Choosing a 1200W server power supply is less about the wattage printed on the label and more about whether the unit fits your system’s power bay, wiring, and service requirements. My leading pick is the HP Common Slot Platinum 1200W Kit for compatible HP servers: it adds hot-swap servicing and a stated 80 PLUS Platinum efficiency rating. The HP DPS-1200SB is the more relevant option when you need an ATX-format supply and your system accepts its 200–240V input range.
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These units are not interchangeable just because both deliver 1200 watts. One is a server-specific Common Slot supply with a broad stated input range; the other is an ATX unit described for personal computers. Both are renewed and carry a minimum or stated 90-day warranty, so condition and platform compatibility matter as much as capacity. I rank the Common Slot kit first for server use, while the DPS-1200SB serves a narrower ATX use case.
Complete the kit
Key Takeaways
- For a compatible HP server, the 656364-B21 Common Slot kit is the stronger fit: it is designed for HP server and storage systems and supports hot-swap, tool-less installation.
- Efficiency information separates the two: the Common Slot model lists 80 PLUS Platinum certification, while the DPS-1200SB description gives no efficiency certification.
- The DPS-1200SB is an ATX-format option, not a universal server replacement: check the chassis, connector, and 200–240V input requirements before choosing it.
- Both options are renewed: each comes with a 90-day warranty term, so buyers should verify the exact unit condition and return terms with the seller.
- 1200W capacity does not prove system compatibility: confirm the required supply type, input power, connectors, and redundancy arrangement before ordering.
| HP Common Slot Platinum 1200W Power Supply Kit (656364-B21, Renewed) |  | Best Overall for Compatible HP Servers | Brand: HP | Model: 656364-B21 | Output wattage: 1200W | VIEW ON AMAZON | See Our Full Breakdown |
| HP 660185-001 1200W Platinum Power Supply |  | Best ATX-Format Alternative | Brand: HP | Model: DPS-1200SB | Manufacturer part number: 660185-001 | VIEW ON AMAZON | See Our Full Breakdown |
| server power supply 1200w | Brand | Model | Output wattage | Form factor |
|---|---|---|---|---|
| HP Common Slot Platinum 1200W | HP | 656364-B21 | 1200W | Common Slot (CS) |
| HP 660185-001 1200W Platinum P | HP | DPS-1200SB | 1200W | ATX |
More Details on Our Top Picks
HP Common Slot Platinum 1200W Power Supply Kit (656364-B21, Renewed)
The HP Common Slot Platinum 1200W Kit earns my top position because it is the option in this pair designed specifically for compatible HP servers and storage systems. Its hot-swap, tool-less installation matters in a rack or other setup where replacing a failed supply without a long service interruption is more useful than a generic ATX fit. The listing also identifies 80 PLUS Platinum efficiency, giving buyers a clearer efficiency reference than the DPS-1200SB provides.
Its advantage depends on having the right HP Common Slot platform. This is not a general-purpose 1200W server supply, and the product description does not establish compatibility with every HP model. I would confirm the system’s supported part numbers and bay style before ordering. Compared with the DPS-1200SB, this unit is more purpose-built for server maintenance but less flexible for a conventional ATX chassis.
The main compromise is its renewed condition. The listing says the unit is certified refurbished and includes a minimum 90-day warranty, but a short warranty is still a limited safety net for equipment expected to run continuously. It may also arrive in a generic box. I would choose it when Common Slot fit and serviceability are confirmed, not simply because its wattage matches an existing supply.
Pros:- Designed for compatible HP servers and storage systems
- Hot-swap, tool-less installation supports faster service replacement
- 80 PLUS Platinum efficiency certification is specified
- 1200W output and a minimum 90-day warranty are stated
Cons:- Compatibility is limited to systems designed for HP Common Slot supplies
- Renewed condition and minimum 90-day warranty may not suit long-term deployment needs
- Generic packaging may be used
Best for: Owners of a compatible HP server or storage system who need a 1200W Common Slot supply and value hot-swap servicing.
Not ideal for: Buyers with an ATX desktop, a non-HP server, or an HP system whose documentation does not list the Common Slot part number.
- Brand:HP
- Model:656364-B21
- Output wattage:1200W
- Efficiency:80 PLUS Platinum
- Form factor:Common Slot (CS)
- Compatible systems:Compatible HP servers and storage systems
- Installation:Hot-swap, tool-less
- Input voltage:Minimum 100V AC; maximum not specified in the supplied details
- Condition and warranty:Renewed, certified refurbished; minimum 90-day warranty
Our verdict“For an HP server confirmed to accept the 656364-B21, I would choose this over the ATX DPS-1200SB for its server-specific fit, hot-swap design, and stated Platinum efficiency.”
