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post #21 of 34
Quote:
Originally Posted by Theminatar View Post
How can I get my comp stable @3.8ghz? I have my volts at 1.5v for my cpu, it idles at 29c. my NB freq at 2400mhz and my cpu freq at 204. But it isn't stable, I can get my system to start up but as soon as I run prime95 or AMD overload it crashes and blue screens.

Once again, I'm new to overclocking. I have it stable @3.4ghz, I ran AMD Overdrive for 6 hours and it didn't crash or slow down.

Here's my CPU-Z on 3.7ghz
No prob to help you get there but noted you have a thing or two mixed up related to terminology based on your post. I understand you are new to this and I'm trying to clarify things here to help you out if I can.

There is no way your NB could be running at 2400MHz, that's your HT speed, and the CPU freq you stated being 204 would be your NB/bus speed. Refer to the screenie of my 939 Socket Opteron 175 with the CPU-Z reading in this post as an example of this. You'll note my HT speed is 1180MHz and my bus speed is at 295MHz.


Also know your temps at idle will not be the same as they will be under load, meaning when you have the CPU performing work such as doing a run in Super PI or the Wprime bench.
Temps will spike in a hurry once the CPU begins doing work and if temps get too high, you know stability goes out the window.
One more thing to think about is the more cores you have going the more heat that's being generated - Normally chips with their cores unlocked will run hotter with the same voltage used than those with these extra cores turned off.

Phenom II CPU's are temp sensitive anyway and 1.5v's with the cooling you have for it is simply too much voltage to expect stability at higher clocks with the cooling you currently have.
You'll see better results with a lower voltage used simply because less heat is generated with a lower voltage used for what you are trying to do. To get an idea of what voltages can be ran for the speeds you want, you can take a peek at this thread if you haven't already:
http://www.overclock.net/amd-cpus/47...00-series.html

Note what I did with my 720BE was indeed well over 1.5v's but my setup is on watercooling and I had some really good ambient temps going. My 720BE can and has gone over 4.0 with as little as 1.44v's before and is perfectly stable doing 4.0 with about 1.47v's used, no prob but my chip (unfortunately) doesn't unlock.

Edited by Kryton - 1/9/11 at 1:43am
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post #22 of 34
Thread Starter 
Ok, thanks for clarifying all that for me, I'll take a picture of my BIOS settings that way you cans ee wha tI'm talking about. Because it says NB FSU or something, then it says 2400mhz.

When you told me about how bad it was for my mobo to be running 1.5v I reduced the voltage to 1.45v intead. It still runs stable at that as well.

So could you explain to me how increasing my North Bridge helps increase my CPU multiplier?
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post #23 of 34
Quote:
Originally Posted by Theminatar View Post
Ok, thanks for clarifying all that for me, I'll take a picture of my BIOS settings that way you cans ee wha tI'm talking about. Because it says NB FSU or something, then it says 2400mhz.

When you told me about how bad it was for my mobo to be running 1.5v I reduced the voltage to 1.45v intead. It still runs stable at that as well.

So could you explain to me how increasing my North Bridge helps increase my CPU multiplier?
I am officially still watching this to see if you blow your motherboard
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post #24 of 34
Quote:
Originally Posted by Theminatar View Post
Ok, thanks for clarifying all that for me, I'll take a picture of my BIOS settings that way you cans ee wha tI'm talking about. Because it says NB FSU or something, then it says 2400mhz.

When you told me about how bad it was for my mobo to be running 1.5v I reduced the voltage to 1.45v intead. It still runs stable at that as well.

So could you explain to me how increasing my North Bridge helps increase my CPU multiplier?
Increasing your NB speed doesn't affect your CPU multiplier but does affect your CPU speed.

Your CPU multi is an adjustment done in the BIOS to the CPU itself to determine what ratio it runs in relation to the FSB/NB speed and that will = what speed in MHz you'll get.

As an example, my system in the screenie was running an 11x multi with a FSB speed of 295. When you do the math, 11 x 295 = 3245MHz as shown in the CPU speed portion of the CPU-Z reading.
If you step down the CPU multi to let's say, 9x but leave the FSB setting alone, then you'd have 9 x 295 = 2655MHz as my CPU speed.
This is the basic part of determining where your CPU speed will be when doing adjustments.

Your HT speed is also affected whenever you change the FSB setting but not affected by the CPU multi used.

I can say your HT speed of 2400MHz is too high and lowering that down will help to stabilize the system, letting you go higher in CPU speed with stability. With my AM3 system I normally keep mine at or below the 2000MHz mark to be sure I'm not pushing it too hard. I normally use the 3x HT multi for everything and it works out fine that way for me for most anything I do.

As for what is what in the BIOS itself, you can identify your settings by what appears when going into your adjustments.

CPU multi adjustments will normally appear with selections ranging from 4x all the way up to 24x for BE chips. For non-BE chips, whatever it's max multi is will be the highest one you can choose but it will definitely have a higher max setting than 7x.

HT multi selections will normally range from 1x up to about 6x, some can be 7x as a max you'll see, depending on the board you'd have.

FSB/NB speed selections will never be settings of 10x, 11x, ect, rather you'll see things start off at 200MHz and go up from there in 1MHz increments.

RAM dividers play a part too with selections typically ranging from 200MHz to 100MHz with several selections in between (Typically speeds of 166,150,133,100MHz) and these are used to keep your RAM within a specified speed range. The higher the FSB speeds goes, the more important these become. These can also be expressed directly as a ratio too that you'd see.

RAM dividers are easy to understand.

