Mean life time for Server/workstation hardware

We have DELL servers and workstations that have been running for 5 to 6 years now.  I can see the CPU utilization is reaching over 90% lately; although no new softwares were installed.  We tried a fresh installations but the same issue remains.

I would like to propose hardware refreshment to my superiors, but I need justification (Since I am asking to replace over 50 systems).

 Can I get help with the following (supporting documents would be great):
-Is there a mean life time for CPU, motherboard, RAMs and Hardwar in general (especially DELL systems)?
-Is there a recommended replacement guideline for systems that are running 24/7 a year?

Systems are running WIN OS.

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☠ MASQ ☠Commented:
What are your support terms with Dell?
We usually run workstations for 5-6 years maximum as Dell's corporate support only offers a 3+3 or 3+2 year agreement for a 4 hour response - on those terms we get around a 3% critical failure on workstations resulting an warranty replacement over the lifetime of the contract   24/7 servers on tend to get replaced along the same terms.  Although some of the more im;portant systems get the hardware replaced after only 3-4 years but this is based more on fear of failure than anything else!

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hamadqtrAuthor Commented:
The servers are really critical (I meen REALY).  What I want is some kind of supporting documents.
Aaron TomoskySD-WAN SimplifiedCommented:
Just service packs and such for the os will take up more and more CPU and memory. I was brought a laptop running xp with 256 mb or ram. It worked fine back in the day,but with a fresh install of xp sp3 it was already out of memory.
The value comes not from the actual hardware but what software runs on it. Newer server os, virtualization, etc...
Hardware will help if you are getting gigabit nics or teaming them when you couldn't before. Also your apps will run faster if you have databases or something else on the server more than just file storage. You will get more storage space which is why I usually upgrade servers.
If they are really really critical, I say that the lifespan is however long you can still get hardware support from Dell. That's your supporting documentation, along with your plan of what the impact and mitigation you can take for a system that has failed.

If you just want to run a system into the ground, 7 to 10 years is possible (or more) from a hardware perspective, depending on whether or not the load is changing and the hardware/software does what you need it to.  

Good news is that a single server can replace 10 or more through virtualization (depending or the workload). That can save a lot over purchasing replacement servers on a 1 to 1 basis. Downside is that spending on SAN storage for high availability virtualization clusters will eat into a lot of those savings.
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
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