On my Intel P4 D830, CentOS Linux 5.4 X86_64 (2.6.20 kernel)
After 1 1/2 minutes, I am receiving :

<core_client_version>6.10.17</core_client_version>
<![CDATA[
<message>
process exited with code 193 (0xc1, -63)
</message>
<stderr_txt>
boinc initialized
work files resolved, now working
-> ../../projects/escatter11.fullerton.edu_nfs/lasievee_1.07_x86_64-pc-linux-gnu
-> -r
-> -f
-> 242052000
-> -c
-> 2000
-> -R
-> ../../projects/escatter11.fullerton.edu_nfs/S2p887.poly
-> -o
-> ../../projects/escatter11.fullerton.edu_nfs/S2p887_242052_0_0
SIGILL: illegal instruction
Stack trace (3 frames):
[0x43f78d]
[0x44e610]
[0x425152]

Exiting...

</stderr_txt>
]]>

Any ideas out there?

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See this thread. You can install the 32-bit Linux version of BOINC if you like and use the 32-bit binary.

Thank you, that explains it.
Will change to 32 bit Boinc and try that.

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