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post #11 of 19
"CPU's Ampere requirement = Watts / Volts
CPU's Ampere requirement = 202 / 1.464
CPU's Ampere requirement = 137Ampere
And according to the the setup of VRMs, 4 phase x 40 ampere = 160A maximum output current for the CPU.
and we are clearly seeing that CPU wanted 137A current which is less than 160A of VRMs. It is probably clear that Its not VRMs bad here."


Something's amiss here. There's no current like 137A, That's 137Ax12=1644 watts. There's no such thing in today's regular computer scale biggrin.gif

1.464v / 202 watts. That equals to 16 amperage.

PS: By the way, for a week 24/7, i've used my 1090t at 1.47v @ 3900 and if your calculation is valid, mine was similar to 200 watts as well. Wow, the very first AM2+ 790fx board K9A2 Platinum could held a 200watts while it's only rated as 140w. I must have some bad-ass vrms biggrin.gif Thou as soon as I saw a 170w figure on an online PSU calculation page, i backed down the voltage. It's now effectively running on a Zambezi Turbo Core template with the default voltage(auto).
Edited by Catscratch - 12/31/11 at 1:21pm
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post #12 of 19
My 1st 890FXA-GD70 was a fail, got FF after OC-ing my 555BE X2 @ B55 X4 from 3.2GHz to 3.6GHz (nothing burned out, but the FF was blinking and MBO did not startup the fans).

The 2nd 890FXA-GD70 is rock solid (new revision, a bit lighter heatsink collor), runed my B55 X4 @ 4GHz 1.35V with no problems (max stable validation is 4.7GHz):
http://valid.canardpc.com/show_oc.php?id=1764715
(cant find the 4.7 validation - im Don Kihoty form the BUG.HR/FORUM Croatia)

The MBO is now in my sons PC with another B55 X4 @ 4GHz 1.45V, runs like a rock.

Still, MSI is always a gamble, if you have luck, its ok, if not, it dies.
post #13 of 19
Quote:
Originally Posted by Catscratch View Post

"CPU's Ampere requirement = Watts / Volts
CPU's Ampere requirement = 202 / 1.464
CPU's Ampere requirement = 137Ampere
And according to the the setup of VRMs, 4 phase x 40 ampere = 160A maximum output current for the CPU.
and we are clearly seeing that CPU wanted 137A current which is less than 160A of VRMs. It is probably clear that Its not VRMs bad here."

Something's amiss here. There's no current like 137A, That's 137Ax12=1644 watts. There's no such thing in today's regular computer scale biggrin.gif
1.464v / 202 watts. That equals to 16 amperage.
PS: By the way, for a week 24/7, i've used my 1090t at 1.47v @ 3900 and if your calculation is valid, mine was similar to 200 watts as well. Wow, the very first AM2+ 790fx board K9A2 Platinum could held a 200watts while it's only rated as 140w. I must have some bad-ass vrms biggrin.gif Thou as soon as I saw a 170w figure on an online PSU calculation page, i backed down the voltage. It's now effectively running on a Zambezi Turbo Core template with the default voltage(auto).

CPU uses ~1-2v

That is what Voltage Regulator Modules are for.....converting 12v to something the CPU can use without dieing.

putting 12v though your CPU would mean almost certain death

and the highest "rating" you will ever see is 140w, because that is the highest TDP that AMD makes. Many boards support much higher.

Technically the Crosshair V also supports 140w, but it has no problem outputting well over 400.
Edited by reflex99 - 12/31/11 at 3:10pm
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post #14 of 19
Yep, actually, as long as a mobo has options higher than stock voltage, it should also have the means to supply it. So they should actually advertise "200w/300w" maximum rather than limiting to a CPU wattage. That will give an idea about the VRMs.
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post #15 of 19
any motherboard would burn with 4+1 bare VRM's and running a 6-core at 4ghz.
post #16 of 19
Quote:
Originally Posted by naizarak View Post

any motherboard would burn with 4+1 bare VRM's and running a 6-core at 4ghz.

I wouldn't be nearly that general.
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post #17 of 19
Quote:
Originally Posted by reflex99 View Post

I wouldn't be nearly that general.

maybe not as quickly as the msi's but it wouldn't last long.
post #18 of 19
You could use extremely over rated transistors + fans/other active airsource, and easilly run 4GHz on a full X6 die....
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post #19 of 19
Thread Starter 
Quote:
Originally Posted by Catscratch View Post

""

Something's amiss here. There's no current like 137A, That's 137Ax12=1644 watts. There's no such thing in today's regular computer scale biggrin.gif

1.464v / 202 watts. That equals to 16 amperage.

PS: By the way, for a week 24/7, i've used my 1090t at 1.47v @ 3900 and if your calculation is valid, mine was similar to 200 watts as well. Wow, the very first AM2+ 790fx board K9A2 Platinum could held a 200watts while it's only rated as 140w. I must have some bad-ass vrms biggrin.gif Thou as soon as I saw a 170w figure on an online PSU calculation page, i backed down the voltage. It's now effectively running on a Zambezi Turbo Core template with the default voltage(auto).


Hey Catscratch ! You missed here ! You calculations are wrong !
All cpu's requirement is low voltage with high current !
According to AMD's 'Power and Thermal Data Sheet', you can easily see the current requirement of 125w and 140w AMD AM3 CPU (remember they are not talking about OVERCLCOKING)

375

And I tell you why many brands have to list their boards with a support of 140w TDP, If you used AMD then you should be known It uses 1.296volts (~1.3v) at factory clock. GPUz and AMD Overdrive will tell you.

Motherboard's wattage support should be = CPU's Ampere requirement x CPU's voltage
Motherboard's wattage support should be = 110 x 1.296
Motherboard's wattage support should be = 142watts (~140watt)

you can't judge a board by only seeing the TDP support of it whether it will overclock or not !

And as "Reflex99" said thumb.gif any CPU with direct contact of 12v will immediately die thumb.gif
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