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This basic tower setup good for under $400? - Page 6

post #51 of 54
mdocod,i am not saying 3+1 boards are bad,i have one myself (it is coming out today tho for a 790xta) im saying that its stretching the boards rather than being within capabilities to run high tdp. it was fine in the tests but heatsinks were added to the board prior to the tests,plus it was a controlled environment and short term.
do you think 1 yr down the line,the biostar will still be going strong? im thinking not....

Is the OP hooking fans to this board? Stressing PWM circuit even more? Poor case design with no airflow? There are a lot of variables which benchtesting does not include,wouldnt it be better to allow some leeway in the board?

"One of the MOSFETs reached a horrifying 86C. Though the maximum junction temperature of the MOSFETs is listed as 175C, the performance degrades long before that and the temperature measured during the experiment was only the temperature of the MOSFET heatsink, which is sure to be lower than the actual junction temperature (source). Though these high temperatures are cause for some alarm, it is only in regards to stability. I sincerely doubt that these temperatures could cause a MOSFET to explode or catch fire."

your test results seem promising, and nearly 90c is very,very at the edge... but still acceptable. I should warn you again,tho, that this lonely electrolytic cap will die first, because it cant stand the temperature overtime. especially hot summers, and overheated rooms, are the 2 things, that are as dangerous to the FET, as cancer is for a Human
Thanks for mentioning me,also
Actually I'm willing to bet that the MOSFET which I measured at 86C did get even hotter, perhaps >90C. In Figure 7 there are large sudden fluctuations in the MOSFET temperature. This is certainly an eye opener for me and the reason why I'll be conducting the experiment again but with a dedicated fan blowing on the MOSFETs. I'll also be placing some old VGA ramsinks on the chokes.

"I don't think the temperature will kill the the electrolytic cap even though I admittedly didn't measure it (but I will after I make the cooling improvements). I would wager a guess that as the FETs heat up and eventually malfunction a sudden surge in current or voltage could cause the cap to blow"

dedicated fans...added sinks,is this what the OP wants? seems a lot a trouble for something that should run 125w stock
this is why i would not recommend this board....
Edited by B NEGATIVE - 3/7/11 at 11:19pm
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post #52 of 54
Quote:
Originally Posted by xd_1771 View Post
Actually larger MOSFETs are worse, smaller MOSFETs (new Low RDS (on) designs) are the best because they also run cooler.
Low on-state resistance can be achieved in MOSFETs of all sizes.

Smaller can be better in some applications because they can be switched at higher frequencies with less losses to capacitance. In effect, by choosing a low RDS MOSFET, they can size down and achieve the same power as previous designs (or designs that utilize more "normal" mosfets), while simultaneously opening up the doors to higher switching frequency (optionally) which results in cleaner power and potentially lower capacitor/inductor size requirements.

I agree that relatively small size low resistance MOSFETS arranged into many phases can be implemented to make a great CPU power supply. Larger size mosfets arranged into less phases operated at lower frequencies could achieve the same result with proper filtering. It's all a matter of design approach.

I understand that the current market points towards higher phase count for better power management at the CPU level. This is a circumstantial condition that needs to be addressed as as such.
     
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post #53 of 54
Poor OP! Thread has now been completely hijacked!

...sorry.
Still,biostar are still miles ahead of MSI in power management....
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post #54 of 54
Quote:
Originally Posted by B NEGATIVE View Post
Poor OP! Thread has now been completely hijacked!
+1

I apologies for the intrusion on this thread. It was my fault. I brought the guns to the show to get the ball rolling and couldn't stop.

Regards,
Eric
     
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