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OC'ing an ASUS M4A88TD-V EVO cpu voltage problems - Page 2

post #11 of 25
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Quote:
Originally Posted by un-nefer;12415952 
As for the CPU throttling causing the "mosfets" to overheat, I'm not sure how you came to that conclusion headscratch.gif

so what causes cpu throttling?

my understanding of it is that power demands of the cpu becomes too high, regulators/mosfets/chokes try to deliver this power and overheats. to compensate for the heat, power is regulated down, thus causing less power to get to the cpu causing it to drop its multiplier while it shouldnt because c&q is disabled.

my $60 asus m4a785m "budget board" never had voltage spikes like this mobo with the same settings. i had a 24/7 oc @ 3.8ghz with 1.41v, 2600mhz nb @ 1.3v for almost a year. voltage never climbed above set vcore with llc enabled.

my previous reply to you was not intended to be confrontational and you shouldnt interpret it as so. im frustrated with this mobo, as compared to my $60 mobo, llc variances on both boards differ so much in a way that the $60 mobo is superior.

if llc is doing what its supposed to be doing on this mobo, the vcore variances are way to high and unpredictable.
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post #12 of 25
But if you enable cpu throttling, then as load drops, cpu speed drops and vcore drops - so no the power demand is lower, not higher.

Your mosfets will start to overheat if the load current gets high, not when it drops away - or if your mosfets do not have efficient cooling for the current passing through them.

It is definitely possible that a motherboards mosfets can overheat and fail, this has happened to numerous ppl - but that is not from throttling cpu, it is almost always from overclocking CPUs and calling for more power then the motherboard can safely deliver (or that the parts used are cheap and just fail).

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post #13 of 25
Thread Starter 
Quote:
Originally Posted by un-nefer View Post
But if you enable cpu throttling, then as load drops, cpu speed drops and vcore drops - so no the power demand is lower, not higher.

Your mosfets will start to overheat if the load current gets high, not when it drops away - or if your mosfets do not have efficient cooling for the current passing through them.

It is definitely possible that a motherboards mosfets can overheat and fail, this has happened to numerous ppl - but that is not from throttling cpu, it is almost always from overclocking CPUs and calling for more power then the motherboard can safely deliver (or that the parts used are cheap and just fail).

what i said was, cpu throttling is caused by mosfets overheating. mosfets overheat and become unstable in the delivery of power to the cpu, thus causing the cpu to receive less power. less power to the cpu=lowering of multiplier because of insufficient power=cpu throttling.

mosfet overheats... needs to cool momentarily to avoid failure... how does it cool itself? deliver less power to the cpu momentarily. less power to the cpu at that moment the fets cools itself=momentary drop in cpu multiplier from insufficient power.
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post #14 of 25
This has absolutely nothing to do with VRM's overheating.It is LLC.You should be able to change the LLC by % no? If you can(my Asus board had 0-100% with 7 0r 8 steps)try setting LLC% to around 30%.This will allow some voltage correction while keeping it from going to high.
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post #15 of 25
Thread Starter 
Quote:
Originally Posted by Redwoodz View Post
This has absolutely nothing to do with VRM's overheating.It is LLC.You should be able to change the LLC by % no? If you can(my Asus board had 0-100% with 7 0r 8 steps)try setting LLC% to around 30%.This will allow some voltage correction while keeping it from going to high.
thanks for the advice, but my mobo's LLC options are 'enabled' or 'disabled'..... maybe this board is just not a good x6 oc'er.... im just disappointed that my $60 asus m4a785-m was a waaaaaaaaaay better clocker.
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post #16 of 25
I think that'll do it Redwoodz.... I don't even know about LLC, first of all vDroop is not a problem on my mobo and second I don't even have an LLC option in the BIOS
post #17 of 25
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Quote:
Originally Posted by xd_1771 View Post
I think that'll do it Redwoodz.... I don't even know about LLC, first of all vDroop is not a problem on my mobo and second I don't even have an LLC option in the BIOS
good for you and your mobo. i guess that's what makes you a guru.
5,000 posts...... 500+ reps...... and no knowledge of LLC?
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post #18 of 25
I've overclocked three different multi-core AMD CPUs over the last 5-6 years, and the same thing happened with all of them.

