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Increasing voltage of northbridge

post #1 of 16
Thread Starter 
Lets say I'm overclocking a P4 with an fsb of 533mhz, while my mobo supports 400mhz, 533mhz, and 800mhz.

Since my mobo supports up to 800mhz, says explicitly on the retail box, Does it make sense that I will not need to increase the voltage of the northbridge while overclocking my p4 with a 533mhz fsb until I can reach and surpass an fsb of 800mhz?

Or is it required to maintain a stable overclock that I increase voltage on the northbridge while increasing fsb? Taking into consideration I start with a 533mhz fsb.

Thanks, If I my question is sloppy, please ask me to clarify.
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post #2 of 16
Thread Starter 
Anyone?
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Da Gallardo
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post #3 of 16
If you increase a 533MHz fsb to 800MHz fsb and both fsb's are running standard (which they are in your stated case) then you should not have to increase voltages to anything but possibly your processor and likely not even then.

Both the motherboard and the processor have to be created with 800MHz fsb in mind for this to easily work.

In other words, a P4B Northwood will have a hard time making the 800MHz fsb in comparison to the P4A Prescott. With the P4B Northwood you would very likely have to incrementally raise the fsb, voltages to the CPU core and if you have the settings then raising the Northbridgw would also very likely have a positive effect on your overclock.

R
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post #4 of 16
Thread Starter 
Thanks Ropey, that's just the answer I was looking for.

Now I can forget about increasing voltage on the NB until I surpass 800mhz fsb, and that is 1 less limiting factor in my OC.
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post #5 of 16
Remember that this is not an incremental overclock. The increments between 533 and 800 might well fail when the move to 800 does not.

I have seen this happen many times. A 533MHz fsb processor does not make 180 X 4 = 720MHz but easily makes the 800MHz as the 720 is out of spec but the 800 is not.

R
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post #6 of 16
Thread Starter 
Quote:
Originally Posted by Ropey
Remember that this is not an incremental overclock. The increments between 533 and 800 might well fail when the move to 800 does not.

I have seen this happen many times. A 533MHz fsb processor does not make 180 X 4 = 720MHz but easily makes the 800MHz as the 720 is out of spec but the 800 is not.

R
Ok I will try increasing my fsb to 200 x 4 = 800mhz, but I very much doubt my current RAM will be able to handle 200mhz since they are only rated for 166mhz...maybe increasing vdimm from 2.8v to 2.9v will help and loosening timings from 2.5-3-3-6 to 3-4-4-8.
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post #7 of 16
Quote:
Originally Posted by ckp64
Ok I will try increasing my fsb to 200 x 4 = 800mhz, but I very much doubt my current RAM will be able to handle 200mhz since they are only rated for 166mhz...maybe increasing vdimm from 2.8v to 2.9v will help and loosening timings from 2.5-3-3-6 to 3-4-4-8.
If you loosen timmings.. try to lossen your cas to 3 first.. and see if that works.
post #8 of 16
Thread Starter 
No luck, I kept the timings same, loosened to 3-3-3-6, 3-3-3-8, and 3-4-4-8 but same result....
After setting fsb to 200mhz and rebooting, I hear 3 bios beeps. Since I have the AMI bios this means, "3 Beeps - Memory Read/Write Error in first 64KB block (check memory)"

Guess I'm going to have to upgrade RAM before I OC anymore.
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post #9 of 16
No ram divider on that motherboard? Can you set it at 333MHz? Look for an area that shows 266/333/400 and set it to 333. This will lock the memory at 333 and you will not get an incremental dram raise as you are not raising the fsb incrementally.

R
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by Ropey
No ram divider on that motherboard? Can you set it at 333MHz? Look for an area that shows 266/333/400 and set it to 333. This will lock the memory at 333 and you will not get an incremental dram raise as you are not raising the fsb incrementally.

R
My options are: ddr266, ddr333, ddr400, ddr500, and I think a couple between 400-500.

ddr266 is basically 1:1 of fsb:dram since the stock fsb on my CPU is 533mhz/4 = 133mhz

ddr333 is 4:5 => fsb:dram

ddr400 is 2:3 => fsb:dram

Anyways, so you're saying that if I increase my fsb directly to 200mhz and set ddr333 that my ram frequency will remain at 333mhz while my fsb is 200 x 4 = 800mhz?

I don't think my RAM frequency will lock like that, but no hurt in trying.

Edit: Didn't work, this is why.

When I set ddr266 (1:1) and put fsb to 200mhz my ram frequency will be 400mhz = 200x2. (1/1 = 200/200)

When I set ddr333 (4:5) and put fsb to 200mhz my ram frequency will be 500mhz = 250x2. (4/5 = 200/250)

Let's say I went as far as to set ddr400 (2:3), then ram is at 600mhz = 300x2 (2/3 = 200/300)

My current OC is with a divider of ddr266 with fsb at 188mhz, and my ram is running at 376mhz = 188x2.

If I want the least ram frequency I have to use a 1:1 or ddr266 divider, because the stock on my CPU is a fsb of 533mhz.

If I could somehow fool the mobo into thinking I have a CPU with a fsb of 800mhz stock, then I would be able to run dividers that actually let me run my ram at lower speeds. Is this possible?
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Da Gallardo
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