RAM Running at 2400 MHz

[Shaman_Daniels]

Hello everyone.

I have written about this problem before.
I have 16 GB RAM 2666 (1 piece, such a configuration):

This is the standard memory that was included PC. Connected to the following slot:

AIDA shows that it works at a frequency of - 2400:

As I was told earlier, this is normal to single-channel and you need to install a second module for dual-channel mode. Which is what I did. I managed to find exactly the same memory module.

Now, they are set as follows:

And it seemed that everything was fine, the system showed a 2-channel operating mode, BUT, all the same, the frequency was 2400, not 2666(

What could be wrong?

[NonSequitur777 · Accepted solution]

@Shaman_Daniels,

Welcome to our HP Community forum!

Summary: RAM Speed Behavior on HP EliteDesk 705 G4 SFF:

1. CPU:

   • AMD Ryzen 3 Pro 2200G

   • Could support up to 2933 MHz as per specs: https://www.techpowerup.com/cpu-specs/ryzen-3-pro-2200g.c4041.

2. Your System:

   • HP EliteDesk 705 G4 SFF

   • Officially supports up to 2666 MHz DDR4 -regardless of what the CPU can handle

   • HP’s BIOS imposes a max of 2666 MHz, consistent with JEDEC specs and business-class stability goals

3. Your RAM:

   • 2×16GB Hynix HMA82GU6JJR8N-VK

   • Rated at 2666 MHz, but observed to run at 2400 MHz

   • Confirmed dual-rank

4. Testing Outcome:

   • Even a single 16GB stick (same model) runs at 2400 MHz, not 2666 MHz

---

What’s Really Going On?

The RAM speed drop to 2400 MHz is due to:

DIMM Rank and Size:

• The 16GB Hynix modules are dual-rank, which places more electrical load on the memory controller and motherboard traces.

• HP’s BIOS likely downclocks to 2400 MHz for system stability when dual-rank modules are used, even in single-channel configurations.

 

HP BIOS Behavior (Non-XMP, JEDEC-Only):

• The EliteDesk 705 G4 SFF uses a locked-down BIOS that:

  • Does not support XMP profiles

  • Sticks strictly to JEDEC defaults

  • Applies conservative auto-speed logic based on DIMM type, density, and rank

 

UserBenchmark Trends:

• https://www.techpowerup.com/cpu-specs/ryzen-3-pro-2200g.c4041

• Most systems reporting 2666 MHz use 2×8GB single-rank modules

• No systems observed using 16GB sticks at 2666 MHz in the UserBenchmark dataset

---

Bottom Line:

Configuration RAM Speed

2×8GB single-rank @ 2666 MHz	✅2666 MHz
1×16GB dual-rank @ 2666 MHz	⛔2400 MHz
2×16GB dual-rank @ 2666 MHz	⛔2400 MHz

---

Final Conclusion:

Although the Ryzen 3 Pro 2200G supports 2933 MHz in theory, the HP EliteDesk 705 G4 SFF caps memory speeds at 2666 MHz, and further downclocks to 2400 MHz when dual-rank 16GB DIMMs are used, even individually. This is expected behavior for HP’s business-class systems using JEDEC-only BIOS behavior and strict validation profiles.

The best performing Userbenchmark 2x8GB RAM kits observed:

2x8GB Samsung M378A1K43DB2-CTD
2x8GB Hynix HMA81GU6CJR8N-VK
2x8GB Micron 8ATF1G64AZ-2G6E1
2x8GB Kingston Fury KF2666C16D4/8G

If you want 32GB total RAM, use 4x8GB RAM sticks.

Kind Regards / З повагою,

NonSequitur777