HP 660185-001 1200W Platinum Power Supply
The HP DPS-1200SB is the more suitable pick when a build calls for an ATX-format 1200W supply rather than an HP Common Slot module. Its listed 200–240V input range is an important constraint: it may suit installations wired for that range, but it is not the right choice for a typical 120V-only circuit based on the supplied specifications. Buyers should check both the power source and the system’s actual requirements before purchasing.
Compared with the 656364-B21, the DPS-1200SB trades server-oriented hot-swap service for a familiar ATX form factor. That can make it relevant to a compatible personal computer or custom system, but the description does not identify it as a Common Slot server replacement. Nor does it list an 80 PLUS certification, despite the product title using “Platinum.” I would not treat that title alone as proof of a specific efficiency rating; buyers should verify the exact unit’s documentation.
The listing names a single fan for air cooling and a 90-day limited warranty, while its renewed condition adds uncertainty about remaining service life. The standard ATX form factor and stated 1200W output are useful only if dimensions, connectors, and input voltage align with the intended system. Relative to the Common Slot kit, this is the narrower choice for buyers who need a specific ATX supply, not my first recommendation for an HP rack server.
Pros:- 1200W output in an ATX form factor
- Stated 200–240V input range suits systems wired for that supply
- Single air-cooling fan is specified
- 90-day limited warranty is stated
Cons:- 200–240V input range rules it out for many 120V-only installations
- No 80 PLUS efficiency certification is listed in the supplied specifications
- Renewed condition can mean less certainty about remaining lifespan
Best for: Buyers whose compatible system specifically accepts an ATX supply and operates on a 200–240V input.
Not ideal for: Owners seeking a hot-swap HP Common Slot server supply, anyone on a 120V-only circuit, or buyers who require a documented efficiency certification.
- Brand:HP
- Model:DPS-1200SB
- Manufacturer part number:660185-001
- Output wattage:1200W
- Form factor:ATX
- Connector type:ATX
- Input voltage:200–240V
- Cooling:Air cooling; one fan
- Condition and warranty:Renewed; 90-day limited warranty
Our verdict“Choose the DPS-1200SB only when your system calls for ATX, accepts its 200–240V input, and does not require the Common Slot kit’s server-specific hot-swap design.”
How We Picked
I ranked these two options around the job implied by the search: powering a server with a 1200W supply. That makes platform fit and serviceability more important than treating wattage as the only deciding factor. The Common Slot kit is explicitly intended for compatible HP servers and storage systems, while the DPS-1200SB is listed as an ATX supply for personal computers. I gave the former the lead for server buyers, but kept the ATX model in the roundup for systems that specifically accept that format.
I also compared the details that change day-to-day ownership: efficiency information, input-voltage range, installation style, and warranty. The 656364-B21 listing identifies 80 PLUS Platinum certification and hot-swap, tool-less installation. The DPS-1200SB listing specifies 200–240V input and a standard ATX form factor, but does not state an efficiency certification. Both products are renewed, so neither earns a blanket recommendation for buyers who require a new unit or a longer warranty.
There are only two products in this comparison, and their roles are deliberately distinct rather than interchangeable. I do not assume that a familiar connector name guarantees compatibility: server supplies can rely on chassis-specific mechanical fit, pinouts, firmware expectations, and airflow direction. I recommend checking the server’s service documentation and the exact part number before purchase. Where the supplied product details do not establish a specification, I leave it unclaimed rather than filling the gap with an assumption.
| server power supply 1200w | Form factor | Condition and warranty |
|---|---|---|
| HP Common Slot Platinum 1200W | Common Slot (CS) | Renewed, certified refurbished; minimum 90-day warranty |
| HP 660185-001 1200W Platinum P | ATX | Renewed; 90-day limited warranty |
Factors to Consider When Choosing Server Power Supply 1200w
Before selecting either 1200W unit, I would match the replacement to the actual server or chassis rather than starting with capacity alone. The two picks use different formats and serve different installation needs. The checks below help separate a suitable replacement from a supply that has enough wattage but cannot safely or physically work in the system.
