I am having 15 websites divided into 2 groups:
Group 1 includes ONE website with 1000 visitors per day
Group 2 includes ALL OTHER websites with total 200 visitors per day.

I am currently using a VPS for the Group 1 with the following configuration:
Quad-Core Intel Xeon E3-1220 3.1Ghz; 3Gb RAM; 60GB HDD

For Group 2, I am using a dedicated server with the configuration: Quadcore X3430 2.4Ghz, Ram 8Gb,HDD 500Gb

Group 2 runs fine so far ( as it only has 200 visitors/day).
But the VPS for group 1 is often suspended recently (every 2 or 3 days). The hosting provider tells me that I should upgrade the VPS as RAM is not enough.

Could you please give me advice? Should I upgrade the VPS or move the group 1 to the dedicated server?

Thanks in advanced.

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