4 vCPU is not always 4 vCPU

VPS providers advertise plans with familiar numbers: 2 vCPU, 4 vCPU, 8 GB RAM, a monthly price. But the vCPU count alone doesn't tell you how much physical CPU is actually underneath it.

What tells you that is the CPU ratio — how many virtual CPUs are allocated against each physical core.

A 4:1 ratio means four virtual CPUs are allocated for every one physical CPU core.

Try it

Below is one physical core. Drag the first slider to change the CPU ratio and watch that same core get divided into more pieces. Drag the second to simulate how busy those vCPUs are.

1 physical core

Divided across 1 vCPU

CPU ratio

1:1

Workload

20%

At a 1:1 ratio the vCPU has the whole core to itself, so contention stays near zero no matter the workload.

What the ratio means

1:1: One vCPU per physical core. No sharing.
2:1: Two vCPUs share each physical core.
4:1: Four vCPUs share each physical core.
8:1: Eight vCPUs share each physical core.

A higher ratio doesn't automatically mean worse performance — workloads rarely use their full allocation at once. It becomes a problem only when several of those vCPUs get busy at the same time, because the hypervisor then has to schedule them onto the same physical core, one after another.

Why 4 vCPU doesn't tell the whole story

Three VPS plans, all advertised as 4 vCPU. Click a row to see what's actually behind each one.

Plan	Advertised	Price	Ratio
Example A	4 vCPU	$10/month	8:1
Example B	4 vCPU	$18/month	4:1
Example C	4 vCPU	$25/month	1:1

Prices are illustrative examples, not real provider pricing.

Example A: 4 vCPU at an 8:1 ratio — eight virtual CPUs share each physical core.

Does a cheaper VPS mean a worse CPU?

No. A low price doesn't automatically mean heavy sharing, and a higher price doesn't automatically mean a lower ratio. Pricing also reflects processor generation, memory, storage, network capacity, support and the provider's infrastructure model.

Price tells you what you pay. vCPU tells you what's allocated. CPU ratio tells you how heavily the physical processor is shared.

Is a lower ratio always better?

A lower ratio means fewer vCPUs compete for each core — but it's still only one part of performance. Processor generation, clock speed, host utilisation, storage, memory, and workload type all matter too. A modern processor under a sensible shared configuration can outperform an older one at a "better" ratio.

A useful question to ask your provider What CPU ratio are you using?

4 vCPU is not necessarily the same as another 4 vCPU.

The vCPU number is the allocation. The price is the cost. The ratio is what tells you how that allocation relates to the physical hardware underneath it.