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only 2 out of 4x4gb corsair vengance usable on my Asus M5A97

by basz79 / January 5, 2018 10:01 AM PST

Saw a bunch of similar problems but no solution worked for me. Maybe because they were not exactly alike.

Bought an additional 2x of 4gb corsair vengance and slotted into my Asus M5A97 R2.0.
The first pair works no probs. the second one is visible to both BIOS and Windows 8.1 but not usable.

The RAMs are fine - I switched them with the other ones and they work as 8gb just fine. It's only when all the 4 slots are taken, only the first two ones are used.

I cleared the CMOS, set the freq to 1600, vol to 1,5V, DRAM timing to 9-9-9-24 removed the max memory tick in the Win msconfig. No luck with any of that.
Any other ideas?
It feels like a motherboard/BIOS settings issue.

Much appreciated!

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Clarification Request
Try memory tests and
by R. Proffitt Forum moderator / January 5, 2018 10:07 AM PST
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Web Speccy
by basz79 / January 6, 2018 5:57 AM PST
In reply to: Try memory tests and
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RAM Web Speccy
by basz79 / January 6, 2018 6:03 AM PST
In reply to: Web Speccy
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by Bob__B / January 6, 2018 10:41 AM PST
In reply to: RAM Web Speccy

Speccy shows it's not using dual channel.

Turn off xmp and see if speccy shows dual channel.

If not remove the 2 new sticks and see if speccy shows dual channel.

If not look in the manual for the proper 2 slots to fit the ram into.

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Increasingly bizarre...
by basz79 / January 6, 2018 12:17 PM PST
In reply to: Ram


Silly question obviously, but where will i disable the xmp? been looking everywhere.

The bizarre thing now is that:

My original 2x4 is visible, usable and works with single channel as an 8 when in slots 1 and 2, even though manual suggests slotting such combination into slots 2 and 4.
When I reseat these 2x4 into slots 2 and 4, both are visible but only one usable - pretty much like my original problem with 2 x 2 x 4 - all visible, half usable. Still works on single channel.

I will play around now to make the original 2x4 be usable as 8 in the manual recommended slots, but this is very strange, i recon.

any thoughts? I am happy to attach speccys if that'd help?

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The Speccy plus a picture below
by R. Proffitt Forum moderator / January 6, 2018 12:29 PM PST

Tells me it's a hardware issue. It can be either a memory or CPU connection issue or at worst the motherboard has a flaw. I'm not convinced this is a Windows max memory setting.

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by Bob__B / January 6, 2018 1:15 PM PST

Should be in the bios.

If you have some OC app running it might also be there.

Work with 2 sticks of ram and figure out why dual channel does not function.

Is it the ram.
The slot.
The bios.

Don't put 4 sticks in the machine that just makes the water muddy.

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Clarification Request
Core speeds
by James Denison / January 6, 2018 10:50 AM PST

Why is your CPU and bus speed so slow? Your CPU can do 4Ghz and the bus speed on that motherboard can be set much faster too. You aren't using full capability of those.
Core Speed: 1404.4 MHz
Multiplier: x 7.0
Bus Speed: 200.6 MHz
Rated Bus Speed: 2207.0 MHz
Temperature: 10 °C

The speccy sees all your RAM, so Windows must be seeing it too. Are you sure it's not seeing it all? How did you come to that determination? I wonder if your BIOS ignores half the RAM when you are running it so under clocked?

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Screen shot
by basz79 / January 6, 2018 10:58 AM PST
In reply to: Core speeds
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I had a thought about that processor
by James Denison / January 6, 2018 12:29 PM PST
In reply to: Screen shot

Doesn't it have the graphics in it for onboard video and does it use half the RAM for the video and half for the processing? Did you check in the BIOS for how much RAM is shared to the onboard video?

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this is a good point as well.
by basz79 / January 6, 2018 12:45 PM PST

I'll investigate as step two, after i sort out the dual channel bit

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windows sees the RAM, but....
by James Denison / January 6, 2018 12:30 PM PST
In reply to: Screen shot

....it seems half is assigned to something else.

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Or it found it to fail as some address
by R. Proffitt Forum moderator / January 6, 2018 12:33 PM PST

It wasn't long ago that Microsoft figured out that folk want the PC to work even if flawed. So automatically can reduce RAM in situations.

