Summary: was worried that this ram was not going to be compatible unlike the other brand we tried with corsair, but this PNY brand works 100% good. waited couple hours, no shutdown nor sluggish. fast ship.
Summary: Good value for new memory. I had 512MB in an old HP and added another 512MB in the 2nd slot (1MB max on this PC) and now the PC runs much faster and with less issues when running XP and Linux.
Summary: A couple of these 1/2 GB memory cards worked perfectly to bring new life to an old Sony VAIO desktop that would slow to a crawl while running only basic software applications (like web browsing). It seems that 1/2 GB is no longer enough memory even for Windows XP. Even after stripping out extra programs, the memory usage was on the brink. Bumping the memory up to 1 GB provided enough margin (so far).
Summary: The PNY OPTIMA 512MB DDR 333 MHz PC2700 Desktop DIMM Memory Module (MD0512SD1-333) was just what the doctor ordered to pick up performance of my aging desktop PC. The increased RAM produced a very noticeable enhancement in speed of most all operations. The value, 2-day Prime shipping and easy installation would be hard to beat.