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EPoX MotherBoards EPoX Intel and AMD Motherboards.


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  #1 (permalink)  
Old 28th May, 2003, 09:13 PM
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8RGA+ and 12V ATX connector

I am sucessfully running 8RGA+ at 213 FSb but I am wondering about low 12V rail - it is at 11.70V at full load while 5V rail is 5.05V.
So I am interested what would happen if I unplug 12V ATX connector and run the board only with standard ATX connector.
I am scared to do that - just to see will my 12V rail improve.
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EPOX 8RGA+ rev. 1.0 ,BIOS 3505, NB A3 WATERCOOLED
AMD Barton 2500+@2260Mhz(10.5*215)@1.80V WATERCOOLED
TWINMOS PC3200 2x256MB w/Twinmos chips@ 2-3-3-6@2.77V in sync with FSB running in DUAL CHANNEL MODE
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HDD Seagate 60GB,HDD WD 40 GB
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  #2 (permalink)  
Old 28th May, 2003, 09:23 PM
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Given that the 12V rail is supplying the processor's power requirements, it might not be a great idea to disconnect the 12V ATX power connector! That's why your 12V rail might be a bit lower than you expect it to be.

Áedán
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  #3 (permalink)  
Old 28th May, 2003, 09:32 PM
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I thought that Athlons are feeding from 5V, not 12V rail.
So why on 8RDA+ I had 12V at 12.36 and 5V at 4.91?
Quite opposite behaviour of two similar boards....
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EPOX 8RGA+ rev. 1.0 ,BIOS 3505, NB A3 WATERCOOLED
AMD Barton 2500+@2260Mhz(10.5*215)@1.80V WATERCOOLED
TWINMOS PC3200 2x256MB w/Twinmos chips@ 2-3-3-6@2.77V in sync with FSB running in DUAL CHANNEL MODE
Powercolor Radeon9500 softmoded R9800 Watercooled
HDD Seagate 60GB,HDD WD 40 GB
PSU CHANNEL WELL 420W
WIN XP PRO,WIN2K dualboot
http://service.futuremark.com/compare?2k1=7020074
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  #4 (permalink)  
Old 28th May, 2003, 10:20 PM
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8rda+ used 5v for CPU vcore
8RGA+ uses 12v for CPU Vcore.

If you unplugg the 12v ATX connector you may damage your PSU and mainboard.
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  #5 (permalink)  
Old 28th May, 2003, 10:29 PM
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Thanks for info, Holst, the manual says nothing about damaging PSU and mainboard if ATX 12V is unplugged.
BTW, are the molex connectors good spots to measure voltage rails with multimeter?
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EPOX 8RGA+ rev. 1.0 ,BIOS 3505, NB A3 WATERCOOLED
AMD Barton 2500+@2260Mhz(10.5*215)@1.80V WATERCOOLED
TWINMOS PC3200 2x256MB w/Twinmos chips@ 2-3-3-6@2.77V in sync with FSB running in DUAL CHANNEL MODE
Powercolor Radeon9500 softmoded R9800 Watercooled
HDD Seagate 60GB,HDD WD 40 GB
PSU CHANNEL WELL 420W
WIN XP PRO,WIN2K dualboot
http://service.futuremark.com/compare?2k1=7020074
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  #6 (permalink)  
Old 28th May, 2003, 10:30 PM
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Quote:
Originally posted by Epox Maniac
Quite opposite behaviour of two similar boards....
Indeed, as they've got different power regulation circuitry on them! They might be similar, but they're definately not the same.

Now you know why your 5V is higher than you expect, and your 12V is lower than you expect.

Áedán
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  #7 (permalink)  
Old 29th May, 2003, 12:12 AM
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If you want to double check voltages then a molex connector is the best place to do it.
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Old 29th May, 2003, 09:18 AM
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That is a great info, Holst.
I doublechecked with multimeter and I got 11.90-11.96V full load while in BIOS it says 11.68V.
Thanks for my peace of mind.
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EPOX 8RGA+ rev. 1.0 ,BIOS 3505, NB A3 WATERCOOLED
AMD Barton 2500+@2260Mhz(10.5*215)@1.80V WATERCOOLED
TWINMOS PC3200 2x256MB w/Twinmos chips@ 2-3-3-6@2.77V in sync with FSB running in DUAL CHANNEL MODE
Powercolor Radeon9500 softmoded R9800 Watercooled
HDD Seagate 60GB,HDD WD 40 GB
PSU CHANNEL WELL 420W
WIN XP PRO,WIN2K dualboot
http://service.futuremark.com/compare?2k1=7020074
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  #9 (permalink)  
Old 30th May, 2003, 04:39 AM
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Quote:
Originally posted by Holst
8rda+ used 5v for CPU vcore
8RGA+ uses 12v for CPU Vcore.

If you unplugg the 12v ATX connector you may damage your PSU and mainboard.
umm.. i'll damage the mobo? well i'm running my 8RGA+ without using the 12v connector... coz my psu is old, dun hav the 12v connector
anyway everything looks fine.. no problem at all
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Old 30th May, 2003, 05:54 AM
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um. I'm a concerned about this to. My mate is buying my 8RGA+ off me & putting his 400W Enermax PSU on it which doesn't have the 12v connector. Will this kill the board?
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  #11 (permalink)  
Old 30th May, 2003, 11:42 AM
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well my board been running for more than 2 months like that so... y would it kill the board anyway? just dun come after me if ur board goes dead :P
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  #12 (permalink)  
Old 30th May, 2003, 12:59 PM
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The problem with running withoug hthe 12v connector is that the entire board and CPU will be running from one wire in the ATX connector..

Putting a big amperage through the one wire may casue a voltage drop and may affect stability.
Ina worst case the ATX connector plugs may burn out damaging the board.

It is important to use the 12V connector, if you dont have one and want to keep a high quality old PSU then you could make an adaptor from a molex to the 12v plug..
But if you only have a cheap PSU id recomend buying another in the long run.
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  #13 (permalink)  
Old 2nd June, 2003, 10:44 AM
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thanks for the advice, i'm buyin a new one as soon as i can get a good deal
well actually the current setup is a temporary solution coz i rma'ed my psu
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