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So slots don't matter either?
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Actually, it might be better to buy from (or at least get a quote from) Dell so you can know exactly what type (speed, rating, etc) you should be getting - odds are they will (should) look up the machine by service tag and provide you an appropriate quote (you might specifically request they do that).
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I have a PE2900 server. I want to upgrade the memory in that server. Are there any requirements that are needed to do the upgrade? Is it as simple is just plug and play?
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I have a PE2900 server. I want to upgrade the memory in that server. Are there any requirements that are needed to do the upgrade? Is it as simple is just plug and play?

Server Memory Upgrade

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.