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GeForce 8500 GT vs GeForce 9400 GT 256MB

Intro

The GeForce 8500 GT has clock speeds of 450 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare all of that to the GeForce 9400 GT 256MB, which makes use of a 65 nm design. nVidia has clocked the core frequency at 550 MHz. The GDDR2 memory is set to run at a frequency of 400 MHz on this model. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT 45 Watts
GeForce 9400 GT 256MB 50 Watts
Difference: 5 Watts (11%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The GeForce 9400 GT 256MB should be quite a bit (more or less 22%) better at texture filtering than the GeForce 8500 GT. (explain)

GeForce 9400 GT 256MB 4400 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 800 (22%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 9400 GT 256MB is superior to the GeForce 8500 GT, by far. (explain)

GeForce 9400 GT 256MB 2200 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 400 (22%)

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 8500 GT

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

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 8500 GT GeForce 9400 GT 256MB
Manufacturer nVidia nVidia
Year April 2007 August 2008
Code Name G86 G96a
Memory 512 MB 256 MB
Core Speed 450 MHz 550 MHz
Memory Speed 800 MHz 800 MHz
Power (Max TDP) 45 watts 50 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 3600 Mtexels/sec 4400 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 2200 Mpixels/sec
Unified Shaders 16 16
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 GDDR2
Bus Width 128-bit 128-bit
Fab Process 80 nm 65 nm
Transistors 210 million 314 million
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe x16 2.0, PCI
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8500 GT

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

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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