Before you order, make sure the RAM is compatible with your motherboard/CPU. It may have some delay.Our customer service will check the status for you. If problem appears, Please DO NOT return or give feedback WITHOUT any former communication. Our professional customer service will resolve for you and give you the best service. We will answer your questions within 24 hours. If you have no reply in 24 hours, please don't hesitate to send us a message again, because the previous message may be lost due to system error. We are committed to resolve all issues in a friendly and satisfactory manner.