Exceptional 256MB HP Compaq ENT Center Z558 DDR 400MHz Unbuffered DIMM desktop memory upgrades

This item is in-stock!

98% of all orders received before 1PM PST, will ship same day. An acceptance email will be sent confirming we received your order, a second email when it is in warehouse processing and when we ship you will be emailed a third time with a tracking number.

An even better deal with FREE SHIPPING! *

PRO Memory Upgrade will ship your order free of charge via Fedex ground. The free shipping is limited to four kits, above that there may be some additional charge. This service is ground and may take 3-7 days, but it is FREE.

* Continental US Only

Lifetime Warranty

• Lifetime Warranty is only valid to the original purchaser, cannot be transferred to third party.
• Replacements will be made unless items are unavailable then a refund will be given.
• Items must contain all original, not tampered with, labels.
• See RMA policy.

Why Buy From Us?

We understand there are many places you can buy expansion options for your system online. We want to earn your business and choose to offer the absolute highest quality products available anywhere in the world. We deliver only genuine factory modules to our customers.

The same standards Apple, Dell, HP, IBM and other computer OEMs demand when configuring new systems for the first time. PRO Memory Upgrade is owned and operated by a team that has been in the DRAM industry since 1988. Supported by a huge infrastructure as well as deep relationships within the semiconductor community allowing us to bring the latest technology to the online market first. There is no other place online to find this standard of quality at these values. We care about your system and want to surpass your expectations.