i have a dell 2400 Pent2.8 that came with 128mb for ram. i decided its too slow so i ordered this memory upgrade. i ordered it on sunday night and opted for the free super saver shipping. they said it would be 7-9 days but mine came on tuesday(just 2 days).
i added it to my existing 128mb ram and now im running at 640mb of ram. works great.

dell 2400 is running on shared memory. it means that ur video/graphics memory depends on your total ram. when i had 128mb of memory my video memory was only 32mb. when i got this upgrade (128+512=640mb)my video memory was at 64 mb. just get this upgrade rather than buying a 64mb video card.computer is faster and the video is a lot better.

i'm running on dell 4550 and this works great. compatability is not a major issue.

-if your computer is extremely picky about RAM, this is NOT NOT NOT the way to go. You may need to use something like the more expensive HyperX

I used so many memories in the past. Kingston's memory is ranked the worst among Crucial, PNY, Apacer and even K-byte. Unstable among many computers.
Some computers won't boot with this brand.

This Kingston DDR-2700 ram is the best all around value out there. I have baught two sticks of the 512 in the past and am about to purchase a third! Whether this will be your first stick or your third,this Kingston ram is a great value.Kingston is the most compatable with other brands of ram,if you decide to buy one of those bargain of the week sticks you see so often,and don't because you're not sure if it will work with your existing ram.Now you can! Kingston adds a definate kick to a machine that has been starving for more ram,and improves noticeably the load and seek times on machines that already have a good supply of memory.The only downside to this Kingston ram,is that it does not seem to overclock well.You can do it,but it's reliability drops to about 45%.If you like to O.C. your rambus you shouldn't push it above a 370 front bus speed. Besides that this is a wise investment.

People, don't waste your $$$ on crappy memory like Kingston, Simple Tech, PNY, etc. If your going to invest in new memory, go with either Corsair or Mushkin. Those are the two brands to look for in memory. If your on a serious budget, go with Crucial, though I highly recommend Corsair and Mushkin. Of the two, I happen to use Corsair in my gaming machine (i say machine because at first glance, it doesnt look like a computer, though technically it is :P), but it doesnt really make a difference.