First time overclocker here and first time user to this forum. I don't know how to start really so I'll just post my info:
AMD Athlon II X2 Regor 245
Reference Multiplier: 14.5
V-Core: 1.400 (+.05, stock being 1.35)
CPU / Northbridge Voltage: 1.275 (+.10, stock being 1.175)
Motherboard: Gigabyte GA-MA785GMT-UD2H
Cooling Unit: Stock
OS: Windows XP Pro 32-bit
Stressing Method: 6 hours Prime95 32-bit
Right now I have my HT clock set to 240 which gives me a cpu clock of 3480Mhz at 1.4 volts. The NB and HT link are both set to a x10 multi giving it a clock of 2400Mhz. I left the NB voltage at stock (1.1v?) because I'm not sure if raising it will do anything as I've read that increasing the CPU VID voltage (which I'm guessing is the same as the HT link voltage) results in better stability. I have the HT link voltage set to 1.275 right now.
I've been trying to push my HT clock up to 250 (CPU speed of 3625Mhz) while keeping the HT link and the NB at their x10 multiplier but I keep getting errors in prime95 after about five minutes. I've even tried pushing the cpu voltage up to 1.425 (I've seen specs online say that this is the max, I'm afraid to push it higher) and it didn't help. I then pushed the HT link voltage up to 1.35 and still didn't get stability. Any one have any suggestions on what to do to push my system just a bit further? Do I need to raise the HT link voltage some more? CPU voltage? Should I instead change the HT link speed downwards a bit as I have been reading throughout this thread? What about the NB voltage? Should I even touch it? Does changing the SB voltage do anything? Any help would be appreciated.
Before I did any cpu overclocking I made sure that my ram was stable first. I have two sticks of 2GB DDR3 1600Mhz ram. When I tried overclocking it I first set the HT clock to 240 with a ram multiplier of 6.66, effectively giving me a ram speed of 1599mhz. Memtest passed of course. I then set the HT clock to 245, my ram at 1632mhz. Memtest failed within five minutes with 67 errors.
I was bored at this point so I thought what the hell, I'll put the HT clock at 250 and see what I get, probably a lot of errors. Memtest passed more than seven times with the ram at 1666Mhz. Huh? I went back into my bios and looked through the settings, then I figured it out. When I overclocked my ram I thought it best to keep the HT link, NB, and cpu speed as close to stock as possible, so that I would rule out all possibilities that they would cause errors in memtest. With my HT clock speed at 245 I kept the NB and HT link multiplier at x8, with a speed of 1960Mhz, because it kept the speed as close to 2000Mhz as possible. When the HT clock was set at 250 it changed the NB and HT link speed up to 2000Mhz. So I dropped the clock speed back to 245 and upped the multiplier to x9, giving me a NB and HT link speed of 2205Mhz. My ram passed at this point. From what I can tell my motherboard doesn't like going below 2000Mhz very much, even just by 40Mhz. At least I know the problem isn't my ram now.Edited by silentphantom250 - 10/30/09 at 1:59am