Kernel panic on MacPro in Single-User mode after memtest.

I've had about 7 kernel panics in about 7 days on a new MacPro. 2 gigs of RAM (Apple Installed). Fresh install of OSX (no user import). While going through the troubleshooting process I ran memtest in single user mode. Ran it all night no errors.
So in the morning I typed ctrl-c and then exit (i think)... it seemed to start the process of booting and I got another kernal panic. I've actually done this three times now.
I checked panic.log and all the error messages but 1 were the same. Including the ones I got in single-user mode (copied below).
Should I be able to gracefully exit out of single-user mode without a kernel panic?
Does this point to a RAM error even though memtest and AHD for that matter ran all night without finding anything?
I'm all set to try again (taking careful notes this time) to see if I can reproduce but I was hoping for some feedback first.
Thanks,
Craig
Sat Jan 27 22:17:27 2007
panic(cpu 0 caller 0x41C47CC4): Uncorrectable Fbd memory error detected. ferr = 20000000 , nerr == 00000000, fErrFat = 20000000 nErrFat == 00000000
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x108cd8 : 0x128d08 (0x3c9a74 0x108cfc 0x131de5 0x0)
0x108d18 : 0x41c47cc4 (0x41c49f1c 0x20000000 0x0 0x20000000)
0x108da8 : 0x41c47f58 (0x406a180 0x406a180 0x2 0x820044)
0x108e38 : 0x66a712 (0x406a180 0x0 0x3ba3680 0x0)
0x108e68 : 0x66a59b (0x3b92780 0x0 0x0 0x1c)
0x108e88 : 0x67d9be (0x1c 0x108ef8 0x8 0x67f4be)
0x108eb8 : 0x67db68 (0x3b91b1c 0x17 0x3b928ca 0x3b81120)
0x108f18 : 0x68a743 (0x3b34348 0x0 0xafdd0c77 0x4cd5)
0x108f38 : 0x70a4fb (0x3b34348 0x0 0x3abac80 0x0)
0x108f68 : 0x67053f (0x3b88600 0x0 0x3b87580 0x49)
0x108f88 : 0x669c1f (0x3b6b800 0x0 0x3b87580 0x49)
0x108fa8 : 0x3ba298 (0x3b87100 0x0 0x3b92f00 0x49)
0x108fe8 : 0x19aa80 (0x25423e30 0x25423e30 0x19bad6 0xb26000)
0x25423f18 : 0x1a445b (0x10 0x1 0x4af85c 0x6)
0x25423f38 : 0x19d871 (0x0 0x0 0x25423f68 0x206)
0x25423f58 : 0x135f14 (0x0 0x0 0x0 0x19d23a) Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleMCEDriver(1.1.2f1)@0x41c44000
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x664000
com.apple.driver.AppleAPIC(1.2.0)@0x709000
com.apple.driver.AppleACPIPlatform(1.0.8)@0x668000
dependency: com.apple.iokit.IOPCIFamily(2.2)@0x57d000
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x664000
Kernel version:
Darwin Kernel Version 8.8.4: Sun Oct 29 15:26:54 PST 2006; root:xnu-792.16.4.obj~1/RELEASE_I386
MacPro   Mac OS X (10.4.8)  

Welcome to Apple Discussions!
Yes, your memory or memory slot, or memory seating is bad or off. "Uncorrectable Fbd memory error detected. ferr = 20000000 , nerr == 00000000, fErrFat = 20000000 nErrFat == 00000000"
Clearly a memory related issue. It may also be that memtest doesn't know how to diagnose the new kind of memory and is reporting that back to the logs. Take it in to a service center to have all the boards replaced to make sure the issue isn't reproduceable with new memory. If it is, then I'd consider the slots on the logicboard a problem.

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