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GeForce 9400 GT 256MB vs Radeon HD 4550 512MB

Intro

The GeForce 9400 GT 256MB makes use of a 65 nm design. nVidia has clocked the core frequency at 550 MHz. The GDDR2 RAM works at a frequency of 400 MHz on this particular card. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

Compare all that to the Radeon HD 4550 512MB, which comes with core clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 RAM. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB 25 Watts
GeForce 9400 GT 256MB 50 Watts
Difference: 25 Watts (100%)

Memory Bandwidth

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

Texel Rate

The Radeon HD 4550 512MB will be a bit (more or less 9%) better at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 4550 512MB 4800 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 400 (9%)

Pixel Rate

The Radeon HD 4550 512MB will be just a bit (more or less 9%) more effective at full screen anti-aliasing than the GeForce 9400 GT 256MB, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4550 512MB 2400 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 200 (9%)

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 9400 GT 256MB

Amazon.com

Check prices at:

Radeon HD 4550 512MB

Amazon.com

Check prices at:

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

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Model GeForce 9400 GT 256MB Radeon HD 4550 512MB
Manufacturer nVidia AMD
Year August 2008 Sep 30, 2008
Code Name G96a RV710
Memory 256 MB 512 MB
Core Speed 550 MHz 600 MHz
Memory Speed 800 MHz 1600 MHz
Power (Max TDP) 50 watts 25 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 4400 Mtexels/sec 4800 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 2400 Mpixels/sec
Unified Shaders 16 80(16x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type GDDR2 GDDR3
Bus Width 128-bit 64-bit
Fab Process 65 nm 55 nm
Transistors 314 million 242 million
Bus PCIe x16 2.0, PCI PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Radeon HD 4550 512MB

Amazon.com

Check prices at:

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.

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