Oracle Cloud Infrastructure (OCI) bare metal gives a customer dedicated access to a physical server rather than a virtual machine running on shared host hardware. It is intended for workloads that need direct host access, strong resource isolation, or specialized CPU, storage, GPU, or cluster-networking capabilities. The right choice depends on the workload and the exact shape and region—not simply on core count.
What is Oracle Cloud Infrastructure bare metal?
Oracle describes a bare metal compute instance as dedicated physical server access, while a virtual machine (VM) is an independent computing environment running on physical bare metal hardware. With OCI bare metal, the customer provisions a whole physical host through the Compute service. With a VM, the customer provisions a virtualized environment on a host.
This distinction matters when an application needs the resources or behavior of a whole host, direct hardware access, control over the hypervisor, or a dedicated resource boundary. A VM is generally a better fit when the application benefits from virtualization and does not need an entire physical server’s CPU, memory, network capacity, or storage.
| Consideration | OCI bare metal | OCI virtual machine |
|---|---|---|
| Underlying environment | Dedicated physical server access | Virtualized environment running on physical bare metal hardware |
| Typical reason to choose it | Whole-host access, isolation, specialized hardware, or host-level control | Workloads that do not require an entire physical host |
| Resource planning | Choose a physical-server shape and account for its CPU, memory, storage, and network resources | Choose a VM configuration suited to the application’s resource needs |
Oracle’s current Compute Shapes documentation states that one x86 OCPU—on Intel or AMD—equals two vCPUs. That relationship is specific to x86 OCPUs; do not apply it to Arm shapes.
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Which OCI bare-metal shape should you choose?
A shape is the template that defines resources such as OCPUs, memory, networking, and storage. OCI’s bare-metal catalog includes Standard, dense I/O, GPU, and HPC/optimized families. Oracle lists Intel, AMD, and Arm-based options, including BM.Standard3 (Intel), BM.Standard.E4/E5/E6 (AMD), and BM.Standard.E6.Ax (Arm). The exact capacity and regional availability depend on the shape.
| Shape family | What it is designed to emphasize | Useful when |
|---|---|---|
| Standard | General-purpose compute across different processor families | You need a dedicated host and should compare CPU architecture, memory, and network capacity for a broad workload. |
| Dense I/O | Local NVMe storage | A database or big-data workload needs high-throughput local storage. |
| GPU | GPU acceleration | AI/ML, rendering, or another workload can use GPU hardware. |
| HPC/optimized | High-frequency cores and cluster networking | A tightly coupled workload depends on compute performance and communication among hosts. |
Before selecting a shape, compare the factors that determine whether it fits the workload:
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- CPU architecture: Confirm that the software supports Intel, AMD, or Arm as applicable. Processor generation and frequency can also matter.
- Memory per core: Compare memory needs as well as core counts, particularly for in-memory databases, analytics, and other memory-bound services.
- Storage: Determine whether the application needs local NVMe, and whether its data and durability requirements suit local storage.
- Acceleration: Choose a GPU family only if the workload can make use of GPU hardware.
- Network and cluster behavior: For distributed workloads, evaluate the network and inter-node communication requirements, not just the compute in a single server.
- Region and capacity: Verify that the exact shape is available in the intended region before designing around it.
- Price: Compare the selected shape’s current regional rate using Oracle’s estimator and price list.
What isolation and control does OCI bare metal provide?
Oracle says it installs “zero software” on its bare-metal instances and describes them as operating without a hypervisor or management agents installed in the customer’s environment. Oracle also says bare-metal instances run in an isolated tenancy and that compute, network, and storage are not oversubscribed. These are Oracle’s descriptions of its architecture, rather than independent benchmark results.
Oracle also describes shielded bare-metal instances, a hardware root of trust, off-box virtualization, and network virtualization isolated using a custom SmartNIC. Its product information says confidential bare-metal instances using AMD Secure Memory Encryption are available on select shapes and in select regions. Check the target region and shape for current availability before relying on any of these options.
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For a single server, a GPU shape may suit AI/ML, rendering, or other hardware-accelerated work. For workloads distributed across servers, the communication between nodes can be as important as the compute in each node.
Oracle’s HPC documentation describes groups of bare-metal instances connected by an ultra-low-latency network. For GPU memory clusters, Oracle describes hosts operating in a hardware-isolated domain with high-bandwidth, low-latency communication. Oracle’s product page cites 100 Gb/sec network interface cards for the GPU cluster networking architecture it describes; that figure is not a guarantee that every OCI bare-metal shape has the same interface or performance. These capabilities are relevant to tightly coupled scientific computing and distributed AI training, where inter-node traffic can affect runtime.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does OCI bare-metal pricing work?
Oracle states that on-demand compute is billed by the second. The applicable amount depends on the selected shape, so there is no single OCI bare-metal price that applies across configurations. Use Oracle’s Cost Estimator and current Cloud Price List to check the shape and region you plan to use. Rates, promotions, shape generations, and availability can change.
Quick Recap
How to make the final choice
- Decide whether you need a whole host. Choose bare metal when direct physical-server access, host-level control, or dedicated resources matter to the workload; consider a VM if they do not.
- Match the workload to a family. Compare Standard, dense I/O, GPU, and HPC/optimized options against CPU, memory, storage, acceleration, and cluster-networking needs.
- Check the exact configuration. Confirm architecture compatibility, shape resources, and availability in the target region.
- Estimate the cost for that configuration. Use Oracle’s current estimator and price list for the selected shape and region rather than relying on a general price figure.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
