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Plain-English answers to the questions UK IT teams actually ask about HPE ROK Windows Server licensing and DDR5 server memory. No fluff.
HPE ROK vs standard Windows Server
Buy HPE ROK if it runs on an HPE ProLiant server. Buy a volume or standalone licence for anything else. Same Windows Server, cheaper, locked to HPE hardware.
Read the guide6 min read- HPE ROK
HPE ROK Standard vs Datacenter
Standard is usually first choice for 1–2 VMs. Beyond that, compare stacked Standard against Datacenter pricing. They share the same base platform; Datacenter adds virtualisation rights and a few features.
5 min read - Windows Server
Windows Server core licensing explained
Windows Server 2022 and 2025 are licensed per physical core. Every server needs at least 16 cores licensed, and at least 8 per processor. Here is how to count what you actually need.
6 min read - Server memory
RDIMM vs LRDIMM server memory
Buy RDIMM. Choose LRDIMM only when you need the largest module sizes your platform offers and the server explicitly supports it. Here is the difference, and how to know it fits.
5 min read - Server memory
DDR5 vs DDR4 server memory
DDR5 is in new servers. DDR4 still runs most of what is already deployed. This is what changed, which platforms support DDR5, and when the upgrade makes sense.
7 min read - Oracle
Oracle Database SE2 licensing explained
SE2 is licensed per occupied processor socket, with a hard limit of 2 sockets per server. High socket or thread counts can push you to Enterprise Edition — so verify the exact processor.
6 min read - Oracle
Oracle Java SE Universal Subscription
Since 23 January 2023, Oracle Java SE sells only as the Universal Subscription: priced per employee across your whole headcount, not just the people who use Java.
5 min read - Cisco Meraki
Cisco Meraki licensing explained
Meraki licences are per device, but the model is not. There are now three — Subscription, Co-Termination and the closing Per-Device Licensing. Here is the current state.
6 min read - Server memory
DDR5 server memory compatibility
DDR5 only fits a DDR5-capable platform — it will not go in a DDR4 slot. The module type and maximum size depend on your server. Here is how to check before you buy.
5 min read - HPE ROK
Where to buy genuine HPE ROK in the UK
Buy HPE ROK from a reseller that supplies genuine, channel-traceable OEM kits and can confirm the licence matches your HPE ProLiant. Here is what to check.
5 min read - For brokers
Trade pricing for IT brokers
Register as a broker, get approved, then access trade pricing and same-day quotes across the range. Here is how the broker programme works.
4 min read