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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 19

post #181 of 1100
So if 4+1 is so bad, why does my board have it and is doing just fine?
I mean I have a good heatsink and all that, but isn't this issue more based on the quality of the components, not the actual 4+1 design?

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post #182 of 1100
Vote sticky.
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post #183 of 1100
Thread Starter 
Read the article, I've said phase count doesn't mean everything. You're on a DFI board, the quality of DFI boards is absolutely great, so great that I almost don't believe it
post #184 of 1100
There aren't too many boards out there with low quality mosfet's except for MSI.
And a few weeks ago i had some fun blowing up mosfet's that i use in my circuits) by running a few amps trough them while they were rated for 1A. At 3A they got really hot, if you dropped a drip of water on it it evaporated immediatly, and after some time a liquid comes out. But they were still working so i removed my pwm controller and got 7A trough it, and it literally exploded into pieces.

(I'm a guy that lieks to destroy things (not my pc ofcourse ! ) and 270V on a NE555 in water is fun.)

Not that it has anything to do with the mosfet's on motherboards.
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post #185 of 1100
So, is there a list somewhere of solid 4+1 boards, so we can go "it's fine, ****" when someone flips out about one of them?

I've already had to defend my little bro's Gigabyte 890GPA-UD3H a couple of times...
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post #186 of 1100
Quote:
Originally Posted by nicksasa View Post
There aren't too many boards out there with low quality mosfet's except for MSI.
And a few weeks ago i had some fun blowing up mosfet's that i use in my circuits) by running a few amps trough them while they were rated for 1A. At 3A they got really hot, if you dropped a drip of water on it it evaporated immediatly, and after some time a liquid comes out. But they were still working so i removed my pwm controller and got 7A trough it, and it literally exploded into pieces.

(I'm a guy that lieks to destroy things (not my pc ofcourse ! ) and 270V on a NE555 in water is fun.)

Not that it has anything to do with the mosfet's on motherboards.
that sounds super fun
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post #187 of 1100
This thread made me register! I'm not new to OC, but am new to the AM3 socket AMDs. I have just put together an x2 555 and an Asus M4A78LT-M LE. Asus specs the board for 95W CPUs. All 4 cores unlocked on the 555. Haven't tried to OC yet, maybe will not at all.

When I look at the board, I see four chokes near the CPU, which leads me to believe that this is a 3+1 board? And the mosfets look like regular transistors, not low RDS(on) versions. Do I have that right?

http://www.newegg.com/Product/Produc...82E16813131619

If this is a 3+1 board, if I add heatsinks to the mosfets and stay at stock (including the hsf), am I ok at 4 cores, or do I need to lock back up? In other words, does the addition of heatsinks enable you to push that 95W rating, or will something else in the VRM become the weak link? If so, what would that be?
post #188 of 1100
Quote:
Biostar (on newer boards), Gigabyte, DFI and ASUS, and ASRock (on newer, higher end boards) usually have the best VRM quality. Though the VRMs aren't necessarily always low RDS, etc. with them, I've found they usually have much better VRM quality and adequate ratings.
So MSI Military spec components is just a marketing gimmick?
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post #189 of 1100
^ Sort of. If you think about it, the military give manufacturing contracts to the lowest bidder...so they probably are not lying about it.
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post #190 of 1100
Quote:
Basically the more phases you have, the more reliable operation because power is split between more phases; the more phases may be smaller, but nevertheless this is much more reliable. More phases/channels is better. Such bigger phases (i.e. 8+2) can be only found on ATX boards usually.
This is not quite true. More phases is not always better per say. What you also have to consider is the implementation of them.

As you probably know the inputs to the board is as 12v's; what then happens is you have a buck controller(its a dc to dc step down transformer of sorts) which is controlled by a pwm controller to charge and discharge an inductor. This can then be chained together with others each one switching on a slightly different cycle.

The reason brands like Gigabyte use loads of phases in this manner is mainly driven by cost and the difficulties in developing large power transistors. And while this system will give you clean power its useless if it cant provide enough power. In other words you could have over 9000 phases but if the VRM ins't capable of supplier a high enough amount or current or the slew rate is too low it won't really matter.
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