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Safe voltages for amd phenom ii x4 945

Last response: in Overclocking
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March 16, 2010 2:12:12 AM

Hello, I also have the 945 deneb 3.0 and currently have it over clocked to 3.3 with stock heatsink.I got to 3.37 and I got a restart but no blue screen as soon as I got into a game of Bad company 2, voltage issue, it was at 1.62 or in that neighborhood, did I need more voltage or better cooling? Going to apply some arctic silver cpu paste, would it help me get to 3.4 or will I need after market cooler as well. Any recommendations on brand for after market heatsink and fan? Thanks!
Antec 750W True Power - AMD Phenom II x4 3.0 Deneb - G.Skill DDR3@1170 - Asus M4A79XTD EVO - PNY GTS-250 1GB
a c 133 à CPUs
a b K Overclocking
March 16, 2010 2:34:58 AM

Sounds like you are overheating

Also you volts 1.65 way to high for just a 300mhz overclock AMD says max should be 1.5 and you should be well under that you might be getting blue screens from too much voltage i would try knocking it back to around 1.4. Also you need to get an aftermarket cooler no doubt about that.
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a b K Overclocking
March 16, 2010 2:57:49 AM

ya at 1.6 you should be hitting closer to 4.1 or 4.2 bring down that voltage and buy a good heatsink depending on ram and case you will have to decide which one will fit look at something like the 212+ or the core contact freezer or similar heatsinks just know if you have a thin case they will not fit do to the fact that they are 150mm tall if you have a thin case go with something like a thermaltake max orb they work really well and have a lower profile
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March 16, 2010 9:18:49 PM

I was not reading the voltage correctly....currently the voltage is at 1.3 with the CPU at 3.3. Havent had a problem so far.
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a b K Overclocking
March 16, 2010 10:03:47 PM

If you are having problems with stablity you are going to want to raise volotage up alittle
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March 17, 2010 4:59:38 AM

The multipliers are locked since it's not the black edition so i have to up the cpu bus frequency to over clock...it over clocks the memory automatically, does it increase the voltage as well if it is on auto. I set the voltage in my bios at 1.425 and I get into cpuz and it says 1.1??? But like I said it's stable at 3.3 and 1.3V . I hope with an after market cooler I can get it higher. But can someone explain the voltage thing?
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March 18, 2010 11:20:53 PM

Do you have any idea why I can't get my voltage over 1.3V for my CPU. If I put it over that in my BIOS is ends up lower than 1.3 as it is on auto. In AMD overdrive the voltage is maxed out @ 1.3 for the CPU....is that locked because it isnt the black edition? I have the amd 945 3.0 deneb 95W
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a b K Overclocking
March 19, 2010 12:11:54 PM

voltages are not locked on non black editions it usually depends on the board you have if you can adjust voltages. so if you dont have voltages set as auto it should be able to increase them in bios
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March 21, 2010 11:08:13 PM

i am currently ocing the same cpu. i have an asus board with the newest bios, 2x2 ripjaws ram a zalman 9900 cooler. i am running 3.6 with overvoltage set to 1.46. my temps dont reach 40. with the stock heatsink i was able to reach 3.4 but it got hot 59 or so. get an aftermarket cooler will help tons! my fsb is 240, htt/nb is 2160, downclocked ram to 1280 timings at 9-9-9-24 (this could be different if you run a different type of memory) and mem voltage at 1.5. it is stable with prime95. hope that helps! oh cpuz says my rig is at 1.41, everest says 1.44
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March 22, 2010 3:03:16 AM

Im running G.skill 1333 ddr3 downclocked to 1178 with the timings at 8 with the CPU at 3.3 and the voltage at 1.3. My fsb is 220, nb speed is 2200. Why is my nb higher than yours when your at 3.6 and im at 3.3? However, when I increase my voltage to anything above 1.3 in my bios, it clocks the voltage lower. I think it may be a somewhat defective board...everything else works fine...even in AMD overdrive, the maximum I can set is 1.3V, and when I boost the OV meter it just goes back.
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March 26, 2010 2:49:23 AM

I believe I solved the problem. My motherboard sends all different voltage readings to these programs such as hwid and cpuz. However, in my bios after I up my voltage to my CPU, and restart, go back into bios I get the voltage readings I'm suppose too. I just don't understand how they change once I get into desktop.....I have plenty of power and nothing wrong with it. But anyways can't get the cores higher than 51C @3.4 running AMD overdrive stability tests with the CPU voltage at 1.375.
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May 9, 2010 4:24:43 PM

there should be no reason to overclock this cpu. its actualy a quad core cpu with 2 cores shut off. most of the time one of the 4 cores is bad so they shut off 2 of them to (A) cover the fact that 1 core is bad (B) to make up for the Duo core demands, Look up Unleashing for the amd 945 or 950 or 955, these cores u can unlock and make your computer run off all 4 cores or in my case 3 cores, (the 4th core was bad in my cpu) but i got another 3,000 "overclocked" boost to it.

P.s. your welcome
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May 9, 2010 5:11:40 PM

No its a full time quad I have the same cpu and im at 3.705ghz with a 1.376 vcore. your gonna need to look into a better heatsink mine doest reach 50c on max load I got a zalman 9700 but i dont recommend it theres much better out there. But you should be able to get more out of your oc. Try an FSB on 247 and match my vcore and let us know what you get.

