AMD Athlon Thunderbird core

The major new feature of the third K7 core, Thunderbird, was integrated on die L2 cache. Although the size of the L2 cache was cut in half as compared to the previous Athlon core, the smaller size of the L2 cache was compensated by much faster cache speed.

Identification of processors with the Thunderbird core:

• By part number: Card module (slot A) processors have part numbers starting from "AMD-A" and ending with character "A".
  An example: AMD-A0850MPR24B A
• By part number: Ceramic PGA (socket A/462) processors have part numbers starting from "A" and followed by digits.
  An example: A1300AMS3B
• By CPU ID: First two digits of the CPU identification number for Thunderbird microprocessors are "64".

Athlon Thunderbird core features
New features	Backside 512 KB L2 cache was replaced with integrated 256 KB L2 cache Increased L2 cache speed Increased bus speed to 266 MHz (133 MHz DDR) Ceramic PGA package
Other names	T-bird Model 4
Previous core generation	Orion
Next core generation	Palomino

	Athlon
Manufacturing technology	0.18 micron
Cores	1
Frequency (MHz)	600 - 1400
Fastest processor	Athlon 1.4 GHz (200 MHz FSB) Athlon 1.4 GHz (266 MHz FSB)
Bus frequency	200 MHz 266 MHz
L2 cache size	256 KB
Package	453-pin PGA Card Module
Socket	Slot A Socket 462 / A