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AMD® Phenom™ II Overclocking Thread

Pump the vcore. The max for that chip is 1.55v I think. (Pretty sure that's right for C3).

Are you keeping an aye on the temps while you are stressing it?
 
I think you may be looking at your limit without better cooling. Phenom II x4s are supposed to be kept below 62°C. I prefer to stick several degrees below that.

Edit: Muel - temp is in the screenshot. 57°C when it was taken with a high of 60°C recorded.
 
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Highest the temp has hit is 60 (didn't see it hit that but its on the max on coretemp so must have blipped it), generally between 56 and 58.
As said, the only things i have touched as shown in my bios photo is the multi and cpu volts, would anything else help it get stable at 4ghz as it booted and super pi'd at 4ghz no problem but prime caused bsod.

What about the HT link, memory clock or cpu nb volts ?
 
Ah yes. I see now.

Also when overclocking Phenom IIs, a completely stable overclock may become unstable at higher temps. I've found before that when it reaches about 58-60C it might start crashing, but by clearing the dust out of the HSF the load temp dropped to 53C and it was stable again. Dunno about the C3 chips but it's certainly the case on my C2.
 
2jazp81.jpg


Phenom II x2 555 BE , unlocked to X4 cores and slight overclock. Not pushed it any further yet as its busy encoding my dvd's :).
Everything at stock except multiplier, using a cheap Asus M4n68T-M-LE-V2 MB. Cooler is a Scythe Shuriken BIG as this is my HTPC unit.

Core temps get disable when unlocking extra cores, but stress tested it with 2 cores and looked at the diff between CPU temp and Core Temps, CPU temp on MB is on average 8deg higher than the core temp reading :)
 
Muel said:
Pump the vcore. The max for that chip is 1.55v I think. (Pretty sure that's right for C3).

Are you keeping an aye on the temps while you are stressing it?
Click to expand...

Yep and dont forget you can always get 1.65v by squeezing an extra 0.10v using the v-core offset option in bios. This is cooling permitting tho so be careful you dont cook your chip.
 
Max is 1.55v though?

I'm wanting to boost my scores in graphics benchmarks, primarily 3Dmark06. When I ran it at 3.4 ghz then 3.7ghz I got a nice increase. I can't really push the CPU further though because my cooling is compromised. Would overclocking the NB/NB-CPU/HT Link (not sure if you even can OC the NB-CPU) give me a boost? I can't get my RAM to 1600mhz either, it won't even boot at that. It's at 1333mhz at the moment but I'm told this won't effect my benchmark scores mych at all?
 
Dreadi said:
I've just noticed my ram is at 1333 in the bios as well when its 1600 ?
Click to expand...

Rev C2 chips only support up to 1333. Your C3 supports 1600 (for 2 RAM sticks anyway). Your BIOS might not be set up for it though.

AMD advise that the CPU-NB speed be set to 3x the single data rate equivalent speed of the RAM. So (1333/2)x3 = 2000. (1600/2)x3 = 2400.

I have heard people getting C2s to run with 1600MHz DDR3 by overclocking the bus speed to 240MHz, with the CPU-NB left on a 10x multiplier for 2400MHz (plus any voltage boost required to keep that stable). RAM speed in BIOS should be left to 1333 and it will raise to 1600 with the bus overclock.
 
Uriel said:
I have heard people getting C2s to run with 1600MHz DDR3 by overclocking the bus speed to 240MHz, with the CPU-NB left on a 10x multiplier for 2400MHz (plus any voltage boost required to keep that stable). RAM speed in BIOS should be left to 1333 and it will raise to 1600 with the bus overclock.
Click to expand...

I'll have a crack at this later I think, would be nice to get my ram to run at it's proper speed!

Any idea what kinda CPU-NB voltage I'll need to get it stable?
 
Dunno, but I've found that if CPU/NB voltage is too low S&M is a very good test. If it's too low S&M won't even start its stability tests so you'll get an instant idea whether it needs a boost.

Actual voltage will depend on your chip.

Don't forget to drop the main multiplier if you're overclocking the bus.
 
Had the first attempt at clocking my 1090t tonight and thought straight away that 4ghz was my target. Went into the bios and changed the multiplyer to 19 and the bus to 211, ht link at 2110 for 4ghz - leaving a big ram divier to keep the ram underclocked. powered it up fully expecting to have to tweak a few settings to get into windows but not at all in it went.

Fired up 3d mark vantage and done a few loops, no problem so have just started a blend test, is 4ghz really this easy on these chips?

Untitled-8.jpg
 
good stuff, so where am I likely to find the most performance with this chip? Should i clock the bus, ht or multi? or find the max fsb and ht then adjust the multi for the best possible clock speed?
 
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