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post #10771 of 13131
Quote:
Originally Posted by incurablegeek View Post
OK, it's the PITA Duck here trying to profit from Kahbrohn's misery.

Why are most stand-offs made of brass? Agree, brass is not as conductive as copper, but it is still conductive.

So wouldn't the brass standoffs that most of us use short out a motherboard almost as would direct contact to the case or a case w/out a mobo tray?

The reason I ask is that I am building two computers for friends (yes, I do have friends ) and the cases I purchased do not have trays.
Conductivity to the case as a ground is a good thing! The case can act as a shield helping to prevent EMI/RFI induced onto the mobo. That is why the pcb has ground contacts on the bottom & top of the mobo at the holes for screw mounting of the mobo. The side panels have little fingers with bumps or similar for the ability to get good conduction so all the case parts are "grounded" and/or helping with the protection.

Conductivity isn't so critical in this instance so the low grade metal is more than sufficient for the purpose at hand. Some brass connectors are brass plated rather than solid brass or vice versa, mostly in relevance to production costs control. (whew what a mouthful).

Bit of "useless" information: the exterior of a wire is what conducts electric. Solid wire, of the same gauge as stranded wire, of the same metal, is less conductive than the stranded wire.

For those that know (Stripes) "Army Training, Sir".
Edited by SgtHawker - 8/9/11 at 8:26pm
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post #10772 of 13131
Awesome movie Stripes. One of my favorite Bill Murray/Harold Ramis flicks.

~Ceadder
 
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post #10773 of 13131
Quote:
Originally Posted by incurablegeek View Post
OK, it's the PITA Duck here trying to profit from Kahbrohn's misery.

Why are most stand-offs made of brass? Agree, brass is not as conductive as copper, but it is still conductive.



So wouldn't the brass standoffs that most of us use short out a motherboard almost as would direct contact to the case or a case w/out a mobo tray?

The reason I ask is that I am building two computers for friends (yes, I do have friends ) and the cases I purchased do not have trays.

(Damn! I just noticed that someone actually upped my Rep to 10! Did I really, truly say something noteworthy or was it simply a kind gesture rooted in pity?? )
brass is good because it not eclectically corrosive from electrical arcing this helps maintain good contact

all 9 motherboard mounting holes must have good contact with the motherboard tray and/or case
Edited by Tweeky - 8/9/11 at 10:03pm
    
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post #10774 of 13131
Quote:
Those standoffs are grounding spots, more or less.
Aha! So I'm safe then on this new case w/out motherboard tray to just lay the motherboard on those stands that appear to be screw-in points just like stand-offs? (damn that was a crappy description but it is a bit late in the eve)

Quote:
I'm not entirely sure that all standoffs are brass though.
Quite true. Some of them appear to be plastic (does not conduct) as well, though most offerings do seem to be brass (does conduct).
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post #10775 of 13131
I actually came across this page which is fairly good at helping anyone to "prevent/avoid" grounding or shorting. Yes, I took the image from there as my avatar after the "oh so noobiness" accident I just did. Think it's appropriate for the time being.

Quote:
Originally Posted by Ceadderman View Post
Well you could remount the board using glass washers to get it away from the MoBo tray. I would make sure that all my standoffs were hand tight with a reasonable tuck from a Phillips or Socket driver and then follow the process to the end. If it doesn't clean it up, then maybe you have one or more connectors in the wrong place.

~Ceadder
Ok... I checked the placement of standoffs and I should be good. Never had issues with the screws that fasten the mobo to the case so I should be good. As for washers, I did think of this but I would still be in "metallic contact" with the case via the threads I believe. Interesting couple of other posts bringing up the lessened conductivity of brass. I have read of plastic standoff but in relation to older mobos and cases. Personally never seen then.

Quote:
Originally Posted by SgtHawker View Post
Do you have an ohmmeter? Generally very high resistance should be good and a short, well... not so good.

Ground points to case should be a short, but you can test from each pin on power connections (realizing which are grounds obviously) and test away.

Signals to case can be a bit harder as you can read thru components to ground and it is uncertain exactly what to expect without schematics from the board manufacturer.

I recently had trouble after (re)installing a UV CCFL lighting set, that my computer would hard lock, and my GTX280 green OK LED would go red when I turned on the light. Eventually I found the wire had a small strip in the covering that allowed a short to ground of the 12vdc supply which caused the trouble, if it was close enough to the optical drive the assembly was set on, to actually short. Moving the case around might keep the wire far enough away not to short.
Yes I have an ohm meter... I should! Was an electrician in the Navy and my son is finishing electrical engineering school so shame on me if I didn't.

You kinda took me in a direction I wanted to go in and for which I was not specific in my original post. Let me take advantage of the fact that my case is empty and start checking for shorts/grounds. I guess that the only low resistance reading should be black PSU wires (ground) to the case then, right? All other colored wires should show infinity or damn high resistance readings.

