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Confused 3500+ OC beginner

post #1 of 11
Thread Starter 
Hi, nice forums you got here

I've been reading up on over clocking my cpu for over a week now and I keep coming to the same problems I cant seem to find answers for, I was hoping you guys might be able to help me out.

Basically, I understand that when I increase my "CPU Overclock in MHz" from 200, it will effect the speed of my ram and AGP/PCI slots, which is bad. There is an option in my bios, under "DRAM Configuration" called "Max Mem Clock (MHz)" with the options Auto,100,133,166,200. When I set this to 200 and then restart the system I can see, in the POST and CPU-Z, that my cpu overclock (205MHz for testing) is increasing my ram speed. I thought this option would Lock the memory clock from going above 200?

This also has me concerned that my PCI/AGP bus is being overclocked too. There is an option under the "Power Bios Features" called "AGP OverClock in MHz" with options from 66 to 100, At the moment it is set to default 66. I have read in some overclocking guides that it should be set to 67MHz to engage the lock, is this true or do I just leave it a 66?

Finally, is there a utility that can show me in windows what my actual PCI/AGP clock speed is? I want to make sure that it is not increasing with the CPU clock before I start serious overclocking. I have Sisoft Sandra but it does not seem to have that reading anywhere.

Any help you could give to an OC beginner would be very appreciated

Thanks
Sean
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post #2 of 11
I would leave your agp/pci speeds alone, lock them, in fact. Clockgen will show your pci/agp speeds. Also, you have ddr400 which runs @200mhz, so set it to 166,then you have 34mhz of room to OC.
post #3 of 11
Before you go to far in your overclocking I would highly recommend that you read this:

http://www.overclock.net/amd-general...ing-guide.html.

You need to find out what each part of your system is capable of on it's own before you try to push the whole system. It is good information and understanding it will make you overclocking experience much more enjoyable.
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by dubz View Post
I would leave your agp/pci speeds alone, lock them, in fact. Clockgen will show your pci/agp speeds. Also, you have ddr400 which runs @200mhz, so set it to 166,then you have 34mhz of room to OC.
Ahh, so the "max mem clock" isnt a "lock" as such, more a speed selector.

ClockGen is great, just what I was looking for thanks

And Ill have a good look through that guide Lancer33

cheers guys

ill be back if I need more help
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post #5 of 11
Thread Starter 
So, after a bit more reading, I went about overclocking. I reduced my Mem to 166mhz and reduced my HT multiplier to x4 (is was x5 by Auto). I managed to get up to 230mhz cpu clock before things started to go pear shaped. At 235mhz windows booted fine but the pc just hung with a black screen during 3DMark. At 240 the pc would reboot its self or halt during loading windows.

So I am on 230mhz at the moment, fully stable with
Core @ 2540mhz
FSB @ 230 (x11)
Mem @ 181mhz
HT link @923mhz

When I went to 235 and 240 FSB I tried lowering my ram to 133mhz and my HT Multiplier to x3 but that made no difference.

One thing that I found strange was my temps. Before OC my cpu was at 32C idle and about 40c under load. Now its about 34C idle and 46 under load. I expected a much greater increase in heat.

Now I'm wondering what else can I change to allow me overclock further? From the temps I think I should be able to push more, but there is some thing else limiting me, what might it be?

Cheers

Sean
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post #6 of 11
you could bump the CPU volts up again just a bit..you want to keep load temps under 50-55C
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post #7 of 11
yeah i would increase Vcore. if it doesnt work thats alright, looks like a decent OC anyway.
    
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post #8 of 11
Well, bump the vcore. What about vdimm?

No stock voltages.

Find each max. Take a piece of paper and put together, kinda like a puzzle, your optimum OC... and OC your GPU too!!

When finding max mem clock, use memtest off a Linux ISO. Burn it to a CDR using ImgBurn.

Use ORTHOS Blend testing to test overall stability. Also, your memory limit speeds are only different dividers. It just sets it to run at a ratio of speed compared to the FSB. DDR400 on your board give a 1:1 but if the RAM can't take the high clocks, go on a divider.

If your RAM is getting OC'ed, loosen the timings. I can't urge you enough to check out the OC'ing FAQ's here. Believe me, just read them. you learn a lot...
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post #9 of 11
you might have hit the chip limit - is it a Venice? My old Venice 3500+ maxed at around 2.55ghz as well, anything over and it wouldn't boot no matter what - the fact that you have 4 sticks of RAM doesnt help either, AMD's memory controllers go to hell with 4 sticks
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Imperator Nick View Post
you might have hit the chip limit - is it a Venice? My old Venice 3500+ maxed at around 2.55ghz as well, anything over and it wouldn't boot no matter what - the fact that you have 4 sticks of RAM doesnt help either, AMD's memory controllers go to hell with 4 sticks
Yeah its a Venice, can you remember what sort of temps yours was at when OC'ed?

Im a bit nervous about upping the voltage. I don't know why, I guess maybe I just feel that I am maybe into an area where I can bork the CPU totally, or is it safe enough?
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