Unsupported Hardware that works fine?

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I recently purchased a set of ASRock Intel i5 MB/CPU combos for a budget 
compute cluster. Every time we load up a system and try to boot with a 
recent EL6/64 ISO, we get a message that reads:

 > This hardware (or a combination thereof) is not supported by CentOS. 
For more
 > information on supported hardware, plesae refer to 
http://www.centos.org/hardware

Not only does the hardware *seem* to work to expectations, but the url 
referenced goes to 404!

Having loaded CentOS6 on many systems without ever seeing this message, 
I have to ask how to determine what might be triggering it and whether 
or not I should be concerned?

Thanks
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