A bootable RAM TEST would be next.

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Yeah, it does seem
by basz79 / January 6, 2018 12:44 PM PST
In reply to: maybe this

to be quite an issue often.
I have seen this post earlier but will re-read. Got a lot of hints from across the place. Will focus now on making one pair of my RAMs to work on dual channel and will take it from there.
There goes my weekend.

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Clarification Request
Have you checked this in the UEFI BIOS?
by James Denison / January 6, 2018 11:04 AM PST


ASUS UEFI BIOS offers the first mouse-controlled graphical BIOS designed with selectable modes, providing a user-friendly interface that goes beyond traditional keyboard-only controls. It also natively supports fully-utilized hard drives larger than 2.2TB in 64-bit operating systems.

ASUS Exclusive Interface
EZ Mode displays frequently-accessed info. Users can choose system performance settings and drag and drop boot priorities. Advanced Mode for performance enthusiasts includes detailed DRAM settings via a dedicated memory info page for complete insight.

New Upgrade! Quick and Easy Info for Enhanced System Control

F12 BIOS snapshot hotkey for sharing UEFI setup info and troubleshooting
New F3 Shortcut for most accessed info
ASUS DRAM SPD (Serial Presence Detect) Information for accessing memory info, detecting faulty DIMMs and helping with difficult POST situations

All Answers

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by Bob__B / January 5, 2018 10:14 PM PST

If you put all 4 sticks in the machine the bios sees 16GB of ram?
Windows sees 16GB of ram?

What do you mean by not usable?

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Re: Useable
by basz79 / January 6, 2018 5:46 AM PST
In reply to: Useable?

That's what my BIOS and Win are showing:
I'm trying different voltages, timings and frequencies but to no avail so far.
What baffles me is that clearly the new 2 RAMs is ok, as they work by themselves and are also visible by both BIOS and Win. But i can't seem to make them useable.
Appreciate any further hints.

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BIOS and Win Screenshots
by basz79 / January 6, 2018 5:47 AM PST
In reply to: Useable?
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by Bob__B / January 6, 2018 10:10 AM PST

It's too small to read.
If I try to magnify it it just turns into a blur.

See if you can figure out some way to post something readable.

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by basz79 / January 6, 2018 10:13 AM PST
In reply to: Sorry
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by Bob__B / January 6, 2018 10:56 AM PST
In reply to: Speccy

See my answer above.

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Armed with your Speccy (thank you for that)
by R. Proffitt Forum moderator / January 6, 2018 9:43 AM PST

We see this is not a new question (which is fine here.)

Read over https://www.google.com/search?q=M5A97+R2.0+(Socket+942)+usable+ram+site:www.tomshardware.com&client=opera&hs=wpF&sa=X&ved=0ahUKEwiTvqjg8MPYAhWhiVQKHTQeCl4QrQIIOygEMAE&biw=1880&bih=970

There are only a few posts to go over but you'll find bent pins, BIOS settings and maybe more.

I suspect bent pins since the memory is in single channel mode. Just me guessing here. Would have to get the machine and the CPU and socket under a microscope to be sure.

Again, thanks for the pictures and Speccy.

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Bent pins fixable?
by basz79 / January 6, 2018 10:09 AM PST

Thank you, mate, for your advice and guiding to Speccy in the first place. Didn't know of it - what a useful programme.

As to bent pins - is that something one can repair?

Both sets of memoty work well if I slot them into slot 1 and 2. Would that logically then mean that there's a faulty pin in the 3rd or 4th RAM slot? Still, the memory is recognised by the card, but unuseable.

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The connection of memory to the CPU
by R. Proffitt Forum moderator / January 6, 2018 10:35 AM PST
In reply to: Bent pins fixable?

Is done in the CPU so with your test of slots, it tells us that the memory connection can have bent pins or back at the CPU or not much a stretch, bad motherboard.

The problem here is that I can't tell you where the issue is but it does not appear to be OS or BIOS related.

Also how I work this is with a microscope. The only good news is that there are now cheap ones that let me get into the machine without having to pull the motherboard. Example:

There's also a possible cheat here. Install a pair of 8GB sticks. I can't assure you that will work, but the chances are high.

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