When you have this error message in the BIOS '19a - voltage mismatched', this is because you have a non-refresh board. It will never go this error message as the non-refresh is not meant to work with 45nm processors, they work only with 65nm. So unfortunately, there is no fix for this. At least your one is working, in some cases it does not boot at all.
Even upgrading the bios, it wont make the error message disappear.
One thing only to be 100% sure, check the pba number of the your board if it is non-refresh board and if your cpu is 45 nm. Other than this, i dont have any suggestions.
Refresh board has a 'R' at the end.
Useful website to check:
This is what i get from lavalys everest
Motherboard ID 63-0100-000001-00101111-092308-Chipset$0AAAA000_BIOS DATE: 09/23/08 12:19:37 VER: 08.00.10
Motherboard Name Intel Vernonia S5000XVN
Front Side Bus Properties:
Bus Type Intel AGTL+
Bus Width 64-bit
Real Clock 333 MHz (QDR)
Effective Clock 1333 MHz
Bandwidth 10667 MB/s
Memory Bus Properties:
Bus Type Quad DDR2 SDRAM
Bus Width 256-bit
DRAM:FSB Ratio 1:1
Real Clock 333 MHz (DDR)
Effective Clock 667 MHz
Bandwidth 21333 MB/s
Motherboard Physical Info:
CPU Sockets/Slots 2 LGA771
Expansion Slots 2 PCI-E x8, 1 PCI-E x16, 2 PCI-X
RAM Slots 8 FB-DIMM
Integrated Devices Audio, Dual LAN
Form Factor Extended ATX
Motherboard Chipset i5000X
Chech your board and you should see a small white label with barcode on it. There should be a PBA # in 6 digits - dash - 3 digits format. If it's E11034-xxx or E11030-xxx then your board supports Xeon 5400 series. Otherwise your hardware doesn't support the processor.
I did look at that list but apparently not close enough. So what i need is a S5000XVN with a R at the end, aka the S5000XVNSATAR? I wish intel would have been a bit clearer in that case.