Operating System Microsoft Windows XP Home Edition
Model Dell Inc. Dimension 5000
Motherboard Dell Inc. 0W5363
Processor Intel(R) Pentium(R) 4 CPU 3.00GHz
Processor ID GenuineIntel Family 15 Model 4 Stepping 1
Logical Processors 2
Physical Processors 1
Processor Frequency 2.99 GHz
L1 Instruction Cache 0.00 B
L1 Data Cache 16.0 KB
L2 Cache 1.00 MB
L3 Cache 0.00 B
Bus Frequency 800 MHz
Memory 1022 MB
Memory Type 400 MHz
SIMD 1

that is the readout from the GeekBench program... so i am assuming that the "Memory Type" of 400MHz means that i can only get 400MHz memory... or is that just the speed of the one installed and i can go up to the 800MHz of the Bus?

I am now in completely unknown territory with my computer knowledge...

The Crucial site says this:

Each memory slot can hold DDR2 PC2-4200,DDR2 PC2-6400,DDR2 PC2-5300 with a maximum of 1GB per slot.*

With regards to my Dimension 5000. So what does the 4200 - 5300 or 6400, mean? Are they to do with speed - i would probably want to get the fastest possible for my computer/motherboard, to stave off upgrading the system for longer.

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