When I moved to RELENG_7 on my machine i have experienced some SIGILL's on graphic applications. Looking into the cause I found this in gcc docs: _athlon, athlon-tbird_ AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and SSE prefetch instructions support. But my processor lack any SSE support: CPU: AMD Athlon(tm) Processor (1343.06-MHz 686-class CPU) Origin = "AuthenticAMD" Id = 0x644 Stepping = 4 Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR> AMD Features=0xc0440800<SYSCALL,<b18>,MMX+,3DNow!+,3DNow!> I have tried to enable CPU_ATHLON_SSE_HACK in kernel, but with no luck. I have also verified that I'm running the last available BIOS for my motherboard. Now when I have moved to k6-2 my system is working and stable as hell... Am I missing something weird? -- Sphinx of blackb quartz judge my vow.