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2 VRM Question?

post #1 of 3
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I give a friend a Biostar A780L3G, which is a 3+1 phase power. I put some VRM coolers on it and did the following stress tests on the mobo after the installing the VRM coolers. An 970 and a 1090T for 6 hours each at stock and an Athlon II 240 at 3.85ghz with 1.56v for a total of 12 hours stress test. The temps on the VRM never went over 45c.
He is running an Athlon II 255 C2 at 3.7ghz with 1.45v and the VRM temp was about 36c.
OK here is the questions.
1) What would be a good stopping point for the VRM temp?
2) Do you think it will be safe to try for 4.0-4.1ghz with this mobo?
Edited by dixson01974 - 7/29/11 at 12:38am
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SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
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post #2 of 3
The VRMs have other important parameters aside from the number of phases, such as the maximum power per phase, so it may work with a 4GHz CPU. I would begin with something like the X6 @3.6GHz and then if it all goes well @4GHz.
Max safe temp is around the 80-90°C level for long term operation, you have a lot of thermal margin, but I'm not sure this is the only thing you should be looking at when doing VRM stress testing. Maybe someone else can chip in with an idea.
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post #3 of 3
id watch voltage fluctuation, as when you overclock the current pulled increases a lot, it will set the VRm out of spec, and when that happens bad things can happen. You can put a lot of strain into the input capacitors which can thrown them out of tune and then your FETs will proceed to work with "dirtier" current, which will then translate into their output.
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