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GeForce 9400 GT 256MB vs Radeon HD 4650 1GB

Intro

The GeForce 9400 GT 256MB makes use of a 65 nm design. nVidia has set the core frequency at 550 MHz. The GDDR2 memory runs at a frequency of 400 MHz on this specific model. It features 16 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 4650 1GB, which features core clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 5 Watts (10%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4650 1GB will be 75% faster than the GeForce 9400 GT 256MB in general, due to its greater data rate. (explain)

Radeon HD 4650 1GB 22400 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 9600 (75%)

Texel Rate

The Radeon HD 4650 1GB is much (more or less 336%) more effective at texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 14800 (336%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4650 1GB is a better choice, and very much so. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 2600 (118%)

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 4650 1GB

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 4650 1GB
Manufacturer nVidia AMD
Year August 2008 Sep 10, 2008
Code Name G96a RV730 PRO
Memory 256 MB 1024 MB
Core Speed 550 MHz 600 MHz
Memory Speed 800 MHz 1400 MHz
Power (Max TDP) 50 watts 55 watts
Bandwidth 12800 MB/sec 22400 MB/sec
Texel Rate 4400 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 16 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type GDDR2 GDDR3
Bus Width 128-bit 128-bit
Fab Process 65 nm 55 nm
Transistors 314 million 514 million
Bus PCIe x16 2.0, PCI PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one 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 graphics card will be at 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 video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Radeon HD 4650 1GB

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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