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Overclocking a ASROCK A785GM-LE Mobo

post #1 of 5
Thread Starter 
cpu im using atm is a Amd Athlon ll x4 635 propus

i need to know the settings to change to get the best performace out of my pc using standard air flow.
post #2 of 5
Thread Starter 
hope i get some feedback sometime soon.
post #3 of 5
I can most likely help you but first there are things You AND I need to know. First you...

1. Not all hardware will Overclock the same. Meaning My A785GM-LE may Overclock better than yours OR may fall well short of what yours can do.

2. You are doing this at your own risk. I can not be held responsible if something goes wrong and hardware fails.

Now I need to know , what ram do you have?

I am filling out my rig specs. just so you know i have the same motherboard and the Athlon II X4 640 in it right now so many settings may be the same or very close.

Because you asked what you did and how you asked am I assuming correctly you have never OCed before?
post #4 of 5
Thread Starter 
I have ddr2 6400 2 gig chips. Brand is G Skill.
post #5 of 5
Because of the the multiplier being locked on the CPU the only way to increase the frequency of the the CPU is to change the "CPU Frequency (MHz) " in the bios under OC Tweaker.READ ALL OF THIS BEFORE DOING please.

Here is my Bios set up. WARNING my voltages my not work for you!!

OC Tweaker

Overclock Mode -- [ CPU,PCI-E Async.] This allows us to change the next with out it being tied to the PCI-E Bus.

CPU Frequency (MHz) -- [230] -->this increases your core clock on the CPU. MINE 200 = 3.0Ghz / 230 = 3.45 Ghz. This ALSO changes the Ram speeds 200 = 800MHz/ 230 = 920Mhz.

PCIE Frequency (MHz) -- [100]

spread spectrum --- Auto

Advanced Clock Calibration -- Disabled

CPU active core control -- Disabled

Multiplier/Voltage Change -- Manual

CPU frequency multiplier -- [x15.0 3450Mhz] -->this can only be moved down if the CPU has a locked multiplier.

CPU Voltage -- [1.35] this MB has bad voltage regulation and readings so 1.35v actually equals 1.38v so be careful.

NB Frequency Multiplier -- [ x9.0 2070 Mhz] my board does not like anything above 2070MHz for the NB & HT. If i go above this it will crash.mad.gif

NB Voltage -- [1.2000 V ] set this one dead on like this. I have tried 1.2250 V @ 2084 MHz but still crashed and i got a bit nervous of frying the North Bridge so i didn't go any higher in an atempt to reach a high HTT & NB Frequency.

HT Bus Speed -- [ x9 2070 MHz] this can not exceed the NB frequency the bios prevent it but can be set lower. Not so good if your looking for performance.

HT Bus Width -- [ 16 Bit ]

CPU Thermal Throttle -- [ Disabled ] For a beginner I recommend leaving this on auto just in case your CPU gets to hot. It will throttle the CPU to prevent damage. you can disable this if you keep an Eye on your CPU temps during hot & stress periods


1. Changing the CPU Frequency WILL change the RAM frequency. This means you should test your ram to make sure it is stable at the frequency you set the CPU at. Download Memtest86+ at http://www.memtest.org/#downiso download and burn an iso disk to boot from. If you need an ISO burner here is a free one. http://infrarecorder.org/?page_id=5 once you set the CPU frequency run this program from the boot screen. let it run for 20 passes to see if the memory errors.

2. CPU multiplier can be dropped but not raised on a locked CPU. My multiplier will be different than yours so to start with just leave it at stock settings.

3. CPU VOLTAGE!! this can kill your CPU. Max I would go on your chip would be 1.45 ACTUAL!! I stress actual because the bios settings don't always mean that 1.2V = 1.2V there are fluctuations in the voltage on this board. The same holds true with my gaming rig. Here are two programs that monitor voltage. Hardware monitor http://www.cpuid.com/softwares/hwmonitor.html And CPU-Z http://www.cpuid.com/softwares/cpu-z.html

4. some other free tools to check stability with . INTEL Burn test. http://www.softpedia.com/get/System/Benchmarks/IntelBurnTest.shtml , OCCT http://www.ocbase.com/ ,

Memory Configuration.

Memory Clock -- [ 460MHz DDR2_920 ] this reflects the speed that the ram will run at while overclocked. this changes on its own as you change the CPU Frequency. SEE EXAMPLE IN SECTION ABOVE.

DRAM Voltage -- [ 1.80V ] set this to what your Ram manufacturer recommends

Memory Timings -- set this to what your Ram manufacturer recommends. Because I have had this ram for a long time and know it quite well I can actually run stock timings Over 920 MHz. but it took time to learn that from using Memtest and changing the FSB and testing many times over.

Chipset Settings

This you are on your own be cause I run a Discrete GPU and its Nvidia so no Hybrid Crossfire for me.

Stress testing is a major part of a Stable Overclock. I have given a couple of links to some free ones so please use them. You dont want to be working on something and have the Machine crash and loose all of your work. Here is a good thread to read BUT, READ the hole thing Before doing. http://forums.anandtech.com/showthread.php?t=2195063Google is your friend on how to use these programs.

I hope this gives you a starting point just be careful of voltages.

let me know how it goes or if you need more help. thumb.gif

PS: All software I have linked is freeware so no charge.
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