I am sure this is a nice memory stick. I ordered one, but received something for an Apple iMac. This won't fit an HP, sorry. The vendor, computer brain, is making it very difficult to get an RMA for this, they're a 3rd party re-seller, with a very well organized twist and turn at every angle. It took weeks to get, with several plausible, yet unlikely reasons about the shipping date and tracking number slipping. Funny, I had the same problem with another item I purchsed at the same time from them. They do have a real person who picks up on the third ring, and they really do respond to email...so, I dunno, maybe it's just me.
The correct 512M 184 pin DIMM PC3200 I received from another vendor got here in 2 days, and is a carbon copy of what is shown here. nice job, and I am confident it will work. I just gave the 1 star because of my experience with computer brain.