CPUs > Intel > Xeon > P6 Architecture

Contents

History
Models
Models (list)
From collector's point of view

---

From collector's point of view

Except the first Pentium II Xeon Engineering samples at 300 and 350 MHz, we can say that Xeons of first generation weren't so hard to find. We could even say that for some models, it was easier to find ES version than commercial ones (Pentium III Xeon 500 and 550 for example)...
Actually, it can be easily explained by the way the professional market, which use much this kind of cpus, works. Companies regularly and in big quantities updates their computers. So when it happens, the second-hand market is flooded by this kind of cpus. The draw back is that once all companies have upgraded their machines, it became harder to find older cpus.
So, some years ago, those Xeons were everywhere, but now, there are less and less around, because companies don't use them anymore for long time, and now upgrade from Pentium 4 Xeons...
But, anyway, for still some time, it should not be too hard to complete the family, for aware collectors.

---

Name	Variation	Release date	Rarity	In collection ?
Pentium II Xeon
Intel Xeon 300 (1M, ES)	-	Never officially released		no
Intel Xeon 300 (2M, ES)	-	Never officially released		no
Intel Xeon 350 (512K, ES)	-	Never officially released		yes
Intel Xeon 350 (1M, ES)	-	Never officially released		no
Intel Xeon 400 (512K)	-	29/06/1998		yes
Intel Xeon 400 (1M)	-	29/06/1998		yes
Intel Xeon 450 (512K)	-	06/10/1998		yes
Intel Xeon 450 (1M)	-	05/01/1999		yes
Intel Xeon 450 (2M)	-	05/01/1999		yes
Pentium III Xeon
Intel Xeon 400 (ES)	-	Never officially released		yes
Intel Xeon 500 (512K)	-	17/03/1999		yes
Intel Xeon 500 (1M)	-	17/03/1999		yes
Intel Xeon 500 (2M)	-	17/03/1999		yes
Intel Xeon 550 (512K)	-	17/03/1999		yes
Intel Xeon 550 (1M)	-	17/03/1999		yes
Intel Xeon 550 (2M)	-	17/03/1999		yes
Intel Xeon 600	-	25/10/1999		yes
Intel Xeon 600 (1M, ES)	-	Never officially released		yes
Intel Xeon 600 (2M, ES)	-	Never officially released		yes
Intel Xeon 650 (ES)	-	Never officially released		no
Intel Xeon 667	-	25/10/1999		yes
Intel Xeon 700 (1M)	-	22/05/2000		yes
Intel Xeon 700 (2M)	-	22/05/2000		yes
Intel Xeon 733	-	25/10/1999		yes
Intel Xeon 800 (256K)	-	12/01/2000		yes
Intel Xeon 800 (2M, ES)	-	Never officially released		yes
Intel Xeon 866	-	10/04/2000		yes
Intel Xeon 900	-	21/03/2001		yes
Intel Xeon 933	-	24/05/2000		yes
Intel Xeon 1000	-	08/08/2000		yes

---

Models (list)

---