They need to be in matching pairs. If they work individually, it's likely that the slight variation in spec is what's preventing the system from booting.
A match means exactly that. The specs you've provided above aren't a match, even though the variations appear to be minor. Apart from the voltages being different, the significant difference is the stepping (i.e. revision of CPU). You've identified two different revision CPUs, hence they are not matched.
There is more than just the ID. Intel has a utility to determine what CPUs you have. You can download it here, install it and run it to determine the CPU information. Run it on both CPUs and look at the CPUID data. The CPU Family and Stepping have to match. It's possible the CPU Revision may have to match as well.
Make sure you're BIOS and any RAID firmware are the latest versions. If you have another single CPU 1400SC that was bought around the same time as this one, swap the second CPU with the other 1400SC's single CPU. That way, there's more of a chance the the CPUs will be identical.
If this doesn't work, there might be something wrong with the 2nd CPU socket or VRM slot. It could be general dirt too. Make sure there's no dust trapped in the CPU socket or VRM slot. If the CPU socket has been sitting exposed you might want to blow it out. You can probably wiggle the VRM board to make sure it's making good contact.
In a former life we had the brilliant idea to buy a dozen CPU chips and upgrade the rack of single proc servers to dual CPU. After a bunch of trial and error we ended up removing the old CPUs and pairing them together in a single server and installing new CPUs in the remaining servers. I'm glad we had an even number of servers.
Now THIS is helpful! My RAID is after-market Adaptec 2120S, so I suspect its not part of the formula. But my luck with CPUs has been bad and this will explain it!
Is there anyway to determine these factors from the chip itself? If I am going to buy a chip on ebay, do I need the seller to run this app to determine a match?
Sorry, I missed the utility was only for the P4 family. In the notes there's reference to the Processor Frequency ID Utility here. That one appears to support the Pentium III chips.
Unfortunately, I don't have any of the servers available anymore to test this. Try it on the two CPUs you have and see what they say. Does is show any differences between the two chips?
I don't think the RAID controller has any affect on the CPU support.
snapohead
1.2K Posts
0
March 27th, 2008 21:00
They need to be in matching pairs. If they work individually, it's likely that the slight variation in spec is what's preventing the system from booting.
rayeifler
5 Posts
0
March 28th, 2008 00:00
snapohead
1.2K Posts
0
March 28th, 2008 04:00
rayeifler
5 Posts
0
March 28th, 2008 14:00
Is the SL4C8 enough of a designation match? If I have two SL4C8 chips is that a match? Or is there even more criteria I need to identify?
Thanks for the help
jcn77056
667 Posts
0
March 29th, 2008 01:00
There is more than just the ID. Intel has a utility to determine what CPUs you have. You can download it here, install it and run it to determine the CPU information. Run it on both CPUs and look at the CPUID data. The CPU Family and Stepping have to match. It's possible the CPU Revision may have to match as well.
Make sure you're BIOS and any RAID firmware are the latest versions. If you have another single CPU 1400SC that was bought around the same time as this one, swap the second CPU with the other 1400SC's single CPU. That way, there's more of a chance the the CPUs will be identical.
If this doesn't work, there might be something wrong with the 2nd CPU socket or VRM slot. It could be general dirt too. Make sure there's no dust trapped in the CPU socket or VRM slot. If the CPU socket has been sitting exposed you might want to blow it out. You can probably wiggle the VRM board to make sure it's making good contact.
In a former life we had the brilliant idea to buy a dozen CPU chips and upgrade the rack of single proc servers to dual CPU. After a bunch of trial and error we ended up removing the old CPUs and pairing them together in a single server and installing new CPUs in the remaining servers. I'm glad we had an even number of servers.
rayeifler
5 Posts
0
March 29th, 2008 16:00
Now THIS is helpful! My RAID is after-market Adaptec 2120S, so I suspect its not part of the formula. But my luck with CPUs has been bad and this will explain it!
Is there anyway to determine these factors from the chip itself? If I am going to buy a chip on ebay, do I need the seller to run this app to determine a match?
rayeifler
5 Posts
0
March 30th, 2008 18:00
jcn77056
667 Posts
0
March 31st, 2008 14:00
Sorry, I missed the utility was only for the P4 family. In the notes there's reference to the Processor Frequency ID Utility here. That one appears to support the Pentium III chips.
Unfortunately, I don't have any of the servers available anymore to test this. Try it on the two CPUs you have and see what they say. Does is show any differences between the two chips?
I don't think the RAID controller has any affect on the CPU support.