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Question about Voltages and mosfet

post #1 of 11
Thread Starter 
I've even been told I shouldn't run an unlocked CPU, said that a cheap 3+1 phase shouldn't be running a 125W CPU, despite that the board is rated for 140W. I've also been told I can't OC on a board like that, despite the initial rating. Anyways, here goes what I want to know, or at least confirm.

I'm running what i think is 4+1 Phase, I have 5 areas with mofsets that trace back by the CPU, another set for the RAM and a 7th set for the PCI. I've checked these, but here's the board (from main site w/accurate pic).

http://www.asrock.com/mb/overview.asp?Model=M3A770DE

What I want to know is if it's safe to run 1.55V on a 4+1 phase that isn't cooled. Everything I've read other sources that say it's generally safe to go up to 1.55 but not beyond, or at least isn't recommended to go beyond.

From what I understand 6+1 is the highest actual phase count, the 8+1 (or 8+2?) is actually just two 4+1 phase sets. Now I know ASRock isn't a "premium" brand, but they are a branch off a large brand and I'm going to assume they at least get the same quality parts* (at least they can, not saying they do but they probably have the same retail outlets for parts).

Anyways, back on topic. I've ran this unlocked for at least 2 years? This was ran at 1.4~1.45v almost the entire time, with an IMC of 1.35 the entire time (stability reasons). I've raised it to 3.8@1.53v (cpu) and 2448@1.4v (imc), already done 4 hours of prime95 and temps are fine. I initially ran Prime at 1.55 but I know that I can get that lower (now the 1.53), I'm not exactly sure how low yet.

Anyways, should I ignore the whole "you can't run your low quality parts like that" and continue? From what I've read about the mosfets is that operational temps can go up to 110C and that I probably won't reach that at 1.55v.

Blah, that's the situation.
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post #2 of 11
Your board is a 4+1 Design; it couldn't be rated for 140w CPU otherwise.

The MOSFET's used on the board are cheap though, and run hot no matter what. Without a heatsink I wouldn't recommend overclocking.

You can get some copper RAM Sinks and put them on the board and be doing a bit better.

Right now, I would highly advise against overclocking.


As for a phase count limit, there is none; nor does the number of phases effect how well a board can deliver power. Biostar uses a 4+2 Phase power design on many of it's boards, and they can overclocking Phenom II x6's with ease. MSI boards featuring the same number of phases, burn up.
The reason is because of the quality of MOSFET's used.

You want overspeced, LowRDS(on) MOSFETs for your board. (Which is what BIOSTAR does.)
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post #3 of 11
These are not low RDS. i'm also pretty sure they're 3+1, that last phase on the right appears to be for the chipset and not CPU looking at how the channels are laid out...
post #4 of 11
Quote:
Originally Posted by xd_1771 View Post
These are not low RDS. i'm also pretty sure they're 3+1, that last phase on the right appears to be for the chipset and not CPU looking at how the channels are laid out...
Chipset phase is located by the DIMM slots.

AMD Spec requires 4+1 for 140w CPU's.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by Tator Tot View Post
Chipset phase is located by the DIMM slots.

AMD Spec requires 4+1 for 140w CPU's.
Also, isn't there no NB chipset anymore? it's all CPU side, with the mosfet set by the RAM powering that end. The PCI mosfet powers everything in that area, at least that's how I see everything. That "extra" set powers the IMC, I'm guessing that's why it's connected to the smaller cap, no?

Going back to the CPU sets, so you would advise getting a cooling solution before pushing those? What about running them at 1.4/1.35 for just unlocking, that's decently safe to assume? Thanks for at least clearing things up.
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post #6 of 11
Quote:
Originally Posted by Tator Tot View Post
As for a phase count limit, there is none; nor does the number of phases effect how well a board can deliver power. Biostar uses a 4+2 Phase power design on many of it's boards, and they can overclocking Phenom II x6's with ease. MSI boards featuring the same number of phases, burn up.
The reason is because of the quality of MOSFET's used.

You want overspeced, LowRDS(on) MOSFETs for your board. (Which is what BIOSTAR does.)
Wow, someone is actually touting Biostar for making decent quality boards. It's about time! Maybe I should push mine farther with my new ram. No probably not...
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post #7 of 11
The Northbridge on an AMD Chipset is a PCIe Hub more or less. It's what controls how many PCIe lanes you have available.

The Southbridge is an I/O hub.

On 1156 & 1155 there is no Northbridge. Fusion also has no northbrdige.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by Tator Tot View Post
The Northbridge on an AMD Chipset is a PCIe Hub more or less. It's what controls how many PCIe lanes you have available.

The Southbridge is an I/O hub.

On 1156 & 1155 there is no Northbridge. Fusion also has no northbrdige.
Oh that's right, but that's powered by the same mosfets that power the PCI cards?

Anyways, I've an old aluminum sync that can be cut up into 4 parts and another one I can cut up for a 5th part (actually just cuttong off segments), just covering the mosfets would suffice? I shouldn't have to worry about the coils, I know they get hot but I'm assuming they aren't as much of a problem as the mosfets as I've seen plenty of boards leave those alone.
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post #9 of 11
No, the PCIe slots get their own power delivery system.

I would personally only go up to 1.4v with heatsinks on the MOSFETs. It's not a well built board so it's not going to hold up to overclocking well.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Tator Tot View Post
No, the PCIe slots get their own power delivery system.

I would personally only go up to 1.4v with heatsinks on the MOSFETs. It's not a well built board so it's not going to hold up to overclocking well.
but I've been running 1.4 since I've had it, I can't do an unlock with anything below. I even had it at 1.45 for a while, before they fixed the cpu code (giving a more stable unlock, a nice unintended benifit). I'm not worried about 1.4, as I've had that on for over a year now and ran P95 all night with that and haven't had a problem yet.
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