Hi BogDan,
Run *dmidecode* and search for "Interleaved Data Depth" to check if the ram is running in quadchnnel mode you (check https://unix.stackexchange.com/questions/215206/detect-number-of-ram-channel... for more info on this matter). In your case you should have two "Interleaved Data Depth: 4"
Unfortunately, it seems like coreboot does not supply this in dmidecode (I X'd out the serial numbers):
Handle 0x0006, DMI type 16, 23 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: Single-bit ECC Maximum Capacity: 256 GB Error Information Handle: Not Provided Number Of Devices: 16
Handle 0x0007, DMI type 17, 40 bytes Memory Device Array Handle: 0x0006 Error Information Handle: Not Provided Total Width: 72 bits Data Width: 64 bits Size: 8192 MB Form Factor: DIMM Set: None Locator: NODE 0 DIMM_A1 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Registered (Buffered) Speed: 667 MHz Manufacturer: Samsung Serial Number: XXXXXXXX Asset Tag: Not Specified Part Number: M393B1K70DH0-YK0 Rank: 2 Configured Clock Speed: 667 MHz Minimum Voltage: 1.35 V Maximum Voltage: 1.5 V Configured Voltage: 1.35 V
Cheers, Daniel