15 replies to this topic

[biker9075]

Well I finally did my first CPU overclock. But I have a question, first I will list my system specs:

CPU- Intel E6750

Mobo- Abit IP35-E

RAM- 2 (soon to be 4) GB Crucial Ballistix DDR2 800

Heatsink- Arctic Cooling Freezer 7 Pro

PSU- OCZ GameXtream 700W


So I bumped the FSB to 400 and left the multiplier at 8 making it 3.2GHz and bumped the voltage up to 1.35v. And someone told me that I should lower the DRAM frequency from 800MHz to 667MHz. Is this right? I just did a stress test for about an hour and temps didn't break 53C

[RTB]

It wasn't stable at 3.2 Ghz at stock voltage? You should never increase the voltage if it's stable without the increase, because clock speed gives a linear increase in wattage, voltage affects it exponentially.
Dropping the DRAM frequency doesn't make any sense, if you have memory capable of running at 800 Mhz using a divider makes no sense. Running a 1:1 divider is even believed to give a slight performance increase. Also, which stress test did you use?

[biker9075]

the voltage is actually set to 1.3125 which is the lowest the bios will allow. however cpuz shows more like 1.264v under load. The first stress test I used was Burn in 2008 and temps didnt break 53C. But when I used prime95 it got to about 60C

[mudmanc4]

I used a burn in program once, it's supposed to literally burn deeper routes in the cpu, I allowed it to do a full run, something like 36 hours.   The cpu was a AMD 3200+ , that was almost 5 years ago, and it's still running fine, but who knows really what it did.

Learning to OC is an art, you really have to learn each component , and know there limits as well as how they work together .  It gets rather addicting. Unless you have a liquid cooled system, chances are you won't reach much higher than 20% of the stock value.  It depends on the MB, and all the devices.   Sounds like RTB knows his shit, might want to call on him when you keep resetting the bios     get used to it while learning the limits.

[biker9075]

haha, i dont think I'll need a bios reset. I got it stable at 3.2GHz. Of course later on im sure I will keep bumping that up and prollly needing a bios reset haha

[biker9075]

CPUZ says my DRAM frequency is 480MHz. But I have it set to 800MHz. Did I do something wrong?

[RTB]

At least he got the simple system with Intel stuff. The number of settings you can tweak on an AMD system (especially DFI motherboard with Phenom) borders on insanity. I've yet to try one of those, but at least I got a good taste of it with the old school DFI Ultra-D.
I guess he could get about 3.6 Ghz 24/7 stable out of it, but in a bad case he'll need lotsa volts and his CPU cooler is mid segment, nowhere near the Thermalright Ultra Extreme and similiar coolers. Intel 65nm Conroe CPUs are usually good overclockers, 1 Ghz OC isn't absurd. Just note that if you go any higher, you'll have to either put the memory on a divider or OC it as well. Also, 4 sticks of memory is much harder for the memory controller than 2, you may have to do some tweaks at the MB section to keep things functioning, unless you're going to switch over to 2x 2GB of course.

[mudmanc4]

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CPUZ says my DRAM frequency is 480MHz. But I have it set to 800MHz. Did I do something wrong?

No you didn't , see it's now that the truth shows itself.   It's a misnomer, ( for marketing ) it's split between the ram, and the CPU, like when it says 800 MHz, its really 400 MHz, , see ?  So you have  " upped the Mhz by 40.

[Buntz]

Quote

the voltage is actually set to 1.3125 which is the lowest the bios will allow. however cpuz shows more like 1.264v under load. The first stress test I used was Burn in 2008 and temps didnt break 53C. But when I used prime95 it got to about 60C

CPU voltage droop is normal for a Intel processor. My is set to 1.325 in the BIOS and Cpuz read it at 1.296.

Here is a thread that will explain it to you. Scroll down about half the page to find the information.

http://forum.xcpus.c...repository.html


My Xeon X3350 is running at 1.325 volts with a overclock to 3608 MHz from a start of 2660 MHZ.

[biker9075]

ohh okay i gotcha. makes sense now

[biker9075]

Another question...when I OC'ed my CPU I noticed that the system would hang for maybe 5-10 seconds when loading a program. So I loosened the ram timings from 4-4-4-12 (stock) to 5-5-5-15. Is there something else i could do? Or isn't there much performance difference between the 2?

[Buntz]

Programs should not hang up because you overclock. How long did you run prime 95 to make sure that your overclock is stable? You should run it for at lease 6 hours,I run it for 24 hours to check to make sure my overclock is stable. Also check your memory voltage in the BIOS,some motherboards get it wrong. Are you running the memory divider at 1:1,Intel processor prefer it at that setting.

[biker9075]

turns out it was the memory divider. It somehow got set to 5:6, everything seems good now. Last time I ran prime 95 it was for about 8 hours, i am going to do a 24 hour test later on

[Buntz]

Glad to here you find the problem and was able to fix it. Before you run prime95 set your ram back to 4-4-4-12[ if you have not done it already ], it might work now.

[biker9075]

just ran a 24 hour prime95 test and all looks good 

[RTB]

Quote

just ran a 24 hour prime95 test and all looks good 

Famous last words.