Choosing among CPUs, motherboards & memory can go wrong at the first fork: a motherboard replacement must match the named Dell system and memory type, while a DDR5 upgrade must match the module format and specification. These four choices split into two Dell motherboards and two desktop memory modules, so the right pick depends on the machine you are upgrading-not simply the headline number.
Start with the platform, then condition and price. The Dell XPS 8940 board and Dell Precision 3650 Tower board both list DDR4, while the G.SKILL and SK hynix choices are DDR5 desktop memory with different module details.
Quick take
- For a Dell XPS 8940 repair, the Dell XPS 8940 motherboard has the most specific model pairing.
- For a Dell Precision 3650 Tower path, the Precision board combines the named tower with BIOS Unlocked and Computrace Unlocked attributes.
- For a specification-led DDR5 upgrade, compare the G.SKILL and SK hynix module details rather than treating all DDR5 memory as interchangeable.
- If price is the first filter, the table makes the full spread easy to see without turning it into a performance claim.
Listed-price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Dell XPS 8940 Desktop Motherboard Intel 10th 11th Gen LGA1200 DDR4 K3CM7 427JK | USD 161.58 | |
| Dell Precision 3650 Tower Intel W580 Socket LGA1200 Motherboard NDYHG 0NDYHG | USD 89.99 | |
| G.SKILL Ripjaws S5 32GB 1x32GB DDR5 6000 CL32 XMP 3.0 Intel Desktop Memory | USD 379.00 | |
| SK hynix Lenovo 16GB PC5-5600B UDIMM DDR5 Desktop Memory RAM HMCG78AGBUA081N | USD 234.99 |
The listed prices run from USD 89.99 to USD 379.00, an absolute gap of USD 289.01. That range spans different component types, so price should narrow the shortlist only after the system or memory specification is clear.
Decision matrix
- Named XPS 8940 replacement: Dell XPS 8940 motherboard, because the compatible model is explicitly identified as Dell XPS 8940.
- Named Precision 3650 Tower replacement: Dell Precision 3650 Tower motherboard, with BIOS Unlocked and Computrace Unlocked listed alongside its used condition.
- Single-module DDR5 specification: G.SKILL Ripjaws S5, which lists 32GB per module, PC5-48000, DDR5-6000, CL32, and XMP 3.0.
- Lenovo-labeled DDR5 UDIMM: SK hynix Lenovo memory, identified by model HMCG78AGBUA081N and a UDIMM form factor.
Product notes
Dell XPS 8940 Desktop Motherboard Intel 10th 11th Gen LGA1200 DDR4 K3CM7 427JK
The Dell XPS 8940 Desktop Motherboard is the natural starting point for a repair centered on that named Dell system. Its attributes specify compatibility with Dell XPS 8940, 10th- and 11th-Gen Intel Core processors, and the H470 chipset. The title also identifies LGA1200 and DDR4, while the connection list includes RJ-45, USB 3.1, USB 2.0, USB Type-C, M.2, SATA, PCIe, and headset ports. A 128GB maximum memory configuration is also listed. The limitation is its stated compatible model: shoppers with another system do not get the same named XPS 8940 match. Choose it when that model pairing matters most.
Dell Precision 3650 Tower Intel W580 Socket LGA1200 Motherboard NDYHG 0NDYHG
The Dell Precision 3650 Tower motherboard is aimed at a different named Dell system. It lists Intel CPU compatibility, DDR4 SDRAM memory, BIOS Unlocked, and Computrace Unlocked, giving a buyer concrete reasons to focus on it for a Precision 3650 Tower rebuild. The title also names the LGA1200 socket. Its limitation is condition: the unit is listed as used, so it does not match the new condition shown for the XPS 8940 board. The description frames it around the Precision 3650 Tower, making system matching especially important. Choose it when that tower name and the unlocked BIOS and Computrace attributes fit the repair brief.
G.SKILL Ripjaws S5 32GB 1x32GB DDR5 6000 CL32 XMP 3.0 Intel Desktop Memory
G.SKILL Ripjaws S5 gives the memory comparison a clearly specified single-module route: 32GB per module, PC5-48000 (DDR5-6000), CL32, and XMP 3.0. The description also lists unbuffered, non-ECC operation, a 288-pin DIMM form factor, and a 33mm matte-black aluminum heat spreader. Those details make it the choice to examine when the desired build calls for that exact Intel desktop memory specification. The limitation is format: the title says 1x32GB, so the package is presented as one module rather than a two-module kit. Its USD 379.00 listed price is also the highest in this comparison, which matters for a tightly defined memory upgrade.
SK hynix Lenovo 16GB PC5-5600B UDIMM DDR5 Desktop Memory RAM HMCG78AGBUA081N
SK hynix Lenovo memory is the single-stick route for shoppers seeking a Lenovo-labeled DDR5 UDIMM. The title and attributes identify one 16GB module, PC5-5600B, UDIMM form factor, and model HMCG78AGBUA081N. That gives shoppers a concrete match when those identifiers are the target. The limitation is condition and format: it is listed as open box, and the description specifies one stick rather than a multi-module package. Choose it for that specific UDIMM and model combination, not simply because it is DDR5; the G.SKILL memory also uses DDR5 but carries different listed specifications.
Final recommendation by use case
For a Dell XPS 8940 repair, choose the Dell XPS 8940 motherboard because its compatible model, Intel processor generation range, H470 chipset, and DDR4 designation are explicit. For a Precision 3650 Tower repair, choose the Precision motherboard when BIOS Unlocked and Computrace Unlocked matter and used condition is acceptable. For a single-module DDR5 choice with PC5-48000, DDR5-6000, CL32, and XMP 3.0, choose G.SKILL Ripjaws S5. For a Lenovo-labeled 16GB DDR5 UDIMM, choose the SK hynix module and account for its open-box condition. In every case, match the named system or memory specification before weighing the listed price.
