While at first glance, it may be in your best interest to shop around. Know that when you purchase RAM from Komputerbay, you're getting Grade-A brand name computer memory. Cheap computer memory, while possibly being compatible, can cause system crashes, error codes in your computer, and even damage to your motherboard! Other sellers may offer you similar looking products for a few cents or a dollar less, but here's the scoop on why: they sell cheap-grade memory and they don't test the modules before shipping! This ends up costing you time and money. Trust when you buy from Komputerbay, you are getting top of the line product from a top of the line company. We test every module before it leaves the building, and back all of our purchases up with a LIFETIME WARRANTY! PC2-4300/PC2-4200 (533MHz) DDR2 240 Pin Desktop memory Upgrade Non ECC, Non parity Unbuffered 1.8V Cas Latency 4.0 Lifetime Warranty Komputerbay's strategy is simple - we have eliminated all the distributors/brokers/agent/etc so as to bring the goods directly from the manufacturer to the end user. By doing so - ours costs go down which in turn brings the selling price down. As far as the warranty is concerned- it's even simpler - the warranty is being provided by the manufacturer who in this situation also happens to be the seller. No more looking for manufacturer's contact information anymore!