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This is a two part question.

  1. how much memory can I install in this computer, not how much is recommended. Can you go beyond 8G

  2. How much faster is the PC 6400 to PC 5300 chip?

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8GB is the max according to HP's website.

You probably will not notice a huge difference in the real world. Here is a comparison from Wikipedia:

enter image description here

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The Windows Experience Index for my RAM dropped from 5.9 to 5.3 (If I remember correctly) when I installed a slower PC 5200 module. That's a difference of 10%. It can depend on the chipset, because AMD has a better memory controller. But the price difference is only 1€ for a module, hence it's better to buy the faster memory if you want to be sure, as well as minimize cost versus speed.

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By performance index, do you mean Windows Experience Index? – iglvzx Jan 7 '12 at 0:40
@iglvzx: Yes, it goes up to 7,9 for each component. – Betterdev Jan 7 '12 at 0:42
WEI's are not linear. 5.9 to 5.3 is not "10%" in any meaningful sense. – David Schwartz Jan 7 '12 at 2:18
WEI isn't exactly your best benchmark either. For example, I use a Z68 board with IntelSRT (SSD Caching of HDDs). In real life, the setup works very fast, but in Benchmarking, it's much slower since it hasn't cached any data. – kobaltz Jan 7 '12 at 2:27
@DavidSchwartz: What do you mean 10% isn't meaningful sense? – Betterdev Jan 7 '12 at 2:31

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