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post #241 of 281
Sorry to jump in the middle if this cool discussion... but can you guys tell me where to get parts to build those ribbon cable pcie adapters? or do they sell them?
@race185 you are a dedicated man.. kudos to those helping him. I actually understood the last part where it would decrease the voltage.. smile.gif

on a side note they had a zalman clc cooler (310) on sale last night for 29.99 after 35.00 rebate on newegg usa. latest email sale.
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post #242 of 281
Quote:
Originally Posted by sunset1 View Post

Sorry to jump in the middle if this cool discussion... but can you guys tell me where to get parts to build those ribbon cable pcie adapters? or do they sell them?
@race185 you are a dedicated man.. kudos to those helping him. I actually understood the last part where it would decrease the voltage.. smile.gif
on a side note they had a zalman clc cooler (310) on sale last night for 29.99 after 35.00 rebate on newegg usa. latest email sale.


Ebay: http://www.ebay.com/itm/PCI-Express-PCI-E-16X-Riser-Card-Flex-Flexible-Ribbon-Extender-Extension-Cable-/280933089391?pt=LH_DefaultDomain_0&hash=item4168eac06f
    
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post #243 of 281
Quote:
Originally Posted by Rayce185 View Post

And if it were SOMEHOW possible to disconnect the wide 3.3V point from the card and run a pot between there?

Um a pot will never help with this they offer resistance which will lower the voltage, pots are used on the chips to alter there original resistance and to make them adjustable. Your memory on this card does not have a controller it's more of a direct feed of voltage, the only you can change this is to input a higher voltage by either the way a mentioned a few posts back or find how that voltage regulator works.
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post #244 of 281
I wonder if I could just buy a few more of those extenders and have the card on the desk. Would be easier for measuring etc biggrin.gif
Quote:
Originally Posted by Rbby258 View Post

Um a pot will never help with this they offer resistance which will lower the voltage, pots are used on the chips to alter there original resistance and to make them adjustable. Your memory on this card does not have a controller it's more of a direct feed of voltage, the only you can change this is to input a higher voltage by either the way a mentioned a few posts back or find how that voltage regulator works.

Resistance lowering voltage? I thought when applying U=R*I it would increase the voltage?
Edited by Rayce185 - 12/30/12 at 9:45am
post #245 of 281
@pizzaman thanks i didnt know what to call it .. Ordered.. rep+ as soon as i get on my computer.

@ rayce185 if i understood the circuit correctly it was being used like a dimmer switch in a simple circuit. E= I x R ( please correct me if i am wrong)
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post #246 of 281
Quote:
Originally Posted by Rayce185 View Post

I wonder if I could just buy a few more of those extenders and have the card on the desk. Would be easier for measuring etc biggrin.gif
Resistance lowering voltage? I thought when applying U=R*I it would increase the voltage?

3.3v x 1-999 ohm would lower the Voltage

And if you have 3.3v going to the pot and ground, the wiper can only give out 0-3.3v

Thinking about it you could have 5v and ground and use the wiper to set between 0 and 5v but you would fry it fast as there probably not good under any amperage
Edited by Rbby258 - 12/30/12 at 12:43pm
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post #247 of 281
Thread Starter 
I have another idea now that I know the input power is from the 3.3v line.

Take a pot (10k or so) and put it at 500 ohms. Put it inline with the 5v line you had before and solder back to that leg you removed.

Turn on the card real quick and check the mem volts. See if they lower. Report back.


Quote:
Originally Posted by Rayce185 View Post

Resistance lowering voltage? I thought when applying U=R*I it would increase the voltage?
That is the general Ohms law equation, and does not describe the circuit in full detail. You need to understand the application of it to use it properly. In your power circuit, current is produced from a fixed voltage source. This current is inversely proportional to the load (resistance) of the memory chips, such that less resistance means more current. By adding the pot in series with the mem chips, you decrease the current in circuit such that the voltage source stays the same. This produces a voltage drop on the resistance you added, which means there is less voltage at the mem ICs.

That was a bit convoluted, but I hope it makes sense wink.gif. Here's a little diagram that shows what happens if you put 100 ohm vr in the circuit:


Edited by just_nuke_em - 12/31/12 at 1:17am
    
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post #248 of 281
Thanks for the information nuke, that cleared things up a bit smile.gif

I'll try that out thumb.gif
post #249 of 281
498 Ohms didn't make a difference... 2.45V still.

Raising the resistance to 1k or 2k didn't make a difference either.
Edited by Rayce185 - 12/31/12 at 2:42am
post #250 of 281
Thread Starter 
Quote:
Originally Posted by Rayce185 View Post

498 Ohms didn't make a difference... 2.45V still.
Raising the resistance to 1k or 2k didn't make a difference either.
Hmm, well I'm out of ideas then redface.gif. Strange little card you got there...
    
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