New box, memory problem

[compdoc]

>Hmmmm... if not stable, then not a good way to tell if those slots 
>are actually working properly on the MB

You never know until you try what will work, but best to go by the manual. 

> mem is 1600 - need to go down from there?

No, I meant the highest two speeds that the board supports. 1600 is perfect.


> AMD FX6350

I have an FX4300 running KVM on Ubuntu Server. It doesn't support higher
than 1600. 

 > Might a bent pin cause this, when it seems to run quite well with one mem
pair?

Messing with the cpu is last resort. In many boards, you can use either
slots 1&3 or 2&4 with one pair of dimms. If the pair work in either sets of
slots, then nothing wrong with the cpu/bus.

Ive seen ram that works on AMD boards, but not on Intel boards. There's a
reason you can google, but I don't remember what it is. 

Some brands ram will work better/faster on the same board than other brands.
Have many sets of different brands of modules allows me to test these
things.

If I had to guess I'd say it was the ram compatibility at this point. Do you
use the amd or other Profile type enabled? Some boards have two kids. Try
them all.

The board should work with one pair of 8G, and one pair of 4G, sure. But
then it's supposed to work with four 8G modules. Try like heck to get
matching brand and model.

Hopefully the PSU is new and of sufficient power. And all 4pin and 8pin
power connectors on the motherboard have power cables inserted. 







-----Original Message-----
From: ubuntu-users-bounces at lists.ubuntu.com
[mailto:ubuntu-users-bounces at lists.ubuntu.com] On Behalf Of rikona
Sent: Friday, September 30, 2016 10:48 PM
To: compdoc at hotrodpc.com; Ubuntu user technical support, not for general
discussions
Subject: Re: New box, memory problem

Hello compdoc,

Friday, September 30, 2016, 5:36:08 PM, compdoc wrote:

>> If I put one pair in 2&4 with 1&3 open, might that damage the MB?

> won't damage it, but it might not boot or be stable. OK to try, though.

Hmmmm... if not stable, then not a good way to tell if those slots are
actually working properly on the MB.

> Make sure no dirt or hairs are in the memory slots.

All brand new, spotless, air jet cleaned.

> When using the maximum amount of ram, not all boards support the 
> maximum speed the ram is rated for. You might need to set for a lower 
> speed like 1600 before adding all dimms, and then try setting the 
> proper speed.

mem is 1600 - need to go down from there?

> You can also try clearing the cmos after installing all dimms.

I'll try it...

> Make sure the slots you are calling 1&3 and 2&4 are shown that way in 
> the manual.

Yes - checked that carefully. :-)

> You don't mention the cpu,

AMD FX6350

> ram speed,

1600 ddr3 2x8G pairs - I have 2 pairs [looks like 32G in ddr3 comes as
4 items, not 2].

> if the dimms are all the same brand and model,

Same brand, very similar model, but NOT exactly the same, as reported by
memtest. [Patriot Viper]

> or if the bios is the newest version for the board.

Yes, was downloaded.

> A.6 is the last bios shown on the MSI support page. Updating the bios 
> can fix weird problems like these, but

> before flashing run memtest86 for one pass.

Ran both pairs, separately, and were OK. Errors if run together [all 4].

> I have also seen a sliver of thermal paste get under the cpu and stop 
> a pci-e slot from working in x4 or x8 mode.

Good thought... used the CPU pad, though, no paste.

> No reason something like that, or even a bent cpu pin couldn't cause 
> this problem.

Might a bent pin cause this, when it seems to run quite well with one mem
pair?

I saw a comment that AMD mem processors are finicky when fully loaded.
Is this true and/or a possible cause? If so, would adding ANY second pair,
even if smaller mem, still be a problem? I'd settle for a reliable 24G if 32
won't work. Would like more than 16, though...

Thanks for the many suggestions!

-- 

 rikona        


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