Using basic DDR RAM as a reference, if using a 200MHz / 1:1 ratio, that means your RAM is running at the same speed as the bus and it will go up by the same amount as the bus does when you raise it's speed. RAM however will eventually top out and start throwing errors, so that's when you use a divider to slow it down to maintain stability.

If using a 166MHz divider as an example, then your bus will run at 200MHz and the RAM will run at 166MHz, this ratio remains consistent as bus speeds are raised, meaning your RAM will always run 34MHz slower than the bus speed unless you once again change your divider. If you raise the bus up to 234MHz, then your RAM would be at 200MHz.

If you change the divider to a 133MHz divider, then your RAM will start off at 133MHz while the bus will be at 200MHz. The same consistency in the difference in speed applies and in this case, your RAM will always run 67MHz slower than the bus speed, no matter where you set the bus speed itself. you'd need to set the bus up to 267 to get your RAM up to 200MHz with a 133MHz divider.

It's like gears in your vehicle, once the speeds get too high, you'd naturally shift gears to slow down the engine (RAM) as the vehicle's speed continues to rise.
Edited by Kryton - 1/10/11 at 9:49pm
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post #25 of 34
Thread Starter 
Wow, seems like there's mre involved in OCing than I realized. But it's fun nonetheless.

Here's my BIOS settings, I took pictures of my settings and my CPU.






I hope this helps a little bit more. When I get home I'll try and increase my FSB and lower my clockage to see if it runs more stable.

My HT is set on auto, not 2400mhz. My NB was set on 2400mhz. In the pictures you'll see that it's set on 2000mhz.

My RAM's tmings are 7-7-7-21 @~680mhz
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post #26 of 34
Thread Starter 
What if I kept my CPU at stock voltages of 1.4v and upped the FSB and lowered the multiplier a bit, could I still achieve my 3.4ghz? That way I don't run the risk of frying the board.

I'll try that when I get home and post my results tomorrow.
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post #27 of 34
You probrably could.

I'd try that and see what happens. If it crashes or something, you can always revert back to default/stock settings if needed.
AMD's as a historical trend like some bus speed thrown in to help out but the Phenom II's are more multi capable than previous chips meaning they are not as bus dependent for speed as older AMD chips are.
I also noted the BIOS screenies you posted and have to say different board manufacturers "Label" their settings differently than others do, causing a bit of confusion at times.
What I stated above applies regardless of what the option is named - If the selection has settings starting out at 200MHz and goes up by 1Mhz increments, that's your FSB/NB speed settings.

You can explore the BIOS by taking a "Peek" at what's there where it says Auto to see what settings it contains but be sure if not wanting to change anything, just set it back to Auto once done looking.

I don't know why the BIOS says the NB is at 2000MHz (I'm not familiar with a Biostar board or BIOS) but again, it's how things are labeled by the board's manufacturer you'd need to figure out so when doing an adjustment, you'll know what you are changing and how it will affect the system. If not really sure, just ask. There's more than one owner of the board you have around and they should be able to clear things up.
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post #28 of 34
Thread Starter 
Ok, so I went home and I was messing with some settings and trying to use the FSB more. I set the FSB to 230mhz and my multiplier to x15 which gives me 3450mhz, but when I hit f10 to save the settings and restart the system. The BIOS will freeze and I have to restart it. Then it changes my FBS back to 200 and keeps the multiplier at x15. But when I put my FSB to 227mhz and multiplier to x15 it will save it then go to the Windows 7 boot logo and will blue screen. Why does one blue screen but the other just freeze and set the FSB to default? Does it have to do with the amount of power it needs?

I also noticed when put my NB FID to 2200mhz my boot screen will give me an eror saying to many cold resets have taken place because the system could be incorrectly overclocked. So I think I'm just going to keep my NB FID on default at 2000mhz.

But I'd like help using my FSB along with the multiplier.
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post #29 of 34
Quote:
Originally Posted by Theminatar View Post
Ok, so I went home and I was messing with some settings and trying to use the FSB more. I set the FSB to 230mhz and my multiplier to x15 which gives me 3450mhz, but when I hit f10 to save the settings and restart the system. The BIOS will freeze and I have to restart it. Then it changes my FBS back to 200 and keeps the multiplier at x15. But when I put my FSB to 227mhz and multiplier to x15 it will save it then go to the Windows 7 boot logo and will blue screen. Why does one blue screen but the other just freeze and set the FSB to default? Does it have to do with the amount of power it needs?

I also noticed when put my NB FID to 2200mhz my boot screen will give me an eror saying to many cold resets have taken place because the system could be incorrectly overclocked. So I think I'm just going to keep my NB FID on default at 2000mhz.

But I'd like help using my FSB along with the multiplier.
When the board detects a very unstable OC, crash recovery takes over and resets the system to defaults so you can at least boot again or make changes - That's what you have going on with the 230MHz setting. When it actually boots and freezes/ BSOD's upon Windows startup, the system normally needs more voltage to get a successful boot in to the OS.

It's at that point you can "Bump" up the voltage to the CPU and NB, particularly the NB at this point. One more thing, bear in mind as I explained earlier as bus speeds climb, you may have to start using a RAM divider. Normally a small bump in voltage where you are now will suffice but you'll eventually reach a point where you will have to use a divider - More voltage won't solve the problem when that happens. Just try it with a bump in voltage to the NB and RAM, then try it at 227MHz to see what happens. Don't get crazy, just inch the voltage up until you get a successful boot into the OS.
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post #30 of 34
Quote:
Originally Posted by Kryton View Post
It's at that point you can "Bump" up the voltage to the CPU and NB, particularly the NB at this point.
In myBIOS I have

CPU/NB voltage

setting, and a

NB 1.8V

setting

do people change the [NB 1.8V] setting too?
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