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Why can't my rig get past 3.7 GHz?

post #1 of 13
Thread Starter 
Stock FSB is 200 MHz. OC FSB is 260 MHz.
Stock HT is 2000 MHz. OC HT is 1800 MHz.
Stock memory clock is 1333 MHz. OC memory clock is 1040 MHz.

Everything else is set to auto. BSOD after 1 min in Intel Burn Test.

My rig is in my signature.

Before it crashes in Intel Burn Test, CPU VCore hovers between 1.4V to 1.5V.
post #2 of 13
Thread Starter 
Here are some pics of the bios: http://hardocp.com/article/2009/11/02/asus_m4a785tdv_evo_motherboard_review/2
post #3 of 13
Thread Starter 
By the way, the motherboard can go above 290 FSB (I tested 290 FSB with a low CPU multiplier without crashes).
post #4 of 13
Thread Starter 
Anybody help please?
post #5 of 13

This may have something to do with two things:

  1. Generic 1333Mhz memory can hold back overclocks by making memory config process difficult (since it is not as flexible due to the generally bad capabilities of low binned, bottom end memory)
  2. Integrated graphics boards like the 785G are known to not ref-clock (proper term for "FSB") OC as well
post #6 of 13
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

This may have something to do with two things:
  1. Generic 1333Mhz memory can hold back overclocks by making memory config process difficult (since it is not as flexible due to the generally bad capabilities of low binned, bottom end memory)
  2. Integrated graphics boards like the 785G are known to not ref-clock (proper term for "FSB") OC as well

Regarding the 785G chipset, I tested it, and it caps at 290 MHz reference clock, so it can't be the motherboard's fault.

I ended up upping the voltage of the CPU to a 1.6V, and it still crashed. It can't be the memory's fault, right? Because it's running at a speed slower than stock. Also, is G.Skill a bad brand?

Edit: I increased the voltage of the memory of the memory from 1.5V to 1.52V, and that managed to fix it. I don't understand why it would need a voltage increase, since it's underclocked, but hey, it worked!
Edited by tahayassen - 3/11/12 at 5:27am
post #7 of 13
G.Skill is a good brand, imo. Could be cheaper RAM like stated before or just not made to handle the OC. Also, have you tried running memtest?
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post #8 of 13

What timings are you configuring at that speed? Auto?  That might be setting it to something like CL6 or CL5 which will probably not be stable any further.

You ideally want to configure a ref clock that allows you to run your RAM at what is rated or what is capable of and work up the CPU clock from there for best stability results.

 

Cheap generic RAM is a hit to flexibility in that it's harder to determine stability because there are fewer possibilities with such RAM and fewer settings that actually end up as stable.  Generic RAM is bottom-end RAM - that is, it's the spec bottom end and can use ICs not binned for overclocking.  When dealing with processors that require ref clock raise to OC, I always recommend DDR3-1600.  1600Mhz kits often cost the same and are a huge step up in binning and overclock capabilities.

post #9 of 13
Umm, is that not a C2 chip? None of my C2's can go much over 3.7Ghz.
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post #10 of 13
Quote:
Originally Posted by tahayassen View Post

Stock FSB is 200 MHz. OC FSB is 260 MHz.
Stock HT is 2000 MHz. OC HT is 1800 MHz.
Stock memory clock is 1333 MHz. OC memory clock is 1040 MHz.
Everything else is set to auto. BSOD after 1 min in Intel Burn Test.
My rig is in my signature.
Before it crashes in Intel Burn Test, CPU VCore hovers between 1.4V to 1.5V.

If you left everything besides the HT and memory on auto then you are also overclocking the memory controller when you increase the base clock speed. If you're are already overclocking you probably want to keep the memory controller overclock, so give the CPU-NB a little more voltage, I think 1.25-1.35v is where you need to be for it.
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