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ATLAS + Xeon

We have cluster of 32 4Way nodes, build with Intel PIII Xeon 700 MHz w/1
MB L2 cache.
Our problem is, ATLAS reports only 700 MFLOPS per CPU, which means he
can't recognize SSE (during compilation phase, when he check for
SSE/3DNow! he reports that none found).
My question is: is there any way to force ATLAS to using SSE extensions ?