X86-Secret : ES Zone
Pentium 4 1.40 GHz ES  (Week 26, Year 2000)   
INTEL CONFIDENTIAL - QU43ES A4 - C026L03A-0054 - 80528PC1.4G0K - D026L003 - 0305
INTEL CONFIDENTIAL - QAQ2ES COSTA RICA - 3039A537-0054 - 80528PC1.4G0K - 4039A176

Two samples of the Pentium 4 1.4 GHz, one built somewhere near the end of June 2000, the other some weeks before the official launch. QU43 ES is a pre-qualification sample built on the B0 stepping while the QAQ2 is a final qualification sample with the same B2 stepping as the commercial Willamette at launch. Both includes 256K of L2 cache.