Timetec DDR3-1866L 4GB Replacement for Synology D3NS1866L-4G Non-ECC Unbuffered SODIMM DDR3L 1866Mhz PC3L-14900 1.35V Memory RAM (Compatible for DS620slim, DS218+, DS718+, DS918+, DS418play)

£35.10 £8.78/GB

22% dearer per GB than the average 4GB DDR3 kit we track.

Laptop DDR3 Non-ECC Unbuffered

★ 4.4/5 · 220 reviews on Amazon

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Specification

Price history

Typical price (median) 90-day £27.73 12-month £27.14 12-month low £9.99 All-time low £9.99 (2025-02-25)

Dear for the market Today’s price is 29% above this kit’s typical price for the past year, and it has been cheaper than this for 70% of that year (last on 10 Aug 2026). At £8.78/GB it is dear against the £5.84/GB typical for DDR3 today. Why medians, not averages ›

30-day avg £30.5590-day avg £28.28180-day avg £28.28 (averages are pulled up by price spikes; the medians above are the better guide)

Cheaper per GB in the same spec

Same generation, capacity and form factor as this kit, ranked by £/GB. See all ›

	£/GB	Price	Capacity	Manufacturer	For	Type	Form Factor	ECC / Buffered	Description
	£2.00best £/GB	£8.00	4GB	SK Hynix	Mac	DDR3	SO-DIMM 1600MHz	Non-ECCUnbuffered	Hynix HMT351S6EFR8A-PB 4GB DDR3 1600MHz Memory ModuleBuy📈★★★★½1,602
	£2.90	£11.59★	4GB	EbidDealz	Laptop	DDR3	SO-DIMM 1600MHz	Unbuffered	Hynix HMT451S6AFR8C-PB 1600MHz PC3-12800S 204 Pin 4GB DDR3 SDRAM RAM Memory ModuleBuy📈-
	£3.03	£12.10★	4GB	SK Hynix	Server	DDR3	SO-DIMM 1600MHz	ECCUnbuffered	HYNIX 4GB RAM HMT451S6DFR8A-PB SODIMM DDR3 PC3L-12800S 1600Mhz 1Rx8 1.35v CL11Buy📈★★★★½30
	£3.25	£12.99▼ 7%	4GB	Timetec	Laptop	DDR3	SO-DIMM 1066MHz	Non-ECCUnbuffered	Timetec 4GB DDR3 1066MHz PC3-8500 Non-ECC Unbuffered 1.5V CL7 2Rx8 Dual Rank 204 Pin SODIMM Laptop Notebook PC Computer Memory RAM Module UpgradeBuy📈-
	£3.68	£14.70★	4GB	SK Hynix	Laptop	DDR3	SO-DIMM 1333MHz	Unbuffered	SKhynix Hynix 4GB 1333MHz PC3-10600S 2Rx8 SO-Dimm HMT351S6CFR8C-H9 (1x4GB)Buy📈★★★★½28
	£3.75	£14.99	4GB	Hypertec	Laptop	DDR3	SO-DIMM 1600MHz	Non-ECCUnbuffered	Hypertec H6Y75AA-HY 4GB DDR3L 1600MHz Memory Module (4GB, DDR3L, 1600MHz, 204-pin SO-DIMM)Buy📈★★★★★1

About this kit

• Replacement for an original Synology D3NS1866L-4G module
• Compatible for Synology DiskStation 20 series:DS620slim
• Compatible for Synology DiskStation 18 series: DS918+, DS718+, DS418play, DS218+
• DDR3L 1866MHz PC3L-14900 204-Pin Unbuffered Non ECC 1.35V CL13 Single Rank 1Rx8 based 512x8 Module Size: 4GB Package: 1x4GB
• Guaranteed – Lifetime warranty from Purchase Date Free technical support

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