The symptom I've seen is as follows:
You set your Vcore in bios to some number.
You boot the machine with an O/C.
The monitoring software you use reports an abnormally high voltage.
And subsequently, the CPU, due to overvolting, is much hotter than "normal".

My experience has shown on every front, overclocking a CPU too far, causes it to not properly set the voltage to the motherboard. This has happened on my old Athlon X2 3800+ (Gigabyte nForce3 MB), Athlon X2 4200+ (Asus MB), and my current Phenom X4 9950 (Asus M3N-HT Deluxe).

Typically, the machine seems stable, but in reality it is not.
There are other symptoms that happen as well. Watch for these issues:

When overclocked too far, your hardware monitoring software may be disruptively slow on launch, for example, I use SpeedFan which controls 3 of my 6 fans, and it causes my mouse to "hang" for a few seconds when the overclock is beyond what the CPU can properly handle. Downclock, and SpeedFan produces no problems at all.

Sometimes, when overclocked too far, the fan speeds will "spike" or "drop-spike". In other words, fan speeds my zoom to 100% for a a second or two, then return to normal, or alarmingly, the fan(s) may sudden drop to zero for a split second.

I state with some alacrity, this is not a motherboard issue.

My conclusion is born of simple overclocking vs complicated overclocking.
Simple overclocking is just changing the multiplier.
In the list below, the first 3 overclocks are multiplier changes only.

(SpeedFan reporting voltage, and CPU-Z reporting effective bus x multiplier)
My Phenom 9950 bios voltages @ different clock speeds:
1.2800v@2.600 GHz - 200.9x13, stable, stock speed, reports 1.28v. CPU is very cool idling at 30 to 32C.
1.3125v@3.014 GHz - 200.9x15, stable, smooth o/c, reports 1.31v CPU is cool at 34C.
1.3250v@3.114 GHz - 200.9x15.5, crashes eventually, reports 1.42v. CPU is hot idling at 42C.
1.3125v@3.055 GHz - 210.7x14.5, stable (seemingly), but reports 1.41v, SpeedFan wonks my mouse response for a bit upon launch. CPU is hot idling at 44C.
1.3125v@3.045 GHz - 210.0x14.5, stable, reports 1.31v. CPU is warm idling at 37 to 38C.

I've never had the 3.055 overclock crash, but that over-volting, and subsequent hot CPU temps scare me, so I'm relegated to the 3.045 overclock.

Clearly, when the CPU is oc'd too far, it can't properly set the voltage register/whatever. And this has happened on each CPU, regardless of motherboard.

With the current o/c, even after 2 years, my machine feels snappy, and useful. I'll be getting a Phenom II soon. And when I overclock it, I'll watch that voltage closely as well.
Edited by ZeeRoD6 - 3/5/11 at 10:02am
post #19 of 25
Ok I have this Same bord and I was trying to find a Fix for the V Dip. I guess im takeing this Bord back to frys because it fails at life thats to bad i really like Asus. Dose anyone know of a bord around $110-130 that holds Voltage you set it to?

Ive been trying to get a stable OC with my 1090T at 4.0Ghz, CPU gets up to 45C in Prime95 I have Voltage set to 1.53 I know thats High but ive used1.45 1.48 1.49 1.5 CPUID shows 1.5 while i have it set to 1.53 and then when I run Prime95 I crash do to V Dip at 1.46 1.43 ***....
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post #20 of 25
Quote:
Originally Posted by Zackmustdie View Post
Ok I have this Same bord and I was trying to find a Fix for the V Dip. I guess im takeing this Bord back to frys because it fails at life thats to bad i really like Asus. Dose anyone know of a bord around $110-130 that holds Voltage you set it to?

Ive been trying to get a stable OC with my 1090T at 4.0Ghz, CPU gets up to 45C in Prime95 I have Voltage set to 1.53 I know thats High but ive used1.45 1.48 1.49 1.5 CPUID shows 1.5 while i have it set to 1.53 and then when I run Prime95 I crash do to V Dip at 1.46 1.43 ***....
I have the same board. Enable LLC for the CPU ONLY in the bios. Leave it disabled for CPU-NB. Set your vcore to 1.4v. This gives me a stable 4.0GHz OC in OCCT stress test.
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