I don't know why others would be having these issues, but also I noticed that my bootrom is different than everyone elses: Mine is a B08 where as the last firmware update for the mac pros of 2009 is B06 OR B07.. Could it be... that the B08 is allowing me to do this?
As I mentioned before, you may actually be a test subject with it (part of the validation testing). But if it wasn't specifically stated, you're not aware of it (i.e. general window about sending report data, without any specific mention/information on what's sent).
That's the range of voltage, it doesn't mean that they will be using the same voltage when in use.
Voltages are set in the board's firmware (controls the voltage regulators). So the VID is the same for whatever part that's in it (assuming it meets specs otherwise, such as the correct steppings).
OC capable boards usually allow for voltage adjustments (user accessible settings). Otherwise they're fixed.
If your machine isn't using Xeons, it's certainly not equivalent to the Mac Pro. You can argue this out and claim the uselessness of Xeons until the cows come home, but no build is "equivalent" without them.
From a purely technical POV, they're not. Just really close.
Where the issue for many comes in, is the fact that most users don't actually need ECC. In those cases, they can't but help notice the price differences in the
retail market. In the component markets though, the prices are the same on Intel's published Quantity Price List, so the cost is theoretically the same (variations do actually occur, depending on the exact procurement method used, which is based on quantity purchased).
That having been said, I'm now curious as to total cost of an actual mostly equivalent build (Rominator's point about the motherboard) that is an actual Xeon system. You'd also need the kilowatt power supply, four PCIe slots, etc. I guess substituting a card for ports like firewire 800 would be acceptable, as I'm not sure how many motherboards carry them.
As in Xeon and ECC? Or i7's and non ECC?
In either situation, the PSU and case alone can be reduced spec wise to make a noticeable difference in price. BTW, the PSU rating in the MP is peak power (extremely common BTW), not continuous. So for a decent continuous rated unit, you'd only need to be looking at a 700W model, not a 1kW unit.
Just in case you get bored and take the time to cost out such a system/s.
So the W5590 3.33GHz Xeon processor would work as a processor upgrade for an Early 2009 model Mac Pro?
If you have an Octad (Dual Processor) system, then the W5590 would work. Actually, it would work in the Quad as well, but is a waste of money, as the second QPI channel can't be used, and pushes the cost of the processor.
If the system is a Quad, then the W3580 would be the better choice, as it's quite a bit cheaper as you found out.