Match the power supply format to the system
Common Slot and ATX are different product roles. The HP 656364-B21 is designed for compatible HP Common Slot systems; the DPS-1200SB is described as an ATX-format supply. A familiar brand and matching wattage do not make one a substitute for the other. Check the server service manual, existing unit label, chassis bay, connector layout, and approved part numbers. If a system calls for a Common Slot module, I would not buy the DPS-1200SB based only on the fact that it provides 1200W.
Verify input voltage before installation
The input specifications differ sharply. The DPS-1200SB is listed for 200–240V, while the Common Slot listing gives a minimum of 100V AC but does not state a maximum in the supplied details. Do not infer a complete operating range from a single minimum figure. Check the label on the exact unit and your facility’s power distribution. If the available circuit is 120V only, the DPS-1200SB’s listed range is a mismatch; if voltage support is unclear for the Common Slot model, confirm it with HP documentation or the seller.
Treat 1200W as capacity, not a compatibility guarantee
A 1200W rating tells you the stated output capacity, not whether the supply can power every server configuration. The system’s processor, accelerators, drives, memory, and peripherals affect demand, while the server manufacturer sets supported configurations and supply pairings. I would check the required wattage for the installed hardware and whether the system uses one supply or a redundant pair. A replacement also needs the correct connectors and supported signaling; wattage alone cannot verify those details.
Compare serviceability and efficiency documentation
The Common Slot kit has the clearer server-maintenance case: its listing specifies hot-swap, tool-less installation, which can simplify replacing a supported module. It also lists 80 PLUS Platinum certification. The DPS-1200SB listing does not state an efficiency certification, so I would not assume one from the product title. If the supply will run around the clock, efficiency documentation and the server’s cooling design can affect operating costs and heat, but fit and manufacturer approval still come first.
Set expectations for renewed hardware
Both models are renewed, and both have a stated 90-day warranty term, though the Common Slot listing describes a minimum warranty. That may be acceptable for a tested replacement or a short-term repair, but it offers less coverage than many buyers want for a production system. Check the seller’s condition notes, return policy, exact part number, and included accessories. For a critical server, I would also weigh the cost and availability of a new, manufacturer-supported supply against the uncertainty of refurbished hardware.
Frequently Asked Questions
Are these two HP 1200W power supplies interchangeable?
No. The 656364-B21 is a Common Slot server supply intended for compatible HP servers and storage systems, while the DPS-1200SB is listed as an ATX supply for personal computers. They differ in physical format and intended platform. I would check the server’s supported part numbers and the existing supply label before ordering; matching 1200W output is not enough to establish compatibility.
Which option is better for a compatible HP server?
For a system confirmed to use the HP Common Slot 656364-B21, I would favor that kit. It is explicitly described for compatible HP servers and storage systems, and it offers hot-swap, tool-less installation plus a stated 80 PLUS Platinum rating. The DPS-1200SB may be useful in a system that accepts ATX, but the supplied details do not establish it as a Common Slot server replacement.
Can I use the DPS-1200SB on a standard 120V circuit?
The supplied specification lists the DPS-1200SB input range as 200–240V, so I would not select it for a 120V-only circuit on that information. Confirm the voltage printed on the exact unit and the installation requirements for your system. If your power source does not fall within the documented range, choose a compatible supply with an appropriate input specification instead.
Does the DPS-1200SB have 80 PLUS Platinum certification?
The product title includes the word “Platinum,” but the supplied DPS-1200SB specifications do not list an efficiency certification. I would verify the certification against the exact model documentation or the label on the unit rather than relying on the title alone. By comparison, the 656364-B21 listing explicitly states 80 PLUS Platinum.
Is a renewed 1200W supply appropriate for a production server?
It depends on the server’s role, the cost of downtime, and the warranty and condition you are willing to accept. Both products here are renewed and carry a 90-day warranty term, which may be a reasonable fit for a noncritical replacement but provides limited coverage for a system that must remain available. For production use, I would verify the seller’s return terms, confirm the part number and test status, and compare that risk with a new, supported unit.
Conclusion
My recommendation depends on the system, not the shared wattage. Choose the HP Common Slot Platinum 1200W Kit if your HP server or storage system explicitly supports the 656364-B21 and you want hot-swap servicing with a stated Platinum efficiency rating. Choose the HP DPS-1200SB only if your compatible system requires an ATX-format supply and its power source meets the listed 200–240V range. If you cannot confirm the form factor, connectors, or input voltage, pause before ordering; neither renewed unit is a safe guess for an unknown server configuration.
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