# Thread: YAOP (yet another Opus problem)

1. Originally Posted by SAScooby
heres my take on your problem

the tester draws current (adds resistance)- the opus provides current so it works

your current pc and mobo dont draw enough current to get the opus into its operating range, and hence its pushing out wussy current. The opus is probably designed to only push out as much as is required, the mobo doesnt draw as much as is needed to kick the opus into doing something. there is a formula to explain what I am talking about - current draw but havent a clue how to explain it in other words

you need to think a little out of the box here, i would try your pc with the proper clock speed and all and add as many peripherals as you can.
Surely, with the meter being connect in series to measure the amps it would reduce the current anyway? It would have to be in parallel to increase the current. If anyhing, from the test results, the system is drawing too much and the insertion of the tester is limiting it.

2. Originally Posted by mindracing
Surely, with the meter being connect in series to measure the amps it would reduce the current anyway? It would have to be in parallel to increase the current. If anyhing, from the test results, the system is drawing too much and the insertion of the tester is limiting it.
the system is absolutely under the opus specs, I posted the drains before
my multimeter is a good one, fluke is the way :P
by the way I'm gonna spend the evening in my car, I'll post later

3. Originally Posted by mindracing
Check the impedance of your tester. If it's a cheap one the impedance may be low and what it is doing is causing the voltage to drop and limiting the current on the 3.3 rail.
The impedance of an ideal current meter is ZERO. Lower is better! Still, the point is well taken. The meter in series with your 3.3V rail will induce a voltage drop linearly related to the current draw. Less expensive meters generally have a higher impedance and thus will drop more voltage. It's possible your meter is helping to get your 3.3V rail within the range your motherboard desires.

The Opus 150W is rated at 2% on the 3.3V rail. Under load, you should see 3.234-3.366V. The ATX 2.01 specification allows 5% on the 3.3V rail (3.135-3.465V). The voltage you measured on your 3.3V rail appears outside of the Opus specifcations but still within ATX specifications. Get a a replacement Opus or motherboard or both.

Using a resistor to patch your problem will be problematic because it won't give you fixed regulation. If your system varies the current draw on the 3.3V rail too much, you may still end up going in and out of the specified range.

4. Originally Posted by rando
The impedance of an ideal current meter is ZERO. Lower is better!
YEP! You're right there.

REM: Must type AFTER thinking.

5. Originally Posted by SAScooby
you need to think a little out of the box here, i would try your pc with the proper clock speed and all and add as many peripherals as you can.
well, you're the man!
I forced my board to boot at 1ghz clock speed, instead of 600mhz
mobile athlons default multiplier is 6x so instead of using 100mhz I set the board to use 266mhz fsb
at this configuration the system boots up properly
after that I tried to add another hdd, and it worked
then another dvd and it also worked
I really think we've solved this issue guys, and I'm very happy
I'll do some more tests just to be sure, something like rolling back to 600mhz and see if it stops booting again
don't know if it's the opus or the mainboard which gave the problem, and I don't even care right now

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