Claim: X87 had more than ten implementations, one of which was the Cyrix 6x86
Evidence: 8087 80287 (original) 80387 (and later 287 models) 80486 (or 80487) Cyrix 6x86, Cyrix MII AMD K6 (including K6 II/III) Pentium / Pentium MMX Pentium Pro Pentium II / III Athlon (K7) Athlon 64 (K8) Pentium 4