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Overclocking X3 720 With Slow Memory

post #1 of 9
Thread Starter 
I have been attempting to overclock my 720 with limited success. No matter what I do I can't break 3.5GHz with 3 cores. In order to even get that far I have to set my vcore to 1.525v which seems very excessive looking at the results other have experienced. It's particularly frustrating because my temperatures have been great! Currently at full load it's 50C and idle 28C. But even with vcore @1.575v, North Bus at 2.2GHz on 1.425v, 3.6GHz fails Prime95 in 10 mins.

So something is wrong. The first thing I suspected was the memory. It's clocked at only 667, with times 5-5-15-21. It's so low I'm worried about changing the bus speed, and I still have no grasp of what good timing is. Second, this is a 760G motherboard. I'm worried that the motherboard might not be distributing the volts properly. Like even though in the BIOS it says 1.525v, when I look at CPU-Z it's 1.504 which is a little concerning being a full step. Third theory as to why it isn't working is that each processor is different and I just got the short straw.

But sorry about the crap components, Micro Center just had a deal on a 720 with a Gigabyte MA78LM-S2H for a $100, 9800 gt for $70 and then I picked up the cheapest DDR2 memory I could find so that I could throw the computer together.

Anyway, now I'm stuck. Is there something I can do, and if components need to be replaced which ones?
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post #2 of 9
Considering the 720 is a Black Edition CPU, you don't even need a good motherboard. Just raise the CPU multiplier and you don't have to touch the FSB or anything else.

The set CPU voltage in the bios always differs from the Cpu-Z readout, that is perfectly normal. Cpu-Z will show you the idle voltage in Windows, and when you load the CPU with some stress testing it will show the load voltage.

Either way, try overclocking with the CPU multi only and then start changing memory settings.
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post #3 of 9
Thread Starter 
Thanks clearing that up. I still have voltage issue. 1.525v for 3.5GHz; >1.575 for 3.6GHz.
So how would I go about changing the memory settings? If you know of a good tutorial I would be happy to read it.
My System
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CPUMotherboardGraphicsRAM
Phenom X3 720 BE Gigabyte MA78LM-S2H PNY 9800 GT 4GB 
OSKeyboardPowerMouse
Windows 7 64bit and Gentoo ABS PC Power & Cooling - 750 Logitech MX518 
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My System
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Phenom X3 720 BE Gigabyte MA78LM-S2H PNY 9800 GT 4GB 
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Windows 7 64bit and Gentoo ABS PC Power & Cooling - 750 Logitech MX518 
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post #4 of 9
Quote:
Originally Posted by landstander View Post
Thanks clearing that up. I still have voltage issue. 1.525v for 3.5GHz; >1.575 for 3.6GHz.
So how would I go about changing the memory settings? If you know of a good tutorial I would be happy to read it.
Perhaps you should try a lower clock and lower voltage first, then make sure it's stable. Work your way up slowly and don't make big jumps. Get something like OCCT to do some stress testing.

About the memory, I can't give any settings at all without knowing which specific brand and type it is. Neither can a tutorial. If you post back with the brand and type I can give you some settings.
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post #5 of 9
Thread Starter 
Downloaded OCCT. Now I'm going to lower my voltage to 1.45 and see what I can get stable.
I also had no idea that each stick of memory was so unique. I'm worrying that having two different brands in my case is what is messing it up.
My System
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CPUMotherboardGraphicsRAM
Phenom X3 720 BE Gigabyte MA78LM-S2H PNY 9800 GT 4GB 
OSKeyboardPowerMouse
Windows 7 64bit and Gentoo ABS PC Power & Cooling - 750 Logitech MX518 
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My System
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CPUMotherboardGraphicsRAM
Phenom X3 720 BE Gigabyte MA78LM-S2H PNY 9800 GT 4GB 
OSKeyboardPowerMouse
Windows 7 64bit and Gentoo ABS PC Power & Cooling - 750 Logitech MX518 
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post #6 of 9
Something that helped me out a lot was reading Logan's guide to Phenom II overclocking.
LINK

I am a novice at best with overclocking and the guide help my understand things a bit better. Check it out and see what you think. He also has a few other guides in his sig that might be helpful as well.

Good luck.
post #7 of 9
Dude, Black Edition or not, you forgot 2 important CRUCIAL things in order to have stable overclocks. You need to increase your CPU/NB frequency and NB Voltage. You can have a 4.5Ghz overclock, but you can be unstable if you don't increase the link between your RAM and CPU. This is what bottlenecking is.
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post #8 of 9
Quote:
Originally Posted by AMDZ View Post
Dude, Black Edition or not, you forgot 2 important CRUCIAL things in order to have stable overclocks. You need to increase your CPU/NB frequency and NB Voltage. You can have a 4.5Ghz overclock, but you can be unstable if you don't increase the link between your RAM and CPU. This is what bottlenecking is.
Actually that'd add a new possibility of instability. Its best to get your CPU to its maximum clock then raise the IMC Frequency for added performance, not STABILITY.
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post #9 of 9
Quote:
Originally Posted by landstander View Post
Downloaded OCCT. Now I'm going to lower my voltage to 1.45 and see what I can get stable.
I also had no idea that each stick of memory was so unique. I'm worrying that having two different brands in my case is what is messing it up.
Just a thought, i would definitely take the memory back for a matched pair of sticks. I've had this exact problem before. it will cause instability, bottlenecking, and BSOD's. If you put any extra money into anything right now. it should be a set of ddr2 800 sticks. Just my opinion
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Wet Willy
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OCZ Agility 3 RAID0 lite on dvd burner Raystorm Danger Den 480 Full copper (paralleled)  
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Dual boot, Windows7 64bit/Linux ubuntu64bit 1hpw2207h1680/1050  Sharp 60" LED 120hz s510 
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Ultra 1600w X4 NZXT, Tempest EVO logitech s510 combo Harmon Kardon AVR245 
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