AMD's quad-core "Barcelona" Opterons have been notably difficult to find since their introduction two months ago, and The Tech Report has learned that a chip-level problem has impacted the supply of these chips to both server OEMs and distribution channel customers.

Chipmakers refer to chip-level problems as errata. Errata are fairly common in microprocessors, though they vary in nature and severity. This particular erratum first became widely known when AMD attributed the delay of the 2.4GHz version of its Phenom desktop processor to the problem.

News of this problem is notable because it confirms that the TLB erratum affects Barcelona server processors as well as Phenom desktop CPUs, and that the problem impacts AMD's quad-core processors at lower clock speeds.