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Successfully Overclocked Phenom 840, Ram giving troubles!

post #1 of 6
Thread Starter 
I have a Phenom 2 X4 840 (locked multiplier) and an asus MOBO. Stock the cpu is 3.2GHz at X16 multiplier. I have it overclocked and stable at 3.750 Ghz by bumping Reference clock to 250 and X15 on the multiplier. The Cpu/NB Frequency is 2500 MHz and the HT Link is 2000 MHz(stock speed). With this particular CPU/HT Ref Clock setting of 250 I have a 1:2 Ratio and that has my Ram in CPU-z at only 500 MHz. I have two 4gb sticks of Patriot RAM and it is rated 1333MHz. The highest I have been able to get the RAM is to 637.33 MHz (in cpu-z) by setting ref clock to 239 X15.5 (puts processor to 3.704 GHz) that is because the ratio was 3:8 or (239X8/3) so ultimately it gives me 1274.66 MHZ being that its DDR(multiplied by 2) Sorry for rambling Im just tryign to figure out the best way to explain this. Should I just be happy with that slightly slower processor speed and the 1274.66MHz RAM?? or am I missing something. I have adjusted no voltages. Prime has been ran on both settings for an hour each and only reached 46C. This is my first overclock and for the last 4 days or so I can honestly say Im addicted lol. Any help would be appreciated thanks!

I have cpuz screenshots but some reason having troubles uploading them to the thread. I can email I guess if u really wanna look at em

sorry bout that im a newbie, here are the cpu-z screenshots! Thanks again!
Edited by dstoler - 9/24/11 at 8:54pm
    
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post #2 of 6
You need to raise the memory frequency in the bios one notch to 1066,and increase dram voltage to 1.65v.
That will put you at 1333,with ref clock of 250.

Here's a handy chart for ref clock ocing http://www.overclock.net/amd-cpus/594829-phenom-ii-cpu-northbridge-ram-chart.html

What Motherboard do you have btw?


Good luck

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post #3 of 6
Thread Starter 
Asus m5A 78L-MLX its a cheaper one but I'm a first timer and didn't wanna go all out ya know? There isn't a setting in bios for 1033 so I'm thinking that 637.33 (times 2) is highest I can get with 239 ref clock. The voltage is 1.69 for ram. Bios setttings only go to 800mhz for ram but set to auto I believe (I'm at work). Everything is stable just stopped prime (the highest processor demanding stress test) it ran for 7 hours with 46C temps. When I get home later ill get screenshots of the 239ref settings its currently on if I set to 240 the ratio changes to 2:1 instead of 3:8 and ram clock in cpuz is 480mhz
    
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post #4 of 6
First of all, the actual RAM frequency is double what is reported in CPU-Z, due to dual data rate. I see you know this.
Second of all, fill in your system specs in sig.
Third of all, try putting the ref clock at exactly 250Mhz and use RAM multiplier x5.33. I doubt you will be able to go much further than this due to the particular kit you are using - a Patriot 1333Mhz kit, probably at CL9 latencies, probably at the horrendous 1.65V they spec, resulting in low binning, no RAM overclockability, and the obvious - RAM problems. Lower any other multipliers (i.e. CPU, NB, etc.) to compensate for the higher ref clock speed. Ensure timings are set MANUALLY.
Edited by xd_1771 - 9/25/11 at 11:08am
post #5 of 6
Thread Starter 
My bios doesn't have a ram multiplier only 400,533,667 and 800mhz options and I did set nb to 250 X 15 clock and it automatically changes multiplier to 2:1 for ram ratio I mean. And that's only 500mhz (250X2/1 (which is only 1000 mhz) for ram. But I do like the nb freq being stable @ 2500mhz and ht an even 2000mhz. Because to get ram up past 1000mhz I gotta use 239 ref clock and that raises ram to1274.66mhz (with voltages to 1.69) but my nb drops to 2390mhz and my ht is either 1900 or 2190 give or takewhich I don't like either. Def getting a black edition next time lol but for sure learned a lot this past week or so!! Thanks guys
    
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post #6 of 6
Set memory clock mode to manual,then set memclock value to 533.


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4x2gb OCZ ddr2 1066 plats seagate 320gb sata lg supermulti dvd WIN 7 64 
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acer p221w ms SS ST75F-P 750w CM 690modded w/KazeMaster pro 
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