Overclocking past the fsb/multipliers

[chuwawa]

Ok, I must have read like 50 guides and all of them pretty much say the same thing.

I understand that the multiplier is often locked in many processors and whatnot. To me, I'd much rather raise the multiplier because raising fsb seems to effect other things such as RAM, hard drive and PCI/AGP slots. ( I understand that a change in fsb > change in multiplier)

Most of these guides don't adress the latter. How exactly is the RAM and the AGP slot affected? If I raise the fsb...the fsb of the video card gets raised too? So essentially I will need a better fan for the video card as well?

Bah..Need a summary or a guide that specifically adresses this!

Thank you.

 

[jkresh]

if you have a pci/agp lock on the board, then raising fsb has no effect on graphics or other cards in the system, without a lock then raising fsb also raises pc clock and agp clock, and most pci/agp cards dont handle that as well as processors. As for memory raising fsb raises memory speed becasue memory in general runs at a multiple of fsb, so if you want to raise fsb but dont have fast memory just change the ratio of cpu/mem. Ie if you have a p4 or a64 and ddr3200 and want to rasie fsb, set the mutliplier to 5/6 or mem speed to 166, and you will be able to raise fsb to 240 while keeping memory within spec (assuming your processor can go that high, which is unlikley without realy good cooling).

 

[AristoV300]

Yes you do not want to overclock your FSB unless you can lock your pci/agp to 66/33. If you can then you want to make sure you have memory that is rated above stock FSB so that you increase your FSB w/o memory limiting. Also it is good to have aftermarket HSF because you may need to increase your vcore. You should research your cpu to see what most users are getting out of thier overclocks to get a general idea of what you should be aiming for.

 

[xJUANGRAMx]

Originally posted by: AristoV300
Yes you do not want to overclock your FSB unless you can lock your pci/agp to 66/33.

And how would you know if you can lock the pci/agp? I have a gigabyte motherboard and when I run EasyTune, it says the agp is at 72 and the pci is at 36, however when I go into the bios, it shows the agp at 66 and pci at 33...which should I trust?

 

[chuwawa]

And how do you lock the PCI/AGP? I thought that this was locked by default on a mobo capable of it...

These are the sort of things that the guides should cover rather than having 5 paragraphs explaining that the CPU speed = multiplier x fsb, from every different angle!

 

[AristoV300]

EasyTune is a in Windows overclocking tool. I would not use that because you can not lock you AGP/PCI. Depends on your motherboard but there should be an option in the BIOS to lock it at 66/33. You want to overclock your cpu via the BIOS, not in Windows.

 

[xJUANGRAMx]

Right, I understand that. I just use it to check my temps, but my other question wasn't addressed, should i trust the bios or what easytune reports? Again, easytune says that the agp is at 72 and pci at 36...the bios says otherwise, 66 and 33...

 

[AristoV300]

What easytune reports it probably correct, so your board does not have a lock. Did you overclock via easytune? Do you have AMD or Intel?

 

[xJUANGRAMx]

I have an intel 3.0c, northwood i believe. My mb is a gigabyte g81k1100 or something like that, 875p chipset. I went to the bios, and it says agp, pci, src or such fixed...and no, i just run easytune so i can check out the temps. I will be getting new ram soon, cuz right now i just have corsair pc3200 value ram.