How to get Supermicro H8SCM-F to run DDR3-1866?

[HeyItsChris]

I have DDR3-1866 modules Samsung M386B4G70DM0-CMA4, 2 of them in the BLUE slots.

I was just wondering if anyone knew why they are running at DDR3-1333, instead of 1866?

Thanks

 

[ENTERPRISE]

What is the CPU rated at for supported memory speeds ?

[HeyItsChris]

Samsung M386B4G70DM0-CMA4 is RDDR3-1866, right?   Integrated peripherals / components
Memory controller	The number of controllers: 1 Memory channels (per controller): 2 Memory channels (total): 2 Supported memory: UDDR3-1866, RDDR3-1866, ULV RDDR3-1333

[ENTERPRISE]

14 hours ago, HeyItsChris said:

Samsung M386B4G70DM0-CMA4 is RDDR3-1866, right?   Integrated peripherals / components
Memory controller	The number of controllers: 1 Memory channels (per controller): 2 Memory channels (total): 2 Supported memory: UDDR3-1866, RDDR3-1866, ULV RDDR3-1333

 

Well the CPU seems to support the speeds. Have you forced the RAM to run at 1866Mhz rather than letting the BIOS assign a speed automatically? I noted in your screenshot you could force them by setting 933Mhz.

 

I know you said you have 2 of the same modules of memory, but just for sanity sake are they definitely a matched pair rated at the same speed and timings?

 

Have you tried a CMOS reset with the modules already installed in the board?

 

Does the board have the latest BIOS available?

[pio]

Isn't 933MHz clock speed = to DDR3-1866?

[ENTERPRISE]

1 hour ago, pio said:

Isn't 933MHz clock speed = to DDR3-1866?

 

Yeah, I just assume he didn't set it? or that it still did not run at that despite the setting. Either way setting it to 933Mhz would set it to 1866Mhz (Double Data Rate= 933 x2 =1866). If setting that does not work, I would expect the system to not post. Meaning a CMOS reset will be required if that happens.

[HeyItsChris]

It always ignores me setting the ram speed for some reason?  I tried cmos reset to no avail.

 

What do u think of this on my CPU, the AMD Opteron 4386 how to force it into 3.8Ghz speed?

 

[pio]

34 minutes ago, HeyItsChris said:

It always ignores me setting the ram speed for some reason?  I tried cmos reset to no avail.

 

What do u think of this on my CPU, the AMD Opteron 4386 how to force it into 3.8Ghz speed?

 

You have unsupported RAM installed from the looks of it, hence it defaulting to 1333.  You have "DDR3 LRDIMM 1866" memory.  Your CPU, being Piledriver, is about the best you can get that generation, and yes it does support 1866, but it requires the RAM to be of "UDDR3-1866 or RDDR3-1866" type.  Because you have low voltage RAM (1.50v / "LRDIMM"), its being recognized as "ULV RDDR3-1333".

This is my guess, I could be wrong.  But its definitely defaulting to the "ULV RDDR3-1333" timings and speeds.

Is the RAM on the QVL for the board as 1866?  Server parts tend to be a tad more picky about these things than desktops.

Edited April 9 by pio

[HeyItsChris]

I keep getting a freeze up while in game, why?  At about 30-35GB of committed virtual memory is when it occurs.  I can't figure it out.  What settings should improve stability of the system?  It freezes & reboots, no bsod or anything.  Is it because I have the Vega gpu undervolted to 900mv @ 1675mhz?

 

HT1 runs at 1200mhz vs stock auto is 2600mhz

 

 

Edited April 10 by HeyItsChris

[ENTERPRISE]

1 hour ago, HeyItsChris said:

I keep getting a freeze up while in game, why?  At about 30-35GB of committed virtual memory is when it occurs.  I can't figure it out.  What settings should improve stability of the system?  It freezes & reboots, no bsod or anything.  Is it because I have the Vega gpu undervolted to 900mv @ 1675mhz?

 

HT1 runs at 1200mhz vs stock auto is 2600mhz

 

 

Only way to know is remove your overclocks and re-enable them one at a time and see whe the instability starts.

[HeyItsChris]

Thanks yeah i think it was the overclock to 1675mhz at 900mv, because i reduced it to 1563mhz and its stable now so far.