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Need Opty 170 Oc Help

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I am having big problems with oveclocking my system. I can only get it to run stable at 2.3(231x10). I have used the Definitive guide and have a couple of questions about it.

 

1. When it says to find the max of your CPU by testing it first and then changing the LDT/FSB Frequency Ratio (Ram Ratio) to 100(Mhz)(1/02). Is this talking about the DRAM setting???

 

2. What does changing the LDT/FSB to 2.5 or 3.0 actually doing??.

 

this is what I have so far:

 

FSB 231

LDT/FSB 3

CPU/FSB 10(Default)

PCIE 100(Default)

CPU VID Start 1.35(default)

CPU VID Control Auto

CPU VID Special Auto

 

I have tried changing the DRAM to 9/10 which gets me to 2.5.-3-3-7

instead of the 3-3-3-8 which came as the factory setting. But as far as I can tell that does not make any real differecnce in stability. (this I could be wrong about).

 

I have tried using a FSB multiplier of 9 and a 9.5( which is not reccomended) but nothing seems to help. Anything that I have tried higher than the 231x10 gets me to a state where my system will not boot at all and I get to the "boot into safe mode" or change bios setting screen. :confused:

Any and all help would be greatly appreciated.

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LDT relates to the HTT bus which is 2000 for the socket 939, going over the 2000 causes unstable OC most of the time, I say most of the time because I have seen others go over and ran stable. Here is how it works and I hope I can make it clear to you. Now if your htt is set at 250 and ldt is set at x4 that would be 1000 @x2 DDR HTT would be 2000. Now as you can see, going over that 250 and using ldt x4 would be over that 2000, then you can use ldt x3 to make it just below 2000. 260 x 4 = 1040 @x2 DDR HTT is 2080 so you can lower to ldt x3 if you get unstable. Now with the vcore control I'd suggest setting the VID Control and VID Special yourself, if set it at 1.35 @ 104% that would be roughly 1.40 vcore, 1.35 X 1.04. It is recommended that you do not go over 1.65 vcore, and watch your temps as you increase the vcore, OK. :)

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Oh, I did not take a good look at your sig. You may want to get a better PSU, I do not wish to offend you but I have had a very bad experience with that PSU that came with my X-Alien, it is a piece of crap, almost killed my first build and I'd suggest getting a better one before attempting to OC your system. Sorry if I am too bold but I don't want you to find out the hard way. :angel:

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Hey thanks Voltes!!! Thanks again for the speedy reply.

 

One thing though is what is the LDT/FSB Frequency Ratio (Ram Ratio) to 100(Mhz)(1/02).

 

Is this the DRAM setting or what exactly is this. I am still not clear on this.

 

Also I replaced the previous power supply with this one as my old 420 watt supply would not even boot up my machine without it being unplugged and plugged back in for about 2 mins. This supply has dual 12V rails and has fixed the non-booting problem but replacing it is not out of the question. Also to address your previous quote:

 

"Now as you can see, going over that 250 and using ldt x4 would be over that 2000, then you can use ldt x3 to make it just below 2000."

 

I understand how the math works on this one but what I don't get is what exactly is the CPU/FSB multiplier do then??? My system will allow it to only go to X10 which is fine but my FSB setting will only go as low as 200 and go up to 450(or something like that) so now what do I do??

 

Again any and all assistance is welcome and appreciated!!

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Here is a picture, that LDT/FSB is that x3 or x4 we discussed on the equation. That is an actual bios shot that I am using, as you can see mine is at 305 x 3/915 @DDR HTT of 1830, below the 2000. Right now I am currently testing prime with that setting but at 300 with my 4GB Ballistix. So far it is 4 hrs and still running :nod: That CPU/FSB ratio is your cpu multiplier. As you can see, I have it at 305 x 9 so my CPU is OC'ed at 2.745 and that my friend is prime stable for almost 11 hrs. That is the advantage of your Opty 170 because you can go up to x10, the 165's can only go up to x9. Read the OC'ing guide and understand it fully and you will get the full potential of your cpu.

 

IMG_0143Small.jpg

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Yeah!!!! You have painted a great picture and made it clear as crystal. The 305 FSB is used to multiply both the RAM and the CPU. The 305 X 3 (LDT/FSB) = 915 @DDR HTT of 1830 and the same 305 FSB is to multiply the CPU/FSB to get the CPU frequency(2745). OK now what I am left with is the DRAM. Does it effect the stability of the system if it is changed or what. I am not left with a lot of things that are restricting my OC'ing ability unless it is my low voltage settings. This is how the Definitive guide should explain it. It does not say that the FSB # is used to determine both the CPU and the RAM frequency.

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Oh yes it does my friend, it does. The beauty of it is that when you have the HTT set at 305 and your ram cant possibly run 1:1 with your cpu then you use a divider. Like I said, read up on the guide and its all in there.

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Hey I have tried to follow the guide as closely as possible but I cannot get any higher than 231X10 on the CPU by itself. I have tried to up the voltage in the CPU VID control and special control. I have tried using both VID's on auto. I have lowered the DRAM to 100 (1/02) and the LDT/FSB to 3.0 or 4.0. NOTHING!!! All I get is that the system won't boot into windows. It just gets me to the screen that says: Boot into safe mode or press DEL to enter the bios" Anything I have tried above the 231X10 gets me nowhere.

 

HELP HELP HELP!!!!!

 

I have not adjusted anything else in the DRAM config screen but the DRAM Mhz. Am I supposed to change settings in there from the auto settings that already appear at this time or what?????

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If you are still using that Aspire PSU, then it could be the limiting factor. If not, well you got a super dud cpu, but I highly doubt that. What are you using to to cool that cpu anyway, and what are your temps when attempting to OC on a certain vcore? Heat plays a huge role on you OC.

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Well I may have just had a breakthrough!! I changed the DRAM setting to auto(from the 1(02)) and now I am experimenting with 245 X 10. It finally booted up past the 231 X 10!!!

 

So now the RAM is running at the factory setting of 3-3-3-8. I am currently running SP2004 (1 instance on each core) to see how long it will stay stable. Is there a specified amount of time it should run before I should say the system is stable at that speed??? It has only been running about 15 mins. Also what temp should I be around during the test??? Currently I am about 45-50. My voltage is only at 1.328 (According to CPU Z) Also thanks for all of your help Voltes!!!!

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The true vcore iswhat you set it at bios, your temps are a bit high for that vcore. What are you using as a heatsink? Well for stability on an OC, I usually run it for at least 8+ hrs, but many would argue about that because even if they are stable in prime they have problems with actually playing games. Watch your temps as you increase your vcore, I can't stress that enough.

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Well the VCore temp came down to 38 during the middle of the test (which is the normal temp anyway) so that was a relief. Now I am trying to change the voltages and get it to boot at higher FSB setting but it is not working. So far changing the voltages from auto has not helped at all. I have tried 1.4-1.5 volts and it will not boot with any of those. The max voltage I can change it to is 1.55 so that would be my limit anyway. At least now I can get to 245X10 so that is an improvement.

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