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Phenom II Overclocking Guide - Page 16

post #151 of 253
Thread Starter 
Quote:
Originally Posted by Boxey View Post
I'm currently at x 19.5 and about 210, this is giving me 4.1ghz on a AMD 555BE unlocked to a 4 core, I've got the cpu voltage at 1.56V. at this voltage it seems stable and did a full prime95 test, temp not higher than 48°C full load.

is this voltage a bit high ?
That voltage is a bit high, but unfortuneately there isn't really a concrete barrier that defines what voltage is considered to be safe.

The general consensus is that anything over 1.55v is starting to move from the the safe easy OC's, to the "isn't it fun to OC" area where you might start to damage things. The problem is really that each chip is different, and while that OC and voltage might be fine for YOUR chip, it might not be for others. So I'm sure your chip could run at that speed for quite some time, but you would likely loose some sort of longevity doing so. I just can't say how much.

Its your own call of course, and your temps really are quite good, but I think I would personally bring it down a notch for my 24/7 OC, and only ramp it up to 4.1GHz for benching or similar tasks.

But thats just my

Great OC btw.

Cheers!
post #152 of 253
thanks for the info, i'll bring it down to 1.5ish and see if it stays stable :-)
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AMD 555BE x 4 @ 4.1ghz ASUS M4A89GTD PRO/USB3 SATAIII 890GX Socket AM3 Kingston 4GB (2x2GB) DDR3 1600MHz/PC3-12800 HyperX Western Digital WD6402AAEX 640GB SATAIII 
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post #153 of 253
I'm using Phenom 965 black,slightly OCd to 3.6 via multiplier.I've read OP in order to figure out why system crashes after pushing multiplier above 18.After checking AMD overdrive it is reporting Vcore at 1.375,while CPU-Z and some other benchmarks report it at 1.31(sometimes even 1.29)

Now my question is,since ima buy new PSU(obvious culprit ),would 600W be enough(I'm planing to push it to no higher than 4.0)?

Also atm I'm sitting at 54c under full load(prime95 6~ hours stress test) with stock cooling,would it be smart staying on stock or should i upgrade?
AMD
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Phenom X4 965 Asus M4A77TD PRO Radeon HD 4670 KHX1600C9D3/2G 
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post #154 of 253
Thread Starter 
Quote:
Originally Posted by Broin View Post
I'm using Phenom 965 black,slightly OCd to 3.6 via multiplier.I've read OP in order to figure out why system crashes after pushing multiplier above 18.After checking AMD overdrive it is reporting Vcore at 1.375,while CPU-Z and some other benchmarks report it at 1.31(sometimes even 1.29)

Now my question is,since ima buy new PSU(obvious culprit ),would 600W be enough(I'm planing to push it to no higher than 4.0)?

Also atm I'm sitting at 54c under full load(prime95 6~ hours stress test) with stock cooling,would it be smart staying on stock or should i upgrade?
Software reporting for the voltages are not always exactly correct for one, and the voltage doesn't always stay the same either (at a hardware level) because it will fluctuate within a few percentage of the set value... this is normal, so I wouldn't worry about it.

A 600w PSU is MORE than enough for a OC'd 965 BE and a 4670. I run a 430W PSU with my 720 BE and a 5770 if that makes you feel any better. I would give my PSU Basics guide a quick read through to get a better idea of what exactly you need to look for from a PSU.

And for cooling, your temps are ok for right now, but if you are trying to reach 4GHz, then you'll likely need to use more voltage which really drives up the temps.

I would go for a new cooler instead of a new PSU to be honest, unless the PSU is actually giving you stability problems (meaning, if the voltage fluctuations are too serious... you want you can check that with a multimeter btw). Good coolers cost around $40-50 and are worth it for the lower temps and noise compared to the stock coolers.

Good luck
post #155 of 253
Quote:
Originally Posted by logan View Post
Software reporting for the voltages are not always exactly correct for one, and the voltage doesn't always stay the same either (at a hardware level) because it will fluctuate within a few percentage of the set value... this is normal, so I wouldn't worry about it.

A 600w PSU is MORE than enough for a OC'd 965 BE and a 4670. I run a 430W PSU with my 720 BE and a 5770 if that makes you feel any better. I would give my PSU Basics guide a quick read through to get a better idea of what exactly you need to look for from a PSU.

And for cooling, your temps are ok for right now, but if you are trying to reach 4GHz, then you'll likely need to use more voltage which really drives up the temps.

I would go for a new cooler instead of a new PSU to be honest, unless the PSU is actually giving you stability problems (meaning, if the voltage fluctuations are too serious... you want you can check that with a multimeter btw). Good coolers cost around $40-50 and are worth it for the lower temps and noise compared to the stock coolers.