Dont use overdrive just use your bios. That might help to because your setting one thing in your bios and another through overdrive. I have the same mobo as you also so get a better heatsink and try what I got. I did have mine at 3.75 but I had to raise the vcore higher and in turn gave me temps I didnt like( I dont like being over 50c) but this chip is a great overclocker just play around with it.
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May 10, 2010 4:21:42 PM

make sure cool and quiet and all other power saving options are shut off as well while finding your max stability, i reached 3.85 stable as of now temps are 50c max with zalman 9900 and coolermaster storm sniper case, fsb is 254, volts 1.506, ht 2270, nb 2270, ram at 7-7-7-20-30-1t, 1.53v, 1350 speed, i had to raise all stability voltages to get my fsb over 250, they dont raise temps that ive noticed, but on my asus board(m4a77td) i wasnt able to go over 3.75.
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August 1, 2010 10:02:40 PM

lynx50187 said:
i am currently ocing the same cpu. i have an asus board with the newest bios, 2x2 ripjaws ram a zalman 9900 cooler. i am running 3.6 with overvoltage set to 1.46. my temps dont reach 40. with the stock heatsink i was able to reach 3.4 but it got hot 59 or so. get an aftermarket cooler will help tons! my fsb is 240, htt/nb is 2160, downclocked ram to 1280 timings at 9-9-9-24 (this could be different if you run a different type of memory) and mem voltage at 1.5. it is stable with prime95. hope that helps! oh cpuz says my rig is at 1.41, everest says 1.44



Thanks for that info, couldn't have helped any better. Set the same numbers as you, Vcore 1.45, and didn't exceed 45C in Battlefield Bad Company 2, and GTA IV. Tested it on Prime 95 for 45 to and hour as well. I am using a Rocketfish Universal cooler my buddy didn't like for his 125W 940, works great for this 95W chip. I am happy to get 3.6Ghz out of this chip, thanks again!!!!
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September 21, 2010 5:32:34 PM

lynx50187 said:
i am currently ocing the same cpu. i have an asus board with the newest bios, 2x2 ripjaws ram a zalman 9900 cooler. i am running 3.6 with overvoltage set to 1.46. my temps dont reach 40. with the stock heatsink i was able to reach 3.4 but it got hot 59 or so. get an aftermarket cooler will help tons! my fsb is 240, htt/nb is 2160, downclocked ram to 1280 timings at 9-9-9-24 (this could be different if you run a different type of memory) and mem voltage at 1.5. it is stable with prime95. hope that helps! oh cpuz says my rig is at 1.41, everest says 1.44



IM currently trying to oc the same cpu on an ASUS M4A785-M. Passes 1 hour AMD Overdrive stress test, but only 45 min Prime95. So, I run Memtest test for 2 hours on the below lowered RAM settings and it pass. Run Prime95 again and fails after 45 min. I am stuck at this point. What am I doing wrong???

- 3.6 ghz
- FSB: 240
- Multiplier: x15
- CPU voltage: 1.45
- CPU NB: 1.25
- HT: x10
- HT Link: 2400 mhz
- RAM: DDR@ pc-6400 800mhz (Downclocked to 333 on bios with 5-5-5-15-24 @ 400mhz)
- RAM voltage: 1.95

(Previous screen shot before lowering RAM settings to 333)


Let me know what you guys think....
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January 12, 2011 3:35:14 AM

piranhamoose said:
IM currently trying to oc the same cpu on an ASUS M4A785-M. Passes 1 hour AMD Overdrive stress test, but only 45 min Prime95. So, I run Memtest test for 2 hours on the below lowered RAM settings and it pass. Run Prime95 again and fails after 45 min. I am stuck at this point. What am I doing wrong???

- 3.6 ghz
- FSB: 240
- Multiplier: x15
- CPU voltage: 1.45
- CPU NB: 1.25
- HT: x10
- HT Link: 2400 mhz
- RAM: DDR@ pc-6400 800mhz (Downclocked to 333 on bios with 5-5-5-15-24 @ 400mhz)
- RAM voltage: 1.95

(Previous screen shot before lowering RAM settings to 333)
]http://img691.imageshack.us/img691/4928/31775649.th.jpg

Let me know what you guys think....



Your HyperTransport Link is too high @ 2400 - Change it from auto to the closest possible to 2000mhz. I currently have this CPU running stable @ 3.7ghz and 1.5 volts. I dont ever exceed 48C on the cores at any stress test or any CPU heavy game. As long as the temps are right bump the voltage up on the CPU as well. I needed 1.475 to get it stable @ 3.6
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April 17, 2012 11:09:01 PM

I am running the same set up/voltages and at 100% usage during a 60min test am getting temps MAX of 41 degrees. even when i was sitting on 3.8ghz (slightly unstable) was getting temps maxing out at 44 degrees. Anyone with heat issues the only thing it can be put down to it that the CPU cooler and fan are not doing there job properly or the airflow in your case is out of wack and fans need to be flipped or moved to get airflow running the right way. Pretty much just a trial and error scenario with airflow. I have 5 case fans + the cpu fan and my average case temp is 45degrees thats including my GPU running at 50 degrees min. Sorry for dribbling but anyone with abnormal temps needs to fix intake and exhaust as its just as important as buying high end coolers for components. Unless you go all out and get water cooling that but you will still need a good airflow in your case.

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