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Synology SO-DIMM 8GB DDR4 ECC Memory Module - NAS Server (D4ES01-8G)

Reserved for the RS1221RP+, RS1221+, DS1821+, DS1621xs+ and DS1621+ NAS units, clocked at 2666 MHz, in a short, unbuffered format.

  • Compatible NAS: RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+
  • Error correction (ECC): errors are corrected on the fly, data protected
  • Frequency 2666 MHz
  • Short SO-DIMM format, unbuffered
  • DDR4 generation, not compatible with a DDR5 slot
Ref.: D4ES01-8G
Synology SO-DIMM 8GB DDR4 ECC Memory Module - NAS Server (D4ES01-8G) — image 1
Synology SO-DIMM 8GB DDR4 ECC Memory Module - NAS Server (D4ES01-8G) — image 2

Non-contractual photos

The visuals on this page are supplied by the manufacturer. They are frequently produced for a whole range — not for the exact model you are viewing: what you see in the photo is never a promise of what is included.

No exchange, return or cancellation will be accepted on the grounds that something seen in a photo (accessory, port, colour, keyboard layout, packaging…) is not found on the delivered product. Only the specifications written on the page are binding for the order.

What the image does not guarantee:

  • Design and revisions : one component is produced by several partner manufacturers: cooler, backplate, RGB lighting and printing change with the version delivered.
  • Quantity : an image showing two memory modules or several fans does not mean the set is sold that way — check the packaging in the specifications.
  • Cooling : a processor may be sold without a cooler, and not all the fans visible inside a case are supplied.
  • Accessories : cables, adapters, screws, brackets and software licences are supplied only if the specifications say so.
  • Colour : one image often serves several colours, and the shade you see depends on studio lighting as much as on your screen settings; the colour sold is the one in the title and the specifications.
  • Props and accessories : the items shown around the product (cables, stands, decorative objects, content displayed on screen) are not included unless explicitly stated.
  • Packaging : boxes, labels and bundles change with the manufacturer's revisions: the packaging delivered may differ from the one in the photo.

What is binding: the product title, this page's technical specifications, the description and, when provided, the manufacturer's PDF datasheet available in the downloads.

The slightest doubt about a specification? Contact us before ordering and we will check for you.

(+212) 05 30 31 64 21+212 6 64 10 46 24service.client@iris.ma

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2 499,00 DHincl. VAT

Limited quantity

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Receive it between Wed 23 Sept and Fri 25 Sept — delivery 40 DH incl. VAT all over Morocco

Delivery to your address

Receive it between Wed 23 Sept and Fri 25 Sept — delivery 40 DH incl. VAT all over Morocco

The estimate is refined using actual delivery rounds to your city.

  • Free delivery from 3 000 DH of purchases, all over Morocco.
  • Below that, the same rate in every city for parcels up to 30 kg (delivery to your home or workplace) — the exact amount is shown above, then in the basket.
  • Above 30 kg, the rate follows the parcel's weight. In Casablanca, the flat rate holds up to 120 kg.
  • You are notified by SMS, then called by the courier before your parcel is handed over (delivered by Sapress).
  • Observed delivery time: 1 to 5 working days depending on the city.
Free in-store collection: Casablanca (within 24 h) · Témara (within 48 h)

In-store collection — free

Casablanca store
We bring it to the store within 24 h
We call you as soon as it arrives in store.

Résidence Manoir des Roses, Lot. 18, Boulevard El Hachmi El Filali, Rond-point Bachkou, Casablanca

Opening hours

  • Mon–Fri: 10am – 7pm
  • Sat: 10am – 2pm
  • Closed on Sundays and public holidays

Payment on site: cash, bank card via terminal, certified cheque.

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Temara pickup point
We bring it to the store within 48 h
We call you as soon as it arrives in store.

Boulevard Hassan II, Résidence Les Perles de Témara, Immeuble 5, appartement 2, Témara

Opening hours

  • Mon–Fri: 8.30am – 1pm / 2pm – 6pm
  • Sat: 8.30am – 12.30pm
  • Closed on Sundays and public holidays

Payment on site: cash, bank card via terminal, certified cheque.

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1 year warranty — free repair in Morocco if it breaks down during the warranty period

1 year manufacturer's warranty

This product is covered for 1 year by a manufacturer's warranty (the brand's official warranty). Your iris.ma invoice serves as the warranty document: keep it safe.

A problem with your product? Don't worry: contact us by phone, WhatsApp or e-mail. Depending on the brand, we direct you either straight to the repairer appointed by the brand to fix your product, or to us — and we take care of the rest.

