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Phenom II x6 1045t and M5A78L-M LX OC question

post #1 of 18
Thread Starter 
As the title states, I have a Phenom II x6 1045t and M5A78L-M LX plus mb. I was wondering if I would be able to over clock the processor at all. Right now I have core 2 and 3 turned off, in case that matters. Thanks for any help you can provide.

link to mb (http://www.microcenter.com/single_product_results.phtml?product_id=0379475)
Graphics card is a radeon 6670
Ram is 2x4gb corsair 1333 ddr3
Edited by mgaugha2 - 3/29/12 at 4:41pm
post #2 of 18
Why do you have two cores turned off ? Are they not working well ? Did you disable them in the Bios ?

That board only has 4 VRM's without heatsinks, I don't know how far you can safely overclock a 45 nm 125w TDP CPU with that board, but the chances are better if you are working with 4 cores. Is that why you disabled two cores ?

In any case, that does not seem like an overclocking board. Micro-ATX boards rarely are designed for overclocking anyway (unless they are from the Asus ROG Gene series), and the fact that one has a lower end chipset, integrated graphics and 4 VRMs that don't have a heatsink, is all indicating you should be careful or you might fry your board and possibly your chip too.

You should be safe overclocking up to 3 Ghz or slightly more, with voltage that is the same as a 1090T or a 1100T because the board is supposed to support those, but I'd be extra careful because you will be overclocking the northbridge in your case too given that your CPU does not have an unlocked multiplier.
Edited by tpi2007 - 3/29/12 at 5:14pm
 
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post #3 of 18
Thread Starter 
Yes, I disabled 2 of the cores through the bios because I figured it'd be easier to over clock with them off. Do you have any suggestions for how to go about safely over clocking this? I have prime 95 and cpuid downloaded.
post #4 of 18

The 1045T is actually a 95W TDP processor.  However, this board is not build for anything past 95W TDP as per ASUS ratings (noting that while the PLUS is rated for 125W TDP processors, its close [well, it's pretty much exactly the same in VRM setup] brother the M5A78L-M (bar the plus) does not - and the PLUS TDP rating should be following that of the identical board - if reliable 125W TDP processor operation should not be expected with one variant, the same expectations should be met across every board using the exact same VRM design.  Don't expect to be able to run the processor reliably at all at 1100Tish settings with 3.3Ghz and higher voltage, thus approaching 125W processor TDP, with 6 cores.

 

There is no failure risk (or little if at all) for VRMs on ASUS boards due to the presence of throttling-based over-current protection.  This is a GOOD THING in that it is there.  However, it may also reduce your performance because of the relatively incapable and low capacity VRM setup it has to protect.

 

You may lose more performance than you gain by overloading the VRMs by overclocking with 6 cores.  With 4 cores, reducing the power consumption by a significant portion, that may be a different story.  No matter what happens, DO NOT LEAVE YOUR VRMS WITHOUT ANY COOLING (i.e. tower heatsink + no VRM heatsinks) - denying the VRMs any method of heat dissipation whatsoever increases the danger (or chance of unreliable operation) very significantly.

 

By the way, your DDR3-1333 RAM is going to hold you back well before the VRM setup is, I reckon.  You will be able to manage a 700Mhz overclock to 3.4Ghz (250Mhz bus clock, 1333Mhz RAM speed via x5.33 multiplier) and not much further because going further ideally makes use of higher-speed RAM than 1333Mhz.  However, generic 1333Mhz CL9 RAM is... well... generic.  It's bottom end.  There's really no need for a binning process that defines whether the IC is capable of generic specs because all DDR3 ICs must be capable of generic spec standards set by JEDEC, at 1.5V.  Even those that will not OC to 1600Mhz.  I always recommended DDR3-1600+ RAM that is definitely binned for overclocking and has much higher flexibility over generic memory kits with multiplier-locked processors.  On processors such as the 1055T, I considered it an absolute minimum.

post #5 of 18
Thread Starter 
Thank you, that post was quite helpful.

I have the stock CPU cooler, which if I'm not mistaken works to somewhat cool the VRMs. I have a haf 912 with 2 front intake, 2 exhaust on top, 1 in the rear then a side mounted fan (all 120mm). I have an 80mm that I should be able to mount inside the case as well, if need be. As far as processor speed, 3.4 is even more than I wanted to get to, so that is good news (not opposed to running this at 4 core instead of 6). Would I be able to approach 3.2 with 6 cores or will that be too much of a draw as well? If not, it is fine at 4. Since this processor is locked, how would I go about over clocking it? I'm sorry for all the questions, this is my first time trying this.

Again, thank you very much for your help.
post #6 of 18
Thread Starter 
What is the highest the temperature should get for the cores? I've read between 60-63 C. Is this correct?
post #7 of 18
Actually, you did the right thing by disabling two cores.

Like XD said above, you will be putting strain on your mobo VRM's.

Disabling two cores lowers the TDP by 1/3, so you should be able clock it nicely and not strain your board. I bet you can reach 3.6GHZ or so on stock voltage without a problem, maybe even 3.8GHZ. I wouldn't push higher than that unless you either disable another core, or put some heat sinks on the VRMs.

A lot of people think disabling cores is stupid, but really for most games, 3-4 cores is enough, and higher frequency is more important for most games.

Then, for heavy threaded tasks, you simply re-enable cores and back your frequency down. I used to use BIOS profiles to do this quickly on my old Thuban.

For all of your overclocking needs, print out the .pdf in my signature and reference it to your BIOS. Any questions, feel free to ask.
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post #8 of 18
Thread Starter 
I currently have it at 3.2 ghz running at 61-62 C on cpuid and under the heavy (the one that says most heat) during prime95 test. Is there anything I should do to lower the core temp to be able to raise the frequency? Is it ok to go over these temps? Again, thanks for all the help
post #9 of 18
Quote:
Originally Posted by mgaugha2 View Post

I currently have it at 3.2 ghz running at 61-62 C on cpuid and under the heavy (the one that says most heat) during prime95 test. Is there anything I should do to lower the core temp to be able to raise the frequency? Is it ok to go over these temps? Again, thanks for all the help

Short answer: yes.

Put all of your rig specs in your signature.

Cooling has lots of variables, much to do with your case layout. There is also some easy modifications for stock coolers that can help out a couple degrees, such as changing the TIM (stock is usually way too much), lapping, using a better fan, ect.

Which AMD stock cooler do you have? There are several different versions ranging from piece of aluminum, to piece of aluminum with copper core, or even one with copper heat pipes and aluminum fins.

You can also undervolt your CPU, and this requires as much skill as overclocking, and the rewards are great.

That 61-62 C is definitely going to limit you until you get it down. I personally wouldn't push over those temps, but also remember that normal use won't make your CPU as hot as a stress test.
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post #10 of 18
Thread Starter 
I updated my sig. Let me know if you need anymore information

This is what the cpu cooler looks like http://cfile21.uf.tistory.com/image/196BF61C4A32868C8310B7
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