# Dell Memory Upgrade - 64GB - 4RX4 DDR4 LRDIMM 2666MHz

Dell Part A9781930

Random Access Memory (RAM) is a type of hardware that your computer uses to store information. Adding memory is one of the most cost-effective ways to improve your computer's performance.

## Media

### Why should I buy a Dell Upgrades over a third-party part?

### Tested and Verified Tier-1 OEM-Grade Parts

Ensure compatibility with Dell servers, storage and networking.

### Ease of Installation

Save time with Dell Upgrades that are shipped as kits with the necessary hardware and firmware.

### Secure Supply Chain Focus

Protect system data and integrity with parts sourced from a secure supply chain.

### Dell Tech Support and Warranties

Preserve Dell technical support and warranties—which do not support systems with third-party upgrades.

### Compatibility

This product is compatible with the following systems:

- Precision Workstation T7920
- PowerEdge XR2
- Precision Workstation T7920 XL
- PowerEdge R6415
- Precision Workstation R7920 XL
- PowerEdge R640
- PowerEdge FC630
- Precision Workstation R7920
- PowerEdge C4140
- PowerEdge FC430
- PowerEdge FC830
- PowerEdge R540
- Poweredge R830
- PowerEdge R840
- PowerEdge C6320P
- PowerEdge R730XD
- PowerEdge R630
- PowerEdge T440
- PowerEdge M640 VRTX
- PowerEdge T640
- PowerEdge MX740C
- PowerEdge R740
- PowerEdge C4130
- PowerEdge R7425
- PowerEdge R940
- PowerEdge R440
- PowerEdge M640
- PowerEdge T630
- PowerEdge C6420
- PowerEdge R730
- PowerEdge M830
- PowerEdge R930
- PowerEdge R740XD
- PowerEdge R7415
- PowerEdge R940xa
- PowerEdge MX840C
- PowerEdge M630
- PowerEdge FC640

### Memory DIMM Types

### With more memory, the faster that data and instructions can be read, written, and performed by the server.

There are three types of memory DIMMS for servers available. These DIMM types cannot be mixed in a single system, you must select the type of DIMM appropriate for your workload at the type of purchase.

- Unbuffered DIMM: UDIMM, an unbuffered, low density, low-latency DIMM that doesn't include a register or buffer chip. UDIMMs are generally used in applications requiring the lowest possible latency.
- Registered DIMM: RDIMM, a registered DIMM that provides high signal integrity -- performing parity checking to detect improper addresses or commands -- and increased performance for heavy workloads.
- Load reduced DIMMs: LRDIMM, uses a buffer to reduce memory loading to a single load on all DDR signals, allowing for greater density.

### Memory Tests

- Burn-in: Powered stress testing (i.e. increased temperature) to remove weak components.
- Component Test: Memory vendor-specific diagnostic tests performed at DRAM component level to ensure functionality.
- Module Test: Memory vendor-specific diagnostic tests performed at DIMM level to ensure functionality (with all DRAM components already mounted on DIMM PCB).