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Long time Intel OC'er, got my first AMD chip (x4 955)

post #1 of 10
Thread Starter 
Last night i blindly went and OCd this chip on a Hyper 212+. Took it to 3.8Ghz. VID is 1.40v, i required 1.40935v for a 20 run Max Ram LinX run and a couple of Prime95 Blend with 3Gb of Ram being tested (all i had time for).

Now i read that Mobos been burning up due to Phase spec and MOSFETs need additional cooling.

My full specs:
AMD Phenom 955 3.2Ghz
Asus M4A87TD/USB3
Corsair 1x4Gb DDR3 1333Mhz
SilverStone 400W PSU

This PC was not intended to be for gaming, just for work and virtual machines, and made a mistake in my order, wanted 2x2Gb Ram d'oh.

OC Settings:
Multi: 19
FSB: 200Mhz
CPU NB Freq: 2400Mhz
Ram Freq: 1333Mhz
VDimm: 1.55v
Vcore: 1.40935v
HT Freq: 2400Mhz
NB Voltage: 1.17v
CPU NB Voltage: 1.17v
HT Voltage: 1.20v

Vcore LLC - Disabled
NB LLC - Disabled

Room temp: 21*c
Idle temp: 33*c
Normal Load temp: ~40*c
Linx Load temp: 47*c

Am i doing everything right, do i need to make any changes? And should i be worried about by PC exploding?
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post #2 of 10
Bump CPU NB up to 2800 mhz, Push HT freq back down as close to stock as possible ( around 2000 mhz ) .. I forget the rest lol .
post #3 of 10
Thread Starter 
If i may ask, whats the reasoning behind that?
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post #4 of 10
http://www.overclock.net/amd-motherb...hase-list.html

Looking at the charts I think your motherboard has 4 + 1 phase and no heat sink. So maybe its not that good for overclocking.
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post #5 of 10
MOSFET overheating is indeed being shown to be a problem, but it depends on the motherboard, so you aren't necessarily definitely goin to blow your board.

Lemme see if I can find the VRM list that some users created recently...
Hey look at that it was on the front page, helpful:

http://www.overclock.net/amd-motherb...hase-list.html

Looks like your board can take some punishment without exploding, but that you should keep in mind that it is a possibility. You can buy some mosfet heatsinks for about $15 if you're really worried, else it's a good idea to keep some air blowing over your board.
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post #6 of 10
Quote:
Originally Posted by jasjeet View Post
If i may ask, whats the reasoning behind that?
higher ht link usually causes instability. 1800-2100 is USUALLY the most stable.
i high nb is the biggest performance maker other than a 50% oc.
also the performance will take a hit as youre running 4g single stick of ram in single channel.
and please dont say ph2 955@3.2 , you'll confuse people that dont read threads all the way. you got a 955 at 3.8
if its stable at 12 hours p95, lottsa overhead on that voltage.
Edited by pc-illiterate - 3/13/11 at 6:31pm
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post #7 of 10
If you are overclocking, you will definitely want the additional cooling, as these are not low RDS MOSFETs and thus could potentially get very hot. Without the stock cooler, they barely get any airflow whatsoever. Most MOSFET/VRM failures happen on systems where MOSFET airflow is inadequate.
post #8 of 10
Thread Starter 
Ok, i plan to maybe buy the Enzotech MOS-C1 C1100.
Just wondering, where do i need to placew the heatsinks, could some one just edit this picture to show where i need to put them:
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post #9 of 10
This should be right.
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post #10 of 10
Quote:
Originally Posted by jasjeet View Post
If i may ask, whats the reasoning behind that?
you dont need it. it could also cause instability for your platform. keep it close to 2000ghz or 2200ghz is fine. i find that cpu-nb on the denab will ussually be at 2600ghz to 2800ghz...anything above is quite hard. make sure temps stay at 55c and under on your overclock to ensure the best stability possible. max cpu voltage is 1.5 to 1.55v which ever your comfortable with depending on temps. cpu-nb voltage should be at 1.4 to 1.45 volts depending on your cooling. most ram module on amd setup will do 1.65volts and see what kind of timing you can pull off of the voltage. you can set everythign on auto if you like. i find leaving the nb voltage at 1.20 to 1.25 can stable most overclock a little better. running 4 dimm is make it more stressful on the memory controller. i suggest you which those out to 2xgb to get the best clock speed. by looking at your board phase power...i wouldnt go over 1.5volts for a 24/7 usuage. see whats the max clock you can get with 1.5 voltage with temps being at 55c or under.
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