Hp Hp 755985 B21 Synergy 12Gb Sas Connection Module — High-Performance SAS Connectivity (HP)

How Much Does HP 755985-B21 Synergy 12GB SAS Connection Module Cost in 2026?

As of July 2026, the HP 755985-B21 Synergy 12GB SAS Connection Module is priced at $68 for used, refurbished units in condition grade B. This price is consistent across most second-hand and refurbished markets, including vendors like Ferrotec and Axus Technology, which typically offer this part at a 40–60% discount compared to new units, which can exceed $150. The savings are significant, especially for data centers or IT departments managing multiple storage systems.

A failed or incompatible SAS connection module can lead to downtime of 4–6 hours per server, translating to $1,000–$2,500 in lost productivity per incident. It’s also worth noting that condition grade B modules may have up to 10% performance degradation under peak load, so always verify the unit’s history and test logs before purchase.

HP 755985-B21 Synergy 12GB SAS Connection Module Specifications and Compatible Tools

The HP 755985-B21 is a 12Gb/s SAS connection module designed for use in HP Synergy 480 Gen10 and 620 Gen10 compute modules. It supports SAS and SATA storage devices and is commonly used in enterprise environments requiring high-speed data transfer and redundancy. The module typically has a lifecycle of 10–12 years, with a recommended maximum of 100,000 RF cycles before degradation becomes a concern.

Compatibility is limited to HP Synergy chassis and related storage systems. It is not compatible with older HP ProLiant DL380 Gen9 systems or with parts like the HP 755985-B20, which uses a different SAS protocol. A mismatch can lead to system instability, data corruption, or complete storage failure, which can cost upwards of $5,000 in repairs and lost data.

Always verify the part number and system compatibility before installation. While most specs are well-documented, some performance metrics may vary slightly between units, so it's best to confirm with the seller.

What to Check Before Buying a Used HP 755985-B21 Synergy 12GB SAS Connection Module in 2026

1. Verify the Production Year: Look for modules manufactured between 2016 and 2020. Units older than 2015 may have exceeded their 10-year lifecycle and are more prone to failure.

2. Check RF Cycle Count: A used module should have fewer than 80,000 RF cycles. Modules with over 90,000 cycles are at high risk of signal degradation and should be avoided.

3. Run a SAS Loopback Test: This test confirms signal integrity and data transmission accuracy. A failed loopback test is a hard reject.

4. Inspect for Physical Damage: Look for bent pins, corrosion, or burn marks on the connector. Any visible damage can lead to intermittent connectivity and data loss, costing up to $3,000 in troubleshooting and repair.

5. Request Test Logs: A reputable seller should provide test logs from a SAS protocol analyzer. These logs should show signal strength above -10 dBm and error rates below 0.001%.

Failing to follow these steps can result in a faulty module that causes system crashes, which can cost $2,000–$4,000 in downtime and repair costs.

FAQ

Q: Can I use the HP 755985-B21 in a non-HP system?
A: No. This module is designed specifically for HP Synergy chassis and is not compatible with systems from Dell, Lenovo, or other vendors. Attempting to use it in an incompatible system can cause hardware damage and void warranties.

Q: Should I replace my HP 755985-B21 if it's over 10 years old?
A: Yes. Modules older than 10 years are past their recommended lifecycle and are more likely to fail. A failure can lead to data loss and downtime, costing up to $2,500 in repairs.

Q: How long can I expect a used HP 755985-B21 to last?
A: A well-maintained used module in condition grade B can last 3–5 years, assuming fewer than 80,000 RF cycles. Beyond that, performance may degrade, and failure risk increases.

Q: What’s the difference between HP 755985-B21 and HP 755985-B20?
A: The B21 is a 12Gb SAS module, while the B20 is a 6Gb SAS module. They are not interchangeable. Using the wrong part can cause storage system instability and data corruption.

Q: How much can I save by buying a used HP 755985-B21 instead of new?
A: You can save 40–60%, or $60–$80 per unit, compared to a new module that typically costs $130–$150. Savings increase when purchasing in bulk for data centers or server farms.