Yes, we need to describe these physical specs and weigh their performance under various load conditions.
Wackou and I have 7 VPS servers so far, all on the low end of the spectrum, relatively speaking. The lowest being 1GB RAM. Wackou will have to give you the specs for the VPSs he has setup, which the most recent ones were on Vultr with 1GB RAM.
I have 4:
Vultr with a 4GB RAM / Dual core
Crown Cloud 1 2 GB RAM Dual core
Crown Cloud 2 4 GB RAM Dual Core
Bithost 2 GB RAM / Dual core
The above is from memory, I can be more specific when I get back to my workstation.
BM doesn't seem to think our VPS specs should be difficult to meet. Wackou chose 1GB b/c of the low RAM use he observed in testing.
These specs are much more important while testing, primarily the spam testing. This is why the requirements for heavy load testing are different than if we're trying to functionally test transaction variations. It's all necessary testing, it's a matter of coordination. IMO we should first look to verify functionality then look at performance. If something fails it might become difficult to determine if it's a feature logic issue or if it's due to timing / network / VPS limitations.