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FSB:DRAM ratio...Overclocking...Utter OCnfusion - Please HELP

post #1 of 11
Thread Starter 
Hello all,

I AM IN UTTER CONFUSION

As from my last post"I have an AMD 64bit 3700+ San Diego. It has been overclocked from 2.2Ghz - 2.7Ghz. The HT Multiplier is at 4x and the multipier the same. I have just increased the fsb. The voltage is at stock. The idle temp is 33*c.

The problem I have is to do woith stability. When using prime 95 and doing a SMALL FFT TORTURE TEST and "memtest" together, they both work without any problems for over 10 hours - and more.

THE PROBLEM>>>Yet when I run just prime95 on small fft's without "memtest" an error comes up after 10 - 30 minutes. It says a fatal error, and Rounding Test 0.5, expected less than 0.4.

Is theer a reason why this only happens when i am not running memtest?

Does this mean the overclock is not stable - i have no problems using the PC at the moment?

Is tehre a way of solving this or is it first time builders and overclockers paranoia."

>>>>>I was trying to overclock my processor for the above reason. Supposedly, my FSBRAM ration used to be CPU/1 before.

When my PC was overclocked it was CPU/15.

I have now reverted all settings and it is at CPU/11.

What does th8is eman.

Is this bad

Why have I got it.

I would re\\lly appreciate someones help, and try to solve the problem.

I don't know what to do, or if I have damaged any parts.

Thanks
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post #2 of 11
Quote:
Originally Posted by sham

As from my last post"I have an AMD 64bit 3700+ San Diego. It has been overclocked from 2.2Ghz - 2.7Ghz. The HT Multiplier is at 4x and the multipier the same. I have just increased the fsb. The voltage is at stock. The idle temp is 33*c.
What do you have the CPU multiplier set to? If your HT multiplier is at 4x, and you just raised the FSB too high, you might've gone overboard on the HTT. I don't think it's supposed to go over 1040, or something like that.
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by amped
What do you have the CPU multiplier set to? If your HT multiplier is at 4x, and you just raised the FSB too high, you might've gone overboard on the HTT. I don't think it's supposed to go over 1040, or something like that.
The CPU multiplier was set upto 275 and the multiplier at 4*.

BUT NOW...the CPU multiplier is at 200Mhz, the HT Multiplier is at AUTO, and the Multiplier is at 11*. All standard features.

How do I get the ratio back to 1:1. Was it ever like that.

Have I done any permanent damage.

thanks
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post #4 of 11
Quote:
Originally Posted by sham
The CPU multiplier was set upto 275 and the multiplier at 4*.

BUT NOW...the CPU multiplier is at 200Mhz, the HT Multiplier is at AUTO, and the Multiplier is at 11*. All standard features.

How do I get the ratio back to 1:1. Was it ever like that.

Have I done any permanent damage.

thanks
I don't think you've done any permanent damage, your mobo's probably just confused out of its mind. You need to figure out what your FSB is (CPU base frequency and memory base frequency). After that, adjust your HT multiplier to keep the product under 1000. Then, ger rid of any RAM dividers, if it isn't stable bring down the FSB until your RAM works. Your CPU multiplier should be set to 22 I believe. I'm no expert so if I'm wrong some1 correct me. Also, make sure your PCI-e is locked (some1 fill him in on this, I don't have much experience here). When you get stable, be sure to keep track of temperatures. 55 celsius is an absolute limit under load. Anything above that has an exponential increase in risk of damage.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by SomeRandomGuy
I don't think you've done any permanent damage, your mobo's probably just confused out of its mind. You need to figure out what your FSB is (CPU base frequency and memory base frequency). After that, adjust your HT multiplier to keep the product under 1000. Then, ger rid of any RAM dividers, if it isn't stable bring down the FSB until your RAM works. Your CPU multiplier should be set to 22 I believe. I'm no expert so if I'm wrong some1 correct me. Also, make sure your PCI-e is locked (some1 fill him in on this, I don't have much experience here). When you get stable, be sure to keep track of temperatures. 55 celsius is an absolute limit under load. Anything above that has an exponential increase in risk of damage.
Thanks.

