I'm not a UC expert but i have included two links that i feel should answer your questions. The second link lists the Cisco 7800 Series Media Convergence Servers.
The Cisco Media Convergence Server 7815-I1 provides an entry-level tower server equipped with an Intel Pentium 4 3060 MHz processor, 80GB Serial ATA hard drive, and a single non-hot swap power supply.
None of the UCS hardware uses the pentium 4. I hope this helps. If not the UC community should be able to provide a answer.
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/ps5748/ps378/prod_brochure0900aecd8062a4f9.html
http://www.cisco.com/en/US/products/hw/voiceapp/ps378/index.html
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