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  #1 (permalink)  
Old 24th April, 2003, 06:39 PM
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8rda VBT voltage keeps spiking/jumping around why??

I set it at 3.15/1.575v and its fine up till test 5 on mem test then it drops to like 3.15/1.570 and causes error upping the vbt back to 1.575v through the VR helps stabile then it goes back up to 1.582v because i had to up the vbt how can i fix this or is this commom?

so should i keep it at 3.15v/1.582v 24/7 so when the vbt drops it will stay above 1.575 and keep it working stable or is there another reason for this??
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Old 24th April, 2003, 10:41 PM
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Try upping the VBT just a *little* bit. Try to have the load vbt match the load vdimm, instead of matching idles. Just an idea.
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Old 25th April, 2003, 01:50 AM
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see thats the problem ddr voltage is dead 3.15v and never moves at all under load, lol...
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Old 25th April, 2003, 03:47 AM
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Quote:
Originally posted by qwerty57
see thats the problem ddr voltage is dead 3.15v and never moves at all under load, lol...
What power supply? How do your 5v and 12v voltages look?
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Old 25th April, 2003, 03:59 AM
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12v is low 11.55-11.67v and 5v is at 4.91v I took off the mods Ill redo them both with 150ohm VR's instead of the 1k's and im changing out this truepower 550 with a true control 550w
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Old 26th April, 2003, 09:04 AM
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If you always run Vddr at 3.15V, try using a 1% (metal film) fixed-value resistor instead of VR to do Vddr/VBT mod. VR has +/- 20% tolerance.

Tip: You can use many 1% fixed-value resistors if you want to
have many choices of Vddr/Vbt too. Just solder the resistors to a jumper switch.
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