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GeForce 9800 GT 512MB vs Radeon HD 6450 (OEM) 1GB


The GeForce 9800 GT 512MB makes use of a 65/55 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 memory runs at a frequency of 900 MHz on this specific card. It features 112 SPUs along with 56 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 6450 (OEM) 1GB, which comes with core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
GeForce 9800 GT 512MB 105 Watts
Difference: 74 Watts (239%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GT 512MB should theoretically be much superior to the Radeon HD 6450 (OEM) 1GB overall. (explain)

GeForce 9800 GT 512MB 57600 MB/sec
Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Difference: 28800 (100%)

Texel Rate

The GeForce 9800 GT 512MB will be quite a bit (approximately 460%) more effective at anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

GeForce 9800 GT 512MB 33600 Mtexels/sec
Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Difference: 27600 (460%)

Pixel Rate

The GeForce 9800 GT 512MB should be much (about 220%) more effective at AA than the Radeon HD 6450 (OEM) 1GB, and will be capable of handling higher resolutions better. (explain)

GeForce 9800 GT 512MB 9600 Mpixels/sec
Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Difference: 6600 (220%)

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 9800 GT 512MB

Radeon HD 6450 (OEM) 1GB

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.


Display Specifications

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Model GeForce 9800 GT 512MB Radeon HD 6450 (OEM) 1GB
Manufacturer nVidia AMD
Year July 2008 February 2011
Code Name G92a/b Caicos
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Memory Speed 1800 MHz 3600 MHz
Power (Max TDP) 105 watts 31 watts
Bandwidth 57600 MB/sec 28800 MB/sec
Texel Rate 33600 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 3000 Mpixels/sec
Unified Shaders 112 160
Texture Mapping Units 56 8
Render Output Units 16 4
Bus Type GDDR3 GDDR5
Bus Width 256-bit 64-bit
Fab Process 65/55 nm 40 nm
Transistors 754 million 370 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 are applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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


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