unlocking the rest of the FSB

[Kronickhigh]

Hopefully I'm posting this in the right category... sorry if this isn't

I'm not sure what the deal is here, but I've got a P4 2.6 GHz with the 800 MHz fsb cpu, and the fsb is only clocked at 533.

I'm not exactly sure how to get it up to 800. Was wondering if anyone could give me some pointers, I'm not trying to OC it.

system specs are as follows:
Intel P4 2.6 GHz
Coolermaster Hyper 48
ABIT IC7-G mobo
Pair 512 MB ddr 400, setup on dual channel

[Tyrinon]

I'd say double check your BIOS settings to make sure they are correct. What is telling you that the cpu is running at 533fsb (CPU-Z, boot screen)?

I have an old IC7 w/ a 2.8e or 3.0e (don't remember which, and I am not at home to check...) installed and I thought the mobo would auto detect the CPU... If needed, I can check a few settings on it when I get home and advise if needed (unless someone beats me to it, of course :) )

[hUMANbEATbOX]

if you are only getting 533mhz on the fsb (or 133fsb to be more precise), then the boot strap is set to 533. this needs to be set to 800 in the bios. i'm not sure what the exact setting is called, as i don't have my IC7-max3 & 2.4c up and running atm.

if i understand you correctly, the cpu speed is at 1729mhz right now (13*133). once you set it to the 800 strap, it will be the correct speed (13*200).

[Kronickhigh]

well... it is showing it at the full 2.6 GHz. I did set the bootstrap to 800 last night... and I've been using this lil program called cpuid to see what the fsb is clocked at. Even though I set the bootstrap to the 800 it still shows 533.

btw the cpu says 133 x 20.

am I being ignorant here?

[d]g[ts]

well... it is showing it at the full 2.6 GHz. I did set the bootstrap to 800 last night... and I've been using this lil program called cpuid to see what the fsb is clocked at. Even though I set the bootstrap to the 800 it still shows 533.

btw the cpu says 133 x 20.

am I being ignorant here?
If your CPU comes with a multiplier of 20, then its default FSB speed is 533 Mhz. this should also be shown n the heatspreader of the chip in its ID code.
I believe what you have is a 2.66 Ghz CPU and not meant to run at 800mhz fsb.

[hUMANbEATbOX]

well... it is showing it at the full 2.6 GHz. I did set the bootstrap to 800 last night... and I've been using this lil program called cpuid to see what the fsb is clocked at. Even though I set the bootstrap to the 800 it still shows 533.

btw the cpu says 133 x 20.

am I being ignorant here?

what does CPUZ say? if it has a multi of 20, then it is a 533mhz part, and not 800mhz part. 20*133 = 2.66ghz, 20*200 = 4ghz.

what makes you think it should have a 800mhz fsb? if it was a 2.6ghz cpu with a 800mhz fsb, it would be a Northwood 2.6c, with 512kb of cache and HyperThreading. if not, it is a 2.66ghz prescott that has 1mb of cache, and NO HT.

if its a northwood, i would say 3.25ghz would be about average. for some reason, the 2.6c never really clocked like the 2.4c, 2.8c and 3.0c. if it is a prescott, then it should be able to do 4ghz, provided you can keep it cool, and have a decent powersupply.

[Kronickhigh]

well... I'd like to thank you guys for clarifying that for me... a friend of mine had this system as spare parts and just gave them to me... this is the newest system I've been able to get my hands inside of. Still not a bad upgrade considering I was coming from an amd athlon xp 2400+ with 256 MB of pc 2100 on an HP motherboard

BTW I was told that this cpu had an 800 MHz fsb

[hUMANbEATbOX]

hey no problems..

that's a pretty decent cpu