz
Shader Speed 1180 MHz (N/A) MHz
Memory Speed 400 MHz (800 MHz effective) 800 MHz (1600 MHz effective)
Unified Shaders 32 80(16x5)
Texture Mapping Units 16 8
Render Output Units 8 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) 47 watts 19 watts
Shader Model 4.0 5.0
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 8640 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 are processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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