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vCPU vs CPU: what you're actually buying in a VPS (2026)

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Every cloud VPS spec sheet lists "vCPU" and every buyer treats it as if it means a whole CPU core. It rarely does. Understanding what vCPU actually maps to determines whether you get more compute than you paid for, exactly what you paid for, or considerably less — and whether the $48/mo DigitalOcean box is genuinely 6x the compute of an $8 Hetzner box or whether they're closer than they look.

What "CPU" and "vCPU" actually mean

A CPU is a physical processor. Modern server CPUs (Intel Xeon, AMD EPYC) have many cores per chip — 16, 32, 64, sometimes 96 or more. Each core can typically run 2 hardware threads simultaneously via SMT (Intel Hyper-Threading, AMD SMT).

A vCPU is a virtualised presentation of one of those hardware threads to a guest operating system. In cloud parlance:

  • 1 vCPU = 1 hardware thread, typically — but not always.
  • On dedicated instances (which cost more), 1 vCPU maps to 1 hardware thread that is fully yours.
  • On shared instances (the default), 1 vCPU maps to a fraction of a hardware thread you share with other tenants.

Every provider does this differently. What "1 vCPU" is worth on a $6 DigitalOcean Basic Droplet is not what "1 vCPU" is worth on a $12.32 OVHcloud VPS-3.

The oversubscription reality

Providers put more virtual cores on a physical host than there are physical cores available. This works because most workloads are idle most of the time. When you request "1 vCPU", you get scheduled fractional time on a real hardware thread. If your neighbours are quiet, you get most of a thread. If they're busy, you compete.

The oversubscription ratio varies:

  • Dedicated / bare-metal cloud (e.g., Hetzner CCX line, DigitalOcean Premium/CPU-Optimized): 1:1. What you pay for is what you get. Higher price.
  • Shared "burstable" tier (DigitalOcean Basic, Vultr Regular, Linode Nanode, AWS Lightsail): ~1.5-3:1. Fine for bursty workloads, less predictable under sustained load.
  • Aggressive shared tier (Contabo Cloud VPS, OVHcloud VPS-1): ~3-5:1. Excellent price per rated vCPU, real trade-off if you run sustained CPU.

How this shows up in real benchmarks

For a rough calibration, single-thread Geekbench 6 scores on similar-generation hardware:

  • Dedicated 3.5 GHz Intel Xeon Ice Lake core (bare metal): ~2500
  • Vultr High Frequency 1 vCPU (3.7 GHz, low oversubscription): ~2400
  • Hetzner CX line (Intel Xeon, moderate oversubscription): ~2000
  • Hetzner CPX line (AMD EPYC, moderate oversubscription): ~2100
  • DigitalOcean Basic Droplet 1 vCPU: ~1500
  • Vultr Regular 1 vCPU: ~1400
  • Contabo Cloud VPS 1 vCPU: ~1200-1600 (variable)
  • AWS Lightsail 1 vCPU: ~1300

The gap between "premium" vCPU (Vultr HF at $6/mo) and "budget" vCPU (Contabo at ~$2/mo per vCPU) is roughly 2x on single-thread. Sometimes bigger, sometimes smaller.

What this means for buying

If your workload is CPU-bound (video encoding, ML inference, unoptimised sync web frameworks like Django without gunicorn, PHP without OPcache):

  • Buy premium vCPU (Hetzner CPX / Vultr HF / DO Premium tier).
  • Do not buy shared tier just because it's cheaper.

If your workload is I/O-bound (typical web app, database with occasional heavy queries, file server, Postgres, most Node.js APIs):

  • Buy the cheapest shared tier that has enough RAM.
  • Hetzner CX / DigitalOcean Basic / Contabo are all fine.
  • Save the money for RAM and storage, which usually bottleneck you first.

If your workload spikes CPU occasionally (WordPress with occasional cache misses, small SaaS backends):

  • Buy shared burstable (DO Basic, Vultr Regular). You get bursty performance when you need it and pay burst prices, not premium prices.

The multi-thread question

Almost all workloads scale poorly beyond the first few cores. Adding a 6th vCPU rarely doubles the throughput of your 3-core setup. If your Node app is single-threaded, more vCPUs help only if you cluster (PM2 cluster mode). If your Rails app uses Puma with multiple workers, each worker takes a core, but the memory footprint scales linearly.

Before buying an 8 vCPU plan because "more is better", profile your workload. On most web apps, the 4 vCPU tier is the last one where you get proportional performance gains from adding cores.

Cost per vCPU across our 10 providers

Cost per vCPU at each provider's cheapest 4-core-or-more plan (as of 2026-09-22):

Provider Plan $ per vCPU
Contabo Cloud VPS 6 $1.77 (6 vCPU / $10.62)
Hetzner CX32 $1.90 (4 vCPU / $7.60)
Contabo Cloud VPS 4 $1.95 (4 vCPU / $7.79)
OVHcloud VPS-3 $2.05 (6 vCPU / $12.32)
OVHcloud VPS-2 $2.13 (4 vCPU / $8.50)
Contabo Cloud VPS 8 $2.48 (8 vCPU / $19.82)
Hetzner CPX31 (AMD) $3.90 (4 vCPU / $15.60)
UpCloud Starter 8 GB / 4 vCPU $5.40 (4 vCPU / $21.60)
Vultr Regular 8 GB $10.00 (4 vCPU / $40)
DigitalOcean Basic 8 GB $12.00 (4 vCPU / $48)
Akamai/Linode Linode 8 GB $12.00 (4 vCPU / $48)

But cost per vCPU is not cost per unit of throughput. A Contabo vCPU at $1.77 and a DigitalOcean vCPU at $12 do not do the same amount of work. They do maybe 60% of the same work — meaning DigitalOcean's vCPU costs approximately 4-5x per unit of actual computed output at this shape, still, but not the 7x the sticker suggests.

The one thing to remember

Cheap vCPU is real value for I/O-bound workloads and stops being value when your workload is actually compute-bound. Nine out of ten small web apps are I/O bound. If yours is the tenth, spend the extra $30/mo on the premium tier — the throughput difference will be visible.

Related guides

Prices as of 2026-09-22.