EXHIBIT 31.2

Certification of Chief Financial Officer Pursuant to Section 302 of Sarbanes-Oxley Act of 2002

I, Timothy C. Barabe, certify that:

1. I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q/A of Affymetrix, Inc.; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

May 3, 2013	/s/ TIMOTHY C. BARABE
	Name:	Timothy C. Barabe
	Title:	Executive Vice President and Chief Financial Officer