My Ht multipliuer is under Auto...through the bios.

I think on AMD processors the m,ultiplier onyl goes up top 11...but on Inrtel 22. My PCI-e is now locked...it was on 33.33Mhz before.


The rpoblem is that the FSBRAM ration is not 1:1.


I have being a bit for eading, you want to raise your FSB to a higher speed than your RAM supports, you have the option of running your RAM at a lower speed than your FSB.

So if my FSB is at 200, and my ram is at 201, should i not have 1:1.
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post #6 of 11
Your max multiplier will vary from each type of processor. A 4000+ will have one more multiplier option than the 3700+ (s939). This is why its rated at 200mhz faster (200mhz x 22 multi = 2.2Ghz, 200mhz x 23 multi = 2.4Ghz) I'm not sure EXACTLY how you get the 22 and 23, it might just be a straight number or it might be through some formula. A RAM divider cuts down the FSB, so you can run a 2:3 (or is it 3:2) divider and have CPU @ 300FSB and RAM @ 200FSB if ur RAM bites. You need to find your RAM divider and set it to 1:1 to bring the FSB's equal. Make sure to bring your FSB to a rated speed so it doesn't crash when you boot.
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post #7 of 11
I think the bottom line is that you should do a lot more research on your hardware before overclocking again. Learn what most people are getting with the same system as you, and learn about what each OC ability does to your system.

Also, get a reason to OC. It sounds stupid, and I know a lot of people OC just for fun, but if you have a goal in mind then you might be able to OC the components to reach your goal. I think that's the funnest part of OC'ing.

Still, you need to know what a memory divider does and why you need to keep your ram running as tight as possible (and what frequency you would need to run to get higher performance than tight memory timings). Also, understand the best way to go about overclocking you CPU. And what about that graphics card? Its always fun to OC graphics cards!

I don't know, but I just don't want you to fry your sweet system because your putting in values you don't completely understand, ya know? Good luck, though!
    
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by SomeRandomGuy
Your max multiplier will vary from each type of processor. A 4000+ will have one more multiplier option than the 3700+ (s939). This is why its rated at 200mhz faster (200mhz x 22 multi = 2.2Ghz, 200mhz x 23 multi = 2.4Ghz) I'm not sure EXACTLY how you get the 22 and 23, it might just be a straight number or it might be through some formula. A RAM divider cuts down the FSB, so you can run a 2:3 (or is it 3:2) divider and have CPU @ 300FSB and RAM @ 200FSB if ur RAM bites. You need to find your RAM divider and set it to 1:1 to bring the FSB's equal. Make sure to bring your FSB to a rated speed so it doesn't crash when you boot.
Thanks. Do you know where I can locate my RAM divider. i do not recall changing any divider settings.

the problem is that I am getting the FSBRAM ration to be - CPU/11.

It should be 1:1

Cos my fsb is 201 and so is the ram.

It says some frequency is running at 270 though.

Why is it CPU/11...is that even possible.

i have restored all details to standard on bios.

Could it be a glitch in CPUID...is there another program i can use to test this

thanks
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post #9 of 11
2700/11=245MHz.
I'm at a loss as to where you see a frequency of 270, if that was your HTT.

First off, you need to find your COU's and RAM's max speed, once you have that you will find OCing a bit more friendly. Those tasks are the time consuiming but necessary steps to a sucessful OC.

Have you read these guides...
A good how to find the max speeds of RAM nad CPU
http://www.overclock.net/faqs/31782-...limits-my.html
This MB guide is sumular to your version.
http://www.overclock.net/faqs/38169-...roduction.html
    
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post #10 of 11
if you want to go to a clock that high, you have to put your HT multiplyer to 3x

* ~ 200 = HT 5x
201 ~ 250= HT 4x
251 ~ 333= HT 3x

If you skip 1000Mhz in the HT you will get system instability, so if you had an overclock of 270Mhz with a 4x multiplyer = 270 x 4 = 1080Mhz and thats over 1000Mhz, try always keeping under 1000Mhz or 1000Mhz to max...
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