MO Memory LLC Your computer memory upgrade is here! Item Details Matched pairs of 2GB DIMMs by Hynix, Nanya, Samsung, etc...1333MHz, PC3-10600, Non-ECC, DDR3, 240-Pin DIMMs Guaranteed compatible with Dell Optiplex 380, 580, 780, 790, 980. Please be sure your system uses PC3-10600 memory before purchasing. About our Product TestingAll our used RAM has passed testing with no errors prior to shipment.Our DDR3 RAM modules are tested using the RAMcheck LX system. Shipping Memory products are also anti-static bubble wrapped for safety. We ship next day (Monday-Saturday) after cleared payment is received. Our central U.S. location + next day shipping = you get your purchase fast. Tracking info is posted to the transaction & emailed to you prior to shipping. Free shipping to the U.S. mainland, Alaska, and Hawaii. We ship to a domestic, PayPal confirmed address only. Sorry, no local pick-ups. Payments PayPal payments only please. Thank you. Sales Tax State and Local sales tax (8.6%) will be charged for all Missouri customers. ReturnsMO Memory LLC offers eBays automated, Hassle-Free Returns.Simply initiate a return from your My eBay transaction page within 14 days.Buyer must indicate an accurate and honest reason for return.Buyer must follow eBays item condition policy for returns.MO Memory LLC uses serial numbered, tamper-proof warranty stickers.All returns must have the warranty stickers still attached and fully intact.