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Northy 2.4b (133) -> 2.695Ghz (150)

post #1 of 7
Thread Starter 
I had read the "Intel Overclocking Guide" by NoAffinity

Just sth to remind what I should be care of in OC, can't say I'm a newbie, but I'm not that experienced either. My first OC was a Celeron 300A to 450... old days...

some info -
cpu: Intel 2.4b
mb: Gigabyte (sis 661 chipset) - microATX
ram: Cosair DDR400 1GB (value-ram) and Kingston DDR400 512MB

I want to OC as much as i can with stock fan and no change on core voltage, cause i'm using a mid-VAIO case and the air flow isn't good at all. I could go as far to 153Mhz (2.75Ghz) and the ram has to run at 408Mhz, the bios doesn't give me the choice to set the ram speed exactly. From Everest, I know the ratio is 4:3 (ram speed : fsb), so the ram is actually running at 203.9Mhz (just the way of listing as told in NoAffinity's guide). Anyway, the benchmarks on ram and cpu were fine. But then I thought I should use memtest just to be sure, and thanks for it, the ram is very stable at 408Mhz as there were many errors!! LUCKY!! I suspect it's the cosair which caused the errors, is it because it is valued!??

So I changed the fsb to 150Mhz, so I could run the ram at 400Mhz, and then everything was fine. From Everest again (cpuz couldn't read the mem info), I knew the ram setting was 3-4-4-9, WTH!! So I went to bios and changed them to 3-3-3-8 which was show in Everest as the compatible ram setting. It also tells me that the Kingston could have better setting in lower Mhz, but it only tells me the 400Mhz setting for Cosair. However, Everest said the ram was set to 3-3-3-7, don't know why!!

From NoAffinity's guide, he said that the best is to run in 1:1 speed. So I was thinking may be I run both at 150Mhz, and I can set the ram to run in better setting (eg. 2.5-3-2-8). But i'm not so sure if that possible with the Cosair because of its 1GB structure!!

If 1:1 is the best setting, I can't understand why some ppl would even oc their ram!!
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post #2 of 7
Quote:
Anyway, the benchmarks on ram and cpu were fine. But then I thought I should use memtest just to be sure, and thanks for it, the ram is very stable at 408Mhz as there were many errors!! LUCKY!! I suspect it's the cosair which caused the errors, is it because it is valued!??
Most likely your value ram is the cause for the errors. Also small form factors tend to run hot so that could play a part in this. Try swithing your ram chipps out running one at a time to see if one module is having the errors and the other isn't. If that is the case consider a upgrade of that module.

Quote:
So I changed the fsb to 150Mhz, so I could run the ram at 400Mhz, and then everything was fine. From Everest again (cpuz couldn't read the mem info), I knew the ram setting was 3-4-4-9, WTH!! So I went to bios and changed them to 3-3-3-8 which was show in Everest as the compatible ram setting. It also tells me that the Kingston could have better setting in lower Mhz, but it only tells me the 400Mhz setting for Cosair. However, Everest said the ram was set to 3-3-3-7, don't know why!!
Dont always trust eversest. Trust your bios. Also you do know that the higher the number with timings the slower it is. To start out run your ram with the slowest timings possible 3-4-4-8 is usually what i start at. Then overclock as high as you can keeping things stable. If you want to find out your CPUs max run a devider of 1:2 and push untill your CPU starts having errors. When you reach that number record your FSB mhz. Then you know what speed memory you want to buy in the future. Once you have that ram you can run 1:1.
Quote:
From NoAffinity's guide, he said that the best is to run in 1:1 speed. So I was thinking may be I run both at 150Mhz, and I can set the ram to run in better setting (eg. 2.5-3-2-8). But i'm not so sure if that possible with the Cosair because of its 1GB structure!!
I dont quite understand what you are trying to say here. Your ram modules will always run at the same speed. In everest it may be showing you what your rams default settings are and not the actual settings. Once you find out your CPUs max speed then you should try to lower your timings.


Quote:
If 1:1 is the best setting, I can't understand why some ppl would even oc their ram!!
Well I dont quite understand this either. when you overclock your CPU you also overclock your RAM. So that is why people overclock their ram. Sometimes your ram cant keep up with the CPU {lots of errors in memtest} So they run a divider to allow for the greater overclock. when you find out what your CPUs stable at you should consider a ram upgrade so that you can run in 1:1 because it will give you the best performance.

I hope this helps.
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post #3 of 7
Thread Starter 
thx SpookedJunglist,

i just wanted to know if 150mhz fsb is the max, should i change the ram to run at 300mhz in bios to achieve the 1:1 setting. Also with the ram running at 300mhz, may be i can set them to 2.5-3-2-8 or something better.

Please recommend some softwares that can list detail info on RAM.

don't think i'll do anymore upgrade on this pc, it's kinda old... would love to get a new system with AMD64 dual...
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post #4 of 7
In regards to your RAM divider question/statement, I have a 2.4b at around 2.75 GHz. The performance at 4:5 (with PC2700 RAM) is significantly better than at 1:1. I initially used a 1:1 divider when overclocking but was rather disappointed to see the folding frame times increasing despite the increased CPU speed. Restoring the default 4:5 divider made a world of difference. So although 1:1 is theoretically the best, sometimes a divider that favors RAM is a good thing.
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post #5 of 7
Thread Starter 
thx Taeric

I just tried the 1:1 setting with ram @ 300Mhz (2.5-3-3-8), the bechmark shows that its much slower than ram @ 400Mhz (3-3-3-8). I believe the benchmark did test the system as a whole, so, is 1:1 is the way to go?

Can anyone give some test results to solid this 1:1 theory!?
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post #6 of 7
Quote:
Originally Posted by Taeric
The performance at 4:5 (with PC2700 RAM) is significantly better than at 1:1. I initially used a 1:1 divider when overclocking but was rather disappointed to see the folding frame times increasing despite the increased CPU speed. Restoring the default 4:5 divider made a world of difference. So although 1:1 is theoretically the best, sometimes a divider that favors RAM is a good thing.
One has to take into account the very likely prospect of dram errors and Windows ECC correction on the read-->write-->verify [find error] repeat process --> [find error] repeat process --> find error --> Flush cache and resend to drive for data --> repeat process etc. This can be a time consuming (for a computer) process and will slow the system down considerably.

If you do not error out in Memtest86 v3.2 then these errors would not occur though as Memtest86 disables all ECC algorithms.

http://www.memtest86.com/

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post #7 of 7
Thread Starter 
My ram run fine at 400MHz (3-3-3-8) and at 300MHz (2.5-3-3-8).

Tested it with memtest86 3.0, no problem at all...

But they got many errors at 408MHz (3-4-4-9)!!
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