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Amd cpu phenom over clocking help

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August 11, 2012 4:00:25 PM

Hello,
struggling to over clock new to this
over clocking amd phenom ii x 6 1055t
thermal take 450 w
asus m4n68t-m le v2 geforce 7025
corsair 4 g ddr3 16000mhz /pc3-12800 9-9-9-24

want to get around 3.5/3.6 ......upping fsb 230-264

multiple x 14

nbfrequency it doesn't tell me but been multipling fsb at the time by either x8 or 9 to get around or just below 2000mhz and

cpuover voltage vddnb over voltage ht over voltage no idea!!!!:-( I have put timings in memory not sure memory click value 400 mhz 533 667 800? and voltage been doing between 1.5 v-1.65........

save changes restart no bios posts just black screen hit restart bios says over clocking fail........help much appreciated I know there are done clever nuttahs that can help me out :-) .....some configurations and numbers please don't slate me I'm giving it a go
a c 78 à CPUs
a b À AMD
a b K Overclocking
August 11, 2012 5:25:09 PM

The trick is to limit the variables as much as possible.

Here's a cut and paste from my post on a 1045t thread the names that gigabyte uses may differ slightly from your BIOS:

I have my 1045t OC'd to 3.4 Ghz with all 6 cores running.

I recommend getting some free software first. CPU-Z and HWmonitor, and prime95.

CPU-Z will show you frequencies, voltages and ram timings.

HWmonitor will show you temps. *Be warned* HWmonitor was showing my core temps 10 degrees lower than they actually were. The temp labeled "TMPIN2" was actually tracking perfectly with the core temps shown in AMD Overdive. So look for the highest temperature other than your video card. (many video cards can safely run at hotter temps than your CPU.) The hottest one on my Gigabyte 990 fxa ud3 (other than the video card) is the core temp. Try to keep it below 55C under full load.

Prime95 is the program that will stress test your computer to see if it can remain stable and cool under load. 2hrs of the blend test with no errors and no overheating is a general rule of thumb for a stable OC.

Now for the fun stuff.

Go into your BIOS and lower the multiples for your CPU and your Ram by a few steps. (The 1045t won't let you increase the multiplier above stock)
Then disable turbo (aka "core performance boost" )
Then find your CPU Host clock control and set it to "manual"
Then You should be able to change the "CPU Frequency" (I'll call it FSB) (This is before the multiplier, so it will be low. Mine started at 200)
Now increase that variable by a bit.

I recommend balancing your FSB and your "memory clock" (RAM) multiplier to a point where your ram is back down to stock speeds after you bump the FSB. So raise your FSB to something like 250 then adjust your RAM multiplier down so that your RAM us running at or near stock speeds.

Now move on to your CPU clock ratio. With the faster FSB, you will be able to run your CPU at higher frequencies with a lower-than-stock multiplier. I eventually took mine all the way back up to 13.5 with a final frequency of 3.4 Ghz.

I would recommend starting with a lower multiple that gets you just a couple hundred Mhz boost over stock at first. Then test for stability and heat. Run prime 95 for at least 30 minutes if you want to see your hottest temps. The blend doesn't get things hot until about the third bank of tests.

If things look good, go back into the BIOS and bump the multiplier some more and re-test.

My MB got rather ambitious with the voltages when I left it in auto, so use CPU-Z to keep an eye on core voltages. Many recommend just staying under 1.45 volts. I recommend not going any higher than you need to for a given clock speed. This will help keep heat down. I ended up using a negative offset "CPU voltage control" of -0.075 volts. This brought my core voltages down to about 1.344v at full load.

*note* I'm scraping the floor on voltage with my particular chip/speed. One notch lower and I get BSOD. You may be able to go a little lower or you may need a little more voltage for your chip and clock speed.

Now just test and adjust and repeat.

Generally speaking:

BSOD means you need more voltage, and/or less speed.

Overheating means you need less voltage and/or less speed. (or a better cooler for your CPU.)

If you get to the point where your temps are good and your computer is sable, and you still want to go faster (than ~3.4Ghz), you can go back and bump up the FSB. But remember to adjust your RAM multiplier back down to stock-ish speeds.

You can OC your RAM later, but that gets a little more complicated as you may have to adjust CAS timings and RAM voltages to make it work. Keeping your RAM at stock speeds should give you one less thing to worry about while you probe the limits of your CPU.

Good luck!
August 12, 2012 1:44:16 PM

been using using cpu z and core temp...............i understand fsb when raised effects memory how will i tell what my speed is meant to be...... for the memory looked at the memory and spd tab on cpuz and cant tell if meant to be 667mhz 800mhz .....how will i know...... also can you just bump up voltage on cpu to around 1.45v and or do you need to raise bit by bit ....also voltage for cpunb what should i be looking around.......i am on right lines keeping nb frequency and ht around 2000mhz? .........if im not even getting bios when i restart where is the problem.................memory......voltage.........frequencies ? whats main culprit#?.

very much appreciate your help..........could you give me a couple of guessemations on some numbers like ....fsb ...multiplier..... cpu voltage ram speed n frequency nb voltage............ball park figures i can play and try tweaking..........thank you so so so so much
a c 78 à CPUs
a b À AMD
a b K Overclocking
August 12, 2012 3:16:24 PM

Check memory specs with your manufacturer (online of course) or just go back to "default" settings in your BIOS.. (Default doesn't always match factory specs but it's usually stable.)

I have never used your board, but mine shows the final frequency after I select a multiplier, in the BIOS. Use CPU-z to track your CPU speed and voltage, The BIOS should give you a clearer picture of what's going on with your RAM. (CPU-Z shows 1/2 the frequency shown in my BIOS for RAM)

I would just leave the NB and HT link in auto. If you don't have that option, try to set them both to as close to 2000 as you can get them. You can go back later and try to get that extra little bit from those after you get your CPU stable.


All this stuff interacts with each other, so you don't want to change a bunch of variables and then pull the lever on the slot machine and hope you hit the jackpot.

Try pushing your base clock (FSB) without pushing anything else. Put your FSB at something like 250 then go back and lower the multiplier on your RAM, HT link, NB and CPU so that they are all at, or near stock.

If your computer boots, then go back and up FSB some more. (and readjust your other variables back down to stock-ish speeds)

If it doesn't boot, then 250 is too fast for your MB and nothing your do with any of your multipliers will stabilize because they all need the FSB to be stable before thy can be stable.

270 seems to be the limit on my board but yours could be higher or lower.

Once you find your top stable FSB, you must then find an FSB frequency below that limit, that allows your various non-CPU multipliers to attain stock-ish speeds so that you can start pushing your CPU.

252 allows me to run at 3.4 CPU and just a hair over 2000 on my HT link and NB. My MB's auto setting bumped my NB to 2500 and it works, but don't mess with yours yet.

As for voltage, more voltage stresses your MB's VRM section. (Particularly with a 6-core CPU) You don't want to stress it any more than you need to.

I get very little benefit with my particular CPU from going over ~1.344v, so I don't stress my MB to put out 1.45 volts. (Or my CPU to take it)

!