  • If a repair is possible, it is carried out free of charge.
  • If the product cannot be repaired, the brand offers an exchange for another product.
  • If no product is available, a refund is issued as soon as the brand confirms it.

Faulty straight out of the box? Some brands offer an immediate exchange, others a repair. Contact us to find out what applies to your product.

The warranty covers breakdowns occurring under normal use, as defined by the brand's terms. Product breakage (drop, impact, liquid…) is not covered, nor are certain consumable parts.

(+212) 05 30 31 64 21+212 6 64 10 46 24service.client@iris.ma

New, never opened — our commitment

All our products are new, delivered in their sealed original packaging.

We commit to never sending you a product that has been opened, unboxed or returned by another customer — even one “just opened for checking”.

Any doubt on delivery (damaged box, seal already opened)? Point it out to the courier or contact us immediately: we take the product back and send you another one.

Sales invoice

Every order comes with its sales invoice, included with the parcel (handed over in person for a store collection).

Ordering for a company? Using the details you give at checkout (company name and ICE), the invoice is issued in your company's name, with its ICE.

Need a quote? Request a free quote — reply within 24 working hours.

100% secure payment: Bank transfer · Bank card · Cash on delivery (deposit of 370 DH by card or bank transfer) · Certified cheque

Accepted payment methods

Bank transfer

Simply transfer the amount shown to account 007 826 0002684000000426 89 — SGM2I, Attijariwafa bank. The rest (the reference to quote, sending us the proof, tracking) is explained right after confirmation and by email. An instant transfer is recommended: it saves you 24 hours on the delivery time.

Bank card

Your everyday Moroccan bank card is enough — Visa, Mastercard or CMI, no special card required. Foreign cards are accepted too. Secure payment by Attijari Payment.

Cash on delivery (deposit of 370 DH by card or bank transfer)

Pay 370 MAD up front by card, then 2 129 MAD in cash on delivery. The deposit is not refunded if you cancel your order.

Certified cheque

Certified cheque payable to “sgm2i”. Have your bank certify the cheque, then send us a copy on WhatsApp (+212 6 64 10 46 24) or to service.client@iris.ma — we dispatch as soon as we receive it.

Cash at a bank branch

Pay the cash in at any of the 3,400 Attijariwafa Bank branches in Morocco, to the SGM2I account no. 0268 D 000 000 426. You do not need an account there: your ID and the cash are enough.

The methods offered depend on the order total and the carrier — checkout shows the final list.

Google reviews4.7(553 reviews)

Product overview

Improve the performance of your NAS server with the Synology SO-DIMM 8GB DDR4 ECC memory module. This DDR4 ECC Unbuffered SODIMM provides 8GB of capacity for smooth running of your critical applications and services. Compatible with a range of models, including the RS1221RP+, RS1221+, DS1821+, DS1621xs+ and DS1621+, it delivers reliable, fast data handling. Maximise the efficiency of your storage system without compromising on security or stability.

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Technical specifications

Technical specifications
ECC supportYes
Capacity8 GB
Module capacity8 GB
Frequency2,666 MHz
Form factorSO-DIMM (short module)
DDR generationDDR4
Technical specifications (continued)
Buffered memory (registered)Unbuffered
Memory module typeSO-DIMM
Compatible machineServer and NAS
Compatible modelsSynology NAS RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+
PackagingSingle module
Warranty1 year

Specific references

EAN4711174724055

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Frequently asked questions about this product

Which Synology NAS models accept this D4ES01-8G module?
The RS1221RP+, RS1221+, DS1821+, DS1621xs+ and DS1621+. Check the model printed on your NAS before ordering: the compatibility list varies from one Synology reference to another.
What does ECC error correction bring to a NAS?
Memory errors are corrected on the fly, which protects the data being processed. On a NAS that is always on, it is the difference between an error caught in time and a corrupted file.
What is the exact format of this Synology 8 GB memory?
A short, unbuffered SO-DIMM, which fits into the NAS's internal slots. It is neither the full-length module of a desktop PC nor a registered server module.
Will this DDR4 module fit in a DDR5 slot?
No: the two generations do not have the same connector. On the NAS models on the compatibility list, DDR4 is indeed what you need.
What frequency does this Synology memory run at?
2,666 MHz. On a NAS, frequency matters less than the amount of memory available and the presence of ECC: these are what determine how many services the machine can run in parallel.
Is this Synology 8 GB ECC module new and under warranty?
Yes, it is a new Synology product, reference D4ES01-8G, barcode 4711174724055. The invoice serves as the warranty document, for 1 year. Keep it in case a defect is found.

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