P5b-vm overclocking

B

Bandi

n00b
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Oct 28, 2006
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I would like to know how to overclock my computer: motherboard asus p5b-vm, cpu conroe 6400, ddr2 533 ram. My problem is that I am not able to go over 285 cpu frequency, the computer does not even start if I try a higher value. Thanks for helping me.
 
It's your RAM... running at 285mhz will push it to about 570mhz, 40mhz over spec. Most RAM can handle this, but I need to know:

The type of RAM
The Manufacturer
The timings it's running at
The timings it's rated at
the voltage required
the voltage it's running at.


Some of these you can get from your BIOS, others from the website of the product you bought.

If you dont wanna find all that, try increasing the timings to 4-4-4-12, and give your RAM about .1v over what it's rated at (either 1.8v or 2.1v, depending on your model, it will most likely be 1.8v).
 
Arcygenical said:
It's your RAM... running at 285mhz will push it to about 570mhz, 40mhz over spec. Most RAM can handle this, but I need to know:

The type of RAM
The Manufacturer
The timings it's running at
The timings it's rated at
the voltage required
the voltage it's running at.


Some of these you can get from your BIOS, others from the website of the product you bought.

If you dont wanna find all that, try increasing the timings to 4-4-4-12, and give your RAM about .1v over what it's rated at (either 1.8v or 2.1v, depending on your model, it will most likely be 1.8v).
Click to expand...
QFT

I had the same problem on a friend's Dell XPS 700.
 
Although, the more I read, the more I see that the p5B-vm board is *not* a very good overclocker...

Push the PCIe freq up to 110 (dont hold me liable if things explode) and push the fsb up. There are accounts of people reaching 320FSB with 120PCIe, and about 315 with 110PCIe.
 
Thanks for fast reply. My ram is a kingston value ram 533 non-ecc 4200 CL4 240. It's running on default values. By the way I was able, thank to you, to reach the 290 cpu frequency pushing the PCIe freq up to 110. Thanks. Is it really dangerous to use this PCI frequency? Thanks
 
As long as you don't have any stability problems then you should be able to leave it at 110, however don't go any higher since past that point there is a high chance of problems.

Since your RAM is rated for a pretty slow speed, you'll need to apply a divider to it if you want to reach a higher CPU speed. If your motherboard is capable of it, try changing the RAM divider to something below the bus speed, like 5:4 or 4:3.
 
Alas Zero, I dont think there are other dividers. I know you can set the base RAM frequency for 533mhz, but that's about it.
 
Arcygenical said:
Alas Zero, I dont think there are other dividers. I know you can set the base RAM frequency for 533mhz, but that's about it.
Click to expand...
Yeah, I've heard the P5B series doesn't have lower dividers. Too bad :(.
 
Which ram can you suggest me to buy to reach the best possible performance with my motherboard and processor? Thanks
 
Some DDR2-667 will let you get your FSB up to a guarenteed 333FSB.

333FSB is probably the limit of your board anyways.
 
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