Well, they had IPC between a Athlon 64 and Phenom II, somewhere around that of an Athlon II, maybe a little less. Combine that with low clock speeds (mid 2.xGHz range) and little headroom, plus the TLB bug issue (which had a fix which lowered performance from what I recall), and they weren't that fabulous. Is it terrible though? No. It's below a Core 2 Quad Q6600 though to give an idea.
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