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Problems OCing CPU and GPU

post #1 of 9
Thread Starter 
Okay, I am not sure this is the correct section to post this but it looked like the best I could find.

In summary of everything that is posted below, I have OC my i5 750 2.66ghz to 3.6ghz and can't go any higher without it not booting up. Temps when at 3.6ghz are 50 full load, 25-30 idle. I also have a massive gtx 570 by asus (dc2) which is supposed to have MAJOR cooling to OC to 580 specs. But I am having trouble doing a true OC on the 570 as well.

So problem here is of course I can't OC my CPU past 3.6ghz, and then I can't OC my GPU past 790 (standard at 742) when I have seen vidoes stably OC it to 935.

Is this because I am providing massive power to the CPU that it leaves little power else where in my system to OC?

System specs...
MOBO - MSI p55m gd45
CPU - i5 750 2.66ghz (OC to 3.6ghz atm)
GPU - ASUS DC2 gtx570
RAM - 4gb ddr3
PSU - Corsair tx750w

So yea, as stated above I can't go past a 3.6ghz OC on the cpu without the bios trying to start it up and reseting because it can't boot it up at any higher speed.

I also can't OC the 570 past 790 without getting performance issues and crashes in games. Even at 790, the old republic has been working fine, but when I go to play BF3 it will crash on me every 5-10min. Temps when at full load and crashing are around 60. I will admit hotter than it should be, maybe has something to do that I have my system stuffed in a micro atx case atm. Either way, I don't think I should be getting card crashes and errors popping up saying the driver stopped working at 60 C.

So I am guessing this is a power supply problem? I figured my corsair 750w psu would have no problems handling this so I am still a little confused.
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Green Beast
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post #2 of 9
I might be able to provide some help in this area...since i have a GTX 570 DCII, a I5, and a Corsair 750 Watt PSU.

You said "Is this because I am providing massive power to the CPU that it leaves little power else where in my system to OC?"

The answer is easy, but the explication is complicated. biggrin.gif Hope you like math and physics!

Power (in watts) = voltage (in volts) * current (in amps). Power supplies keep a constant voltage. When a you need more power, it keeps the voltage the same and adds more current to give you more power.

CPU's and GPU's run off the +12V rail. The question you need to ask is "Can my power supply provide enough amps on the 12V rail?"

If we look at the data sheet for your power supply, it has a 60Amp or 62 Amp (depending on the version) +12V rail.

Your GPU might use around 30 Amps overclocked and the processor 10 Amps overclocked. Your probably using 40-50 Amps of your power supplies 60 Amps on the +12V rail. (hard drives also use the +12V rails, but they have a minimal inpact...unless you have like 10+ hard drives)

In laymans terms: Your power supply is fine.
(Sorry, i am a Engineer. I get excited when i talk about math and physics)

___________________________________________________________

I have a I5 2500K, so double check me about temps for the i5 750. 50 C under full load is considerably cool. What voltage is your processor running at? What ever it is at, you can probably increase it. :-)

_____________________________________________________________

Your GPU being 60C has nothing to do with it crashing.

For overclocking the GTX 570, get the Asus overclocking utility. Overvolt it (slowly while watching temps).

If your GTX 570 DCII is like mine, you can over-volt it to the max twithout worrying about it going over temperature. It can handle lots and lots of extra voltage without breaking a sweat.

Asus didn't follow the Nvidia recommendations on the schematic for the DCII GTX 570. They gave it a power supply that can handle 15% more amps than "regular" GTX 570's.
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post #3 of 9
Thread Starter 
Thanks for the help! Two things though. First, I am not familiar with voltage changes via the bios. I know the basic go in and change the ghz but thats it. Supposedly my mobo is super friendly for OCing but I guess if I am shown how I can mess with the voltages.

Secondly, I am using the ASUS OCing software, SmartDoctor. I got it directly off the site when I revived the card a week or so ago so it should be the most recent. Like I said, I hit 780 and up on that card and experience game crashes in BF3. Anything over 800 leads to screen tearing and a eventual crash or it just doesn't even load the game without displaying the driver failed notification in the system tray.
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post #4 of 9
Basically, you need to over-volt your CPU and GPU if you want to go faster.

It would take me a lot of writing to go into detail on how to do over-volt your CPU. OCN has a TON of information already posted on how to over-volt that processor. Do some digging around on OCN, and your find some good information. Dig through the "stickied" threads. If you have any questions after you did some reading, i'll try to answer them.

If your running the stock heatsink (or a "basic" aftermarket heatsink) your reach your "max" safe temperature long long before you reach the "max" safe voltage. A little bit of voltage increase has a big impact on temperature. Take your time, watch your temps, and your be fine. biggrin.gif

Are you over-volting your GPU in the Asus SmartDoctor software? You don't over-volt the GPU in the BIOS, you do it in SmartDoctor. In Asus SmartDoctor, keep adding voltage and watching temperatures. As long as your temperatures are fine, the extra voltage won't hurt your GPU.


My GTX 570 DCII is running at 920MHz clock, and i had to over-volt it to the "max" that SmartDoctor would allow.

My 2500K I5 is running at 4.7 GHz, my voltage is at 1.43 V
Edited by crimsontears809739 - 12/21/11 at 8:40am
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post #5 of 9
Thread Starter 
I will take a look at that, thanks!

As for the GPU again, like I said I am using the smartdoctor program to OC. I am not entirely sure how I overvolt it via smartdoctor though. Any suggestions?
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post #6 of 9
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post #7 of 9
Thread Starter 
This is all I see...

SD.jpg
Green Beast
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Green Beast
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post #8 of 9
I am on vacation, so i only have my work laptop. My computer with the GTX 570 is 300 miles away right now, and i won't be home again for two weeks.

Somewhere i bet there is a option in the software to enable over-volting, and you have to click a "I promise not to sue Asus if i blow my card up" agreement.

Perhaps you could start a new thread, because i won't be able to help you solve this problem until i get home in 2 weeks. idk, title it something like "How to over-volt using Asus SmartDoctor?".

Good luck.
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Deus Ex Machina
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post #9 of 9
Thread Starter 
I will look around and see if I can find it, if not I will just start a new thread as suggested.

Thanks for all your help man!!!
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Green Beast
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