What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
The exact meaning of the added “0Q” suffix is not confirmed by the available Samsung documentation. Samsung’s 2013 guide identifies the base model M393A2G40DB0-CPB as a 16GB, 2Rx4, 288-pin DDR4 registered DIMM (RDIMM)—not an LRDIMM—and says its RCD and data-buffer codes are Samsung-specific rather than JEDEC identifiers. The guide does not decode “0Q” itself. Samsung DDR4 product guide
What the base model tells you
Samsung’s December 2013 DDR4 product guide lists M393A2G40DB0-CPB in its 288-pin DDR4 Registered DIMM table. The specified module is 16GB, 2Rx4. The guide lists LRDIMMs separately, under the M386 model family. So describing this M393A model as an LRDIMM is inconsistent with Samsung’s product classification. Samsung DDR4 product guide
Samsung’s current DDR page likewise treats RDIMM and LRDIMM as distinct module categories; it describes RDIMMs as registered modules used for server platforms. Samsung DDR page
What is—and is not—known about “0Q”
The guide explains that some RCD and data-buffer identifiers are codes used by Samsung, not JEDEC-standard codes. That makes a proprietary component-related meaning plausible, but the guide’s available code table does not map “0Q” to a specific buffer vendor, chip, revision, or compatibility characteristic. The most accurate answer is therefore that the precise meaning of “0Q” is unconfirmed.
PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match#1 Best Overall
- Compatible Memory (RAM) Replacement for Samsung M393A2G40DB0-CPB
Do not treat the full string M393A2G40DB0-CPB(0Q) as proof that 0Q names a particular buffer or revision. A discussion of CPB0Q and CPB3Q variants records owners’ questions and speculation, but does not establish what either suffix means. Reddit discussion
How to check whether a particular stick will work
Do not decide interchangeability from the final suffix alone. Compare the module’s complete label and, when available, its SPD data; then check the server manufacturer’s memory support list and population rules.
Rank #2
- Samsung M393a2g40db0-cpb 16GB DDR4 2133MHz ECC Reg Memory
- Module type: Confirm the server accepts DDR4 ECC RDIMMs. Do not substitute an LRDIMM based on a similar-looking model string.
- Capacity and organization: Check the module’s capacity and rank/organization against the server’s supported configurations. Samsung specifies 16GB and 2Rx4 for the documented base model.
- Speed: Match the module’s DDR4 speed grade to the platform’s supported memory speeds and population rules.
- Full identity: Compare all printed part-number and label details, and SPD information where available. A shared base model does not establish that suffix variants are identical.
If an exact suffix decode matters, ask Samsung or the system vendor for a record that maps the complete part number, or inspect the module’s SPD and component markings. Without that evidence, do not infer the component maker or assume CPB0Q and CPB3Q are interchangeable.
Quick Recap
Best Value
- EXACT-MATCH UPGRADE — 16GB (1X16GB) DDR4-2133 (PC4-17000), 2Rx4 Registered ECC, 1.2V, 288-pin. The precise rank, voltage, and timing your server's memory controller expects, so it's recognized at full capacity and runs at its rated speed.
- VERIFIED FITMENT — Direct replacement for M393A2G40DB0; compatible with Xeon E5, PowerEdge, ProLiant, ThinkSystem, Supermicro. Spec-matched to your board's memory-population rules.
- ENTERPRISE STABILITY — Registered (buffered) architecture offloads the memory controller so every slot runs fully populated at full capacity, while ECC catches and corrects single-bit errors on the fly — stopping silent data corruption and unplanned reboots before they reach production.
- CHECK YOUR CONFIG — Server and motherboard memory support varies by model. Consult your system or motherboard manual for supported capacities, approved DIMM population order, and installation steps before purchase.
- LIFETIME SUPPORT — Backed by a lifetime replacement warranty and free US-based technical support.
Rank #4
- RigidRAM memory super charges your computer to help load the operating system and other essential programs faster, reducing the waiting time and improving your user experience.
- Increased Capacity: Boost your system's memory capacity for smoother multitasking and resource-intensive applications.
- RigidRAM authentic modules come from our midwestern U.S. headquarters
- Work smart, add productivity, multitask better & game at higher frame rates. Works with all processor brands.
- UNSPSC Code 32109092
Rank #3
- OWC 16GB DDR4 2133MHz PC4-17000 ECC Registered RDIMM 288-Pin 2Rx4 1.2V memory RAM module, replacement for Samsung part numbers M393A2G40DB0‐CPB and M393A2G40EB1‐CPB.
- ECC REGISTERED UPGRADE: This type of memory is used in Workstations and Servers. It will NOT be compatible with standard desktop computers. Also, it cannot be mixed with UNBUFFERED memory.
- 100% COMPLIANT: With JEDEC-Standard specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs.
- MAXIMIZE YOUR SERVER: With OWC's ECC Registered Server Memory, you will extend the life of your old infrastructure or save money when building a new one.
- INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing.
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.
