Memory upgrade question

Hi, I am looking to add memory to my computer and was looking for some advice.
I have one of the first generation P4 1.5 GHZ which requires Rambus ram. Currently I have 128MB of 600-53 installed and wish to add 512MB (2X256). So my question is whether I should get 2x256 at 800, and discard the 600's (since they'll slow it down), or just add 2x256 at 600MHZ and leave the original ram in. I am not really sure whether faster ram is going to give a noticeable difference. This is further complicated because I am unsure whether my motherboard supports 800 and am unsure how to find out (it's a Dell Dimension 8100, as such didn't come with a manual for the motherboard). I use this computer for mostly gaming and internet.
Thanks for your help.
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More about memory upgrade question
  1. I would stick with 600, cheaper. I wouldn't invest a lot of money in old RAM for that system.
  2. Thanks for the input.
    As to where to get it, there are a lot of companies listed on pricewatch.com that offer what I'm looking for about $45 for 256MB, should I be wary of using these companies even though several of them offer pretested units with lifetime warranties?
    Again, I really appreciate the help!

    -joe
  3. You can't add different clocked memory to an existing Rambus system, all memory must be of the same speed, or it just won't work.

    <b><A HREF="http://www.multiplaycity.com/diy1/005/intelhsf.jpg" target="_new">I'm an Intel fan</A></b>
  4. I was under the impression the memory would default to the lowest supported speed.
    Anyways, the consensus is PC600 so I'll go with that.
  5. I'd go with PC800 since you're dealing with a 400 bus CPU. But really, the P4 1.5 was very weak, you can find faster PIII systems. Have you considered upgrading the board/CPU?

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  6. Here is a link if you are interested:
    <A HREF="http://store.yahoo.com/digi4me/rdrampc184pi3.html" target="_new">http://store.yahoo.com/digi4me/rdrampc184pi3.html</A>
  7. Just to follow up:
    I went ahead and got the 512 MB of PC600 for my system and its running great with performance WAY up (What was I doing running XP for 2 years w/ 128mb?!?). This upgrade will allow me to endure the next two years until I am able to afford (and learn how) to build my own new computer.
    Thanks for helping me out.
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