DDR4 4 items

Desktop lines in this catalogue run to 16 GB per module in DDR4. Desktop modules are unbuffered: the memory controller addresses the DRAM packages directly, with no register or buffer in between. That keeps latency low and cost down, and it also caps how many ranks a channel will drive, which is why the practical capacity ceiling in a desktop or workstation board is reached sooner than in a server platform accepting registered modules. Where error correction matters, it is the platform — board and processor — that decides whether ECC modules can be used at all, because ECC must be supported along the whole path rather than by the module alone.

Speed and rank are the two attributes that most often decide whether a kit behaves as expected. Installed speed is negotiated downward when the platform or the rest of the channel cannot run at the module's rating, and rank count affects how many modules a channel will accept at full speed. Send the board and processor model with the capacity you are aiming for and we will read the lot against it rather than guessing from the listing. If you are replacing existing modules, tell us what is fitted now, because mixing ranks across a channel can change the speed the platform settles on.

Each listing is a distinct physical lot rather than a catalogue line, and opens onto its own page with the full specification: SKU, capacity, form factor, speed, condition, quantity and price. The SKU identifies the exact part, the condition field states how that stock was graded, and the availability field reflects what was recorded at the last stock review. Where a unit price is shown, it is the FCA Shenzhen price for the standard tested grade at quantity one. Where a listing reads "Request quote", unit pricing depends on the quantity, the grade and the delivery address, and is issued in writing rather than published.

Part numbers that do not appear here are supplied on request from our Shenzhen stock. The list shows what is palletised today; everything else in the range is quoted against a confirmed enquiry. If you are looking for a specific part number, send it with the quantity you need and we confirm the lot, the grade and the shipping window.

3 grades appear in the condition column, and the difference between them is a difference in who carries the risk rather than in whether a part works:

• New — factory-new and sealed. Lowest risk, highest cost, and any manufacturer warranty passes through unchanged.
• Refurbished — cleaned, inspected and functionally verified before packing. Cosmetic wear is normal and does not affect operation.
• Pulled and tested — removed from decommissioned equipment and functionally verified by us. The usual choice when working parts are needed at a fraction of new cost and normal signs of prior use are acceptable.

Because grade drives both price and risk, it is restated on every written quotation rather than left to interpretation from the listing.

The grade is stated on the listing and restated on the written quotation, because it is the grade that decides how much of the risk sits with us and how much sits with you.

Enquiries are answered within 2 hours during Shenzhen business hours. Lots are supplied from Shenzhen and can be inspected before shipment. Buyers based locally, or travelling through, can arrange a visit; remote buyers can request photographs and test records for the specific lot before committing. A quotation is valid until the end of the business day on which it is issued (China time), and a quotation is not an order — an order begins when you confirm the lot and the destination.

Lead time is confirmed against the lot and the destination rather than assumed. Where stock is on hand and the destination is served directly, dispatch follows cleared payment. Where the quantity exceeds what is on hand, we supply against the confirmed order and state the expected window in the quotation. Documentation, packing and any certification the destination requires are confirmed per order, and the part numbers quoted are the part numbers shipped.