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GeForce 9400 GT 256MB vs Radeon HD 4550 512MB

Intro

The GeForce 9400 GT 256MB features a clock speed of 550 MHz and a GDDR2 memory speed of 400 MHz. It also features a 128-bit memory bus, and uses a 65 nm design. It features 16 SPUs, 8 TAUs, and 4 ROPs.

Compare that to the Radeon HD 4550 512MB, which makes use of a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 memory is set to run at a speed of 800 MHz on this particular card. It features 80(16x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

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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 identical performance. (explain)

Texel Rate

The Radeon HD 4550 512MB should be just a bit (more or less 9%) more effective at texture 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 is a bit (approximately 9%) more effective at AA than the GeForce 9400 GT 256MB, and also will be able to handle higher screen resolutions better. (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: Bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory 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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