I think that once my new mobo arrives, I'll install it and before hooking anything up I'll go around checking as well. Maybe I can also simulate a short/ground (without powering up the rig) and take ohm meter readings along with pix for other member's benefit.

Stripes... one of my all time favorite movies. Like the spatula scene!!!
Edited by Kahbrohn - 8/10/11 at 4:10am
post #10776 of 13131
Hope some one else has already ran into this or knows the answer as I am pulling my hair out trying to get this correct.

The issue I am having is that I have a Crucial C300 128Gig SATA III SSD, I have read the SSD threads and the install guide on it several times over and have followed each point, I now have my SSD installed but I am seeing in HD Tune that my speeds are very low {around 275Meg instead of 375+} and under the INFO tab it is showing me that it is running as a SATA II device.

I have upgraded the firmware on the SSD from 006 to 007.
I updated my Moterboard BIOS from 1203 to 1304.
I Installed WIN 7 Ultimate in IDE mode than changed the Registry from IDE to AHCI.
I set my BIOS to AHCI and when WIN 7 booted it installed the correct drivers.


I have only the SSD and a DVD installed in the SATA slots 1 & 2
I have set the BIOS SATA ports to SATA III after not seeing any difference when set to Auto.


I have attached a screen shot showing the Info tab for HD Tune... I am hoping that someone knows the trick to get this running on at the speed that I paid for...




Thank in advance for any and all help...
    
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post #10777 of 13131
Quote:
all 9 motherboard mounting holes must have good contact with the motherboard tray and/or case
Tweeky, that was HUGE! I thought just the opposite, until I actually started to think - and do some reading. There are many gradients of conductivity amongst the metals, silver (Ag) and copper (Cu) being at the very top. The fact that brass is 28% less conductive or only 28% as conductive (I forget which it is) still says that, like all metals, it does conduct electricity well.

The non-corrosion part never occurred to me.

Damn, you guys on OCN be knowing things!

Hey Kahbrohn, with you burning up motherboards as quickly as they are delivered, I could send you my Gigabyte UD3. By now I think it's impervious to "static cling".

My UD3 board also is quite smart. It knows its way back and forth to RMA very well!
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post #10778 of 13131
wow all these shorting out problems? I know a friend of mine has a bit of a prob as well but it seems to be with the Cooler Master 932 and 942 not the board as he has a different board and they are talking about this same prob on the CM thread
post #10779 of 13131
Quote:
Originally Posted by Bradford1040 View Post
wow all these shorting out problems? I know a friend of mine has a bit of a prob as well but it seems to be with the Cooler Master 932 and 942 not the board as he has a different board and they are talking about this same prob on the CM thread
I don't think they are multiple problems. I think it's just people trying to help me out with a concern that I have.

I just fried my CH4F mobo due to static electricity. Am waiting for my C5F (in transit) to get in. In the meantime, I am just running through different things that could have gone wrong in my particular case and am taking advantage that mu rig is disassembled to check things out. In other words... I am covering my bases. Mrs. Kah is an unhappy camper right now and she wields a vicious whirlwind frying pan!

But... what you mention regarding the case makes sense and what I am after does kinda go in that direction. Didn't think about checking the case thread. Thanks though!
post #10780 of 13131
Quote:
Originally Posted by incurablegeek View Post
Tweeky, that was HUGE! I thought just the opposite, until I actually started to think - and do some reading. There are many gradients of conductivity amongst the metals, silver (Ag) and copper (Cu) being at the very top. The fact that brass is 28% less conductive or only 28% as conductive (I forget which it is) still says that, like all metals, it does conduct electricity well.

The non-corrosion part never occurred to me.

Damn, you guys on OCN be knowing things!

Hey Kahbrohn, with you burning up motherboards as quickly as they are delivered, I could send you my Gigabyte UD3. By now I think it's impervious to "static cling".

My UD3 board also is quite smart. It knows its way back and forth to RMA very well!

(SIGH)

At least you called me Kahbrohn instead of Kah-boom!

But seriously though... That thread I posted a few posts back has a tip to "not overtighten" the mobo screws. I like to tighten them so who knows if I did overtighten or not. Now that I watercool I really do not have a need to. Before I used to use big and heavy air coolers so I would tighten with the intent to mitigate the air coolers weight against the mobo.

I guess this is where I will say that "I need to loosen up a bit" on that. (I was gonna say "I need to loosen up a bit on my screws" but then SOMEONE will come, quote me and place that as their signature quote).

This evening I plan on a fun-filled ohm meter reading session between all of the plugs on the PSU with the case itself. Molex connectors and the power connectors for the CPU and GPU's is easy enough. It's those small pesky SATA connectors that have me stumped. Ideas?
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