Premium DDR3 Server Memory Solutions
DDR3 ECC RAM comes in three module types, registered DIMMs (RDIMMs), ECC unbuffered DIMMs (UDIMMs) and load-reduced DIMMs (LRDIMMs), rated at 1066, 1333, 1600 or 1866 MT/s and with low-voltage DDR3L (PC3L) versions. Dell's PowerEdge R720 supports all three types at 800 to 1866 MT/s but does not allow them to be mixed, so match the type already in the server. We test every DDR3 module in our lab before shipping it.
-
Hynix HMT42GR7AFR4A-PB 16GB DDR3L-1600 PC3L-12800R 2Rx4 Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock - Hynix HMT42GR7BMR4A-G7 16GB DDR3L-1066 PC3L-8500R 4Rx4 ECC Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Hynix HMT42GR7MFR4C-PB 16GB DDR3-1600 PC3-12800R 2Rx4 ECC Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Hynix HMT151R7BFR4C-H9 4GB DDR3-1333 PC3-10600R 2Rx4 Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Hynix HMT151R7TFR4C-H9 4GB DDR3-1333 PC3-10600R 2Rx4 Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Samsung M393B4G70BM0-YF8Q8 32GB DDR3L-1066 PC3L-8500R 4Rx4 Server Memory ModuleAvailability: Available by QuoteManufacturer: Samsung Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Hynix HMT31GR7CFR4C-PB 8GB DDR3-1600 PC3-12800R 2Rx4 ECC Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Hynix HMT31GR7EFR4A-PB 8GB DDR3L-1600 PC3L-12800R 2Rx4 ECC Server Memory ModuleAvailability: Available by QuoteManufacturer: Hynix Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Micron MT72KSZS2G72PZ-1G1M1 16GB DDR3L-1066 PC3L-8500R 4Rx4 Server Memory ModuleAvailability: Only 1 leftManufacturer: Micron Condition: Refurbished 1 Year WarrantyRequest Pricing
- Samsung M393B1G73QH0-YK0 8GB DDR3L-1600 PC3L-12800R 2Rx8 Server Memory ModuleAvailability: Available by QuoteManufacturer: Samsung Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Samsung M393B2K70CM0-CF8 16GB DDR3-1066 PC3-8500R 4Rx4 ECC Server Memory ModuleAvailability: Available by QuoteManufacturer: Samsung Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- HP 664691-001 8GB DDR3-1600 PC3-12800R 1Rx4 ECC Reg Server Memory ModuleAvailability: Available by QuoteManufacturer: HPE Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
DDR3 server module types and voltages
DDR3 server memory comes as registered, load-reduced and ECC unbuffered DIMMs, and each type can come in a low-voltage DDR3L version. Micron describes its 1.35V DDR3L devices as a low-voltage version of 1.5V DDR3 that is backward compatible to 1.5V operation, and Dell's PowerEdge R720 supports both voltage specifications but lists lower top speeds at 1.35V: one registered DIMM per channel runs at up to 1866 MT/s at 1.5V and up to 1600 MT/s at 1.35V.
| DDR3 speed | Peak module bandwidth | Voltages | Processor families rated for it |
|---|---|---|---|
| DDR3-1066 | 8.5 GB/s | 1.5V, or 1.35V on DDR3L | Xeon 5600 |
| DDR3-1333 | 10.7 GB/s | 1.5V, or 1.35V on DDR3L | Xeon 5600; Xeon E5-2600 |
| DDR3-1600 | 12.8 GB/s | 1.5V, or 1.35V on DDR3L | Xeon E5-2600 and E5-2600 v2 |
| DDR3-1866 | 14.9 GB/s | 1.5V on the R720 at full speed | Xeon E5-2600 v2 |
Bandwidth is the transfer rate times eight bytes, and it is the figure in the PC3 bandwidth names, so PC3-12800 is DDR3-1600. Intel lists DDR3 for the Xeon 5600 family across three memory channels and for the E5-2600 v2 family across four.
DDR3 limits on a 12th-generation PowerEdge
Dell's PowerEdge R720 manual caps how many DDR3 modules of each type a memory channel takes:
- Up to two ECC UDIMMs per channel.
- Up to three single- or dual-rank RDIMMs per channel, or up to two quad-rank RDIMMs.
- Up to three LRDIMMs per channel, whatever their rank.
- No LRDIMMs on an R720xd with 3.5-inch drives, because of thermal limits.
The same manual rules out mixing UDIMMs, RDIMMs and LRDIMMs in one server, so match the type already installed. These servers take Xeon E5-2600 and E5-2600 v2 processors; see Xeon E5-2600 v2 processors. For DDR4 servers, see DDR4 memory; DDR2 and FB-DIMM modules are under other memory, every generation is on server memory, and ECC is covered in our guide ECC vs non-ECC memory.
DDR3 ECC RAM questions
- Can DDR3 ECC server RAM be used in a desktop?
- Registered DDR3 cannot. Per Micron, registered modules suit only boards that support registered memory, such as server boards, and do not work where unbuffered DIMMs are expected, as they are on desktops. DDR3 ECC unbuffered modules are a separate class and need a board that lists ECC UDIMM support. Check the module type on the label before reusing server memory elsewhere.
- DDR3 vs DDR3L: what is the difference?
- Voltage. DDR3 runs at 1.5V, and DDR3L is Micron's 1.35V low-voltage version that is backward compatible to 1.5V operation. A server that supports both, such as Dell's R720, can run DDR3L at the lower voltage but lists lower top speeds there, 1600 MT/s at 1.35V against 1866 MT/s at 1.5V for one registered DIMM per channel.