Good luck
I did read your guide(which helped me a lot),IRC my PSU has barely enough Amps on +12v to sustain OCd Phenom + GPU(although I may be wrong,forgot the values,IRC it was 15-16 ),I'll do some more tests tomorrow since PC became unstable after 8 hours of prime95

My main concern is to replace the PSU,i was thinking bout 600W since I'm planning to get more RAM and better GPU(maybe even crossfire lol) in few months.And I can't find anything else wrong that would prevent me from pushing proc up even for 200Mhz,mobo is not really good for OC but it shouldn't stop me that soon either...
AMD
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CPUMotherboardGraphicsRAM
Phenom X4 965 Asus M4A77TD PRO Radeon HD 4670 KHX1600C9D3/2G 
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WD5000AAKS 500GB Windows 7 
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post #156 of 253
Thread Starter 
Quote:
Originally Posted by Broin View Post
I did read your guide(which helped me a lot),IRC my PSU has barely enough Amps on +12v to sustain OCd Phenom + GPU(although I may be wrong,forgot the values,IRC it was 15-16 ),I'll do some more tests tomorrow since PC became unstable after 8 hours of prime95

My main concern is to replace the PSU,i was thinking bout 600W since I'm planning to get more RAM and better GPU(maybe even crossfire lol) in few months.And I can't find anything else wrong that would prevent me from pushing proc up even for 200Mhz,mobo is not really good for OC but it shouldn't stop me that soon either...
If you are thinking of going crossfire, then 600w is a great idea and is totally worth the upgrade. For example.

As of right now if you have a 125w 965 BE and a 69w 4670, then you're theoretical amperage draw would be 16amps ((125w + 69w)/12volts = aprox 16 )which is pretty low. However simply changing to something like 5770 crossfire the power draw jumps by 15amps. Running the 965 at 4GHz will make the whole system draw much more power (200-250w) and so in that case the argument for a new PSU makes a whole lot more sense.

The power draw for a rig like that would be somewhere in the neighborhood of 41amps for just the CPU and video cards which is just about perfect for a 600w PSU... good choice.

Glad the guide helped out, thats why I made it.

I also just changed the formatting some in an attempt to make the guide easier to read. Sometime this summer I'll try to update it to include more information about the C3 steppings and Thuban.

Anyway, good luck with the OC, and welcome to OCN
post #157 of 253
Boxey, how did you get the temp for unlocked 555?

I tried to get 4 GHz as dual core on my 555 BE but no luck (1.475V was the highest i tried).
I did this by just increasing the multi to x20. Would it make a difference if i tried 250 with x16 ?
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post #158 of 253
I have successfully unlocked the core on my Phenom X2 55BE. Disabled CnQ and C1E. Prime95 has been running for 10hrs on all cores except what I think is the stock 2nd core (worker #2). Which failed after about 8 1/2 hours. My question is should I be concerned about this? I'm still running at the default voltage the cpu came with.
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Phenom X2 555BE Gigabyte MA770T-UD3P Radeon 5750 1GB 
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post #159 of 253
Quote:
Originally Posted by ahmadmz View Post
Boxey, how did you get the temp for unlocked 555?

I tried to get 4 GHz as dual core on my 555 BE but no luck (1.475V was the highest i tried).
I did this by just increasing the multi to x20. Would it make a difference if i tried 250 with x16 ?
Ahmadmz

I does not like the multi much beyond 19, try 18.5 and them push the freq up from 200 to 205 etc etc see where it remains stable. Mine seems to need at least 1.45v. The chip also does not like the freq too high even when at 16 - no idea why, i've just played around with it, always seems more stable at up to 19. I've just tried x19 and 211 - gives me 4 Ghz fine

I have an upgraded cooler in push pull mode and five case fans not got the cpu above 46°c when running prime95.

boxey
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My System
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CPUMotherboardRAMHard Drive
AMD 555BE x 4 @ 4.1ghz ASUS M4A89GTD PRO/USB3 SATAIII 890GX Socket AM3 Kingston 4GB (2x2GB) DDR3 1600MHz/PC3-12800 HyperX Western Digital WD6402AAEX 640GB SATAIII 
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post #160 of 253
I have the 965 Black C2 revision... and I cant get it over 3.8 Ghz ... it seams like most people are on the C3... I hear that the C2 needs a higher voltage bias then the C3 to get over the 3.8 GHz mark... does any one have a C2 OC over 3.8... I really would just like to have full stability at 4.0GHz. I fold 24/7 so the cpu will always be under load.

what do people have for any modified voltages, multiplier, bus speed, and HT speed?

Thanks for any help...
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Phenom II X4 965  GIGABYTE GA-790FXTA-UD5 MSI R9 285 CORSAIR DOMINATOR DDR3 
Hard DriveHard DriveOptical DriveOptical Drive
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Main Frame
(17 items)
 
Slave Frame
(13 items)
 
 
CPUMotherboardGraphicsRAM
Phenom II X4 965  GIGABYTE GA-790FXTA-UD5 MSI R9 285 CORSAIR DOMINATOR DDR3 
Hard DriveHard DriveOptical DriveOptical Drive
Spinpoint F3 Crucial C300 SSD Samsung SH-S243N/BEBS Samsung SH-S243N/BEBS 
CoolingOSMonitorMonitor
Corsair H50 Windows 7-64bit Ultimate Samsung P2450H ASUS VS248H-P 
KeyboardPowerCaseMouse
Microsoft Bluetooth (First gen) BFG EX-1200 Thermaltake Black Armor Logitech G700 
CPUMotherboardGraphicsRAM
Athlon 3700+ Abit Fatilty SLI 9600 GSO (48SP) 4 x 1 Gb DDR OCZ Platnium 
Hard DriveOptical DriveOSMonitor
500 Gig - Samsung F3 Plextor DVD-R/RW Windows XP Pro (32Bit) POS 17" 
KeyboardPowerCaseMouse
$5 special at Target XFX 750Watt CM Scout Storm Logitech 
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Steel Series 
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