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

Intro

The GeForce 9800 GT 512MB features core clock speeds of 600 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 112 SPUs as well as 56 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 6450 (OEM) 1GB, which has a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 memory set to run at 900 MHz through a 64-bit bus. It also features 160 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 6450 (OEM) 1GB 31 Watts
GeForce 9800 GT 512MB 105 Watts
Difference: 74 Watts (239%)

Memory Bandwidth

Theoretically, the GeForce 9800 GT 512MB should be quite a bit faster than the Radeon HD 6450 (OEM) 1GB in general. (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 should be much (about 460%) faster with regards to texture 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

If using lots of anti-aliasing is important to you, then the GeForce 9800 GT 512MB is a better choice, and very much so. (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

GeForce 9800 GT 512MB

Amazon.com

Radeon HD 6450 (OEM) 1GB

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 9800 GT 512MB Radeon HD 6450 (OEM) 1GB
Manufacturer nVidia AMD
Year July 2008 February 2011
Code Name G92a/b Caicos
Fab Process 65/55 nm 40 nm
Bus PCIe x16 2.0 PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Shader Speed 1500 MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 900 MHz (3600 MHz effective)
Unified Shaders 112 160
Texture Mapping Units 56 8
Render Output Units 16 4
Bus Type GDDR3 GDDR5
Bus Width 256-bit 64-bit
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 105 watts 31 watts
Shader Model 4.0 5.0
Bandwidth 57600 MB/sec 28800 MB/sec
Texel Rate 33600 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 3000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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 output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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