something doesn't seem right. the /proc/cpuinfo normally shows the property 'model name' as a string which identifies the processor as in Intel(R) Xeon(R) CPU E5320 @ 1.86GHz or whatever. unless the motherboard is not with an up-to-date bios and its not recognizing the cpu properly.
There isn't a proper list which contains all the model, family, stepping and all that.
CPU ID utilities (such as the Intel one, or CPUZ) just read the model name string and display that.
I've seen situations where cpuz just returns the string you are seeing Genuine Intel(R) and then the speed.
To determine the detailed processor name via software, you can use the bootable version of the Intel® Processor Identification Utility. The bootable version is recommended for non-Windows* based operating systems.
Intel Customer Support
* Other names and brands may be claimed as the property of others.
Thanks to everyone for their suggestions; the servers are remote from me and also in constant use, so rebooting to use the standalone tool isn't really an option at this point. I'm a bit surprised to find that there's no canonical "conversion chart" from a family & model to a marketing-style name, but that's the breaks. I think we're close enough with the other specs which are evident from other fields (ie, the cache size, clock freqs, number of CPUs, etc...) - if I do get the chance to reboot and try the standalone tool in the future I'll try to remember to come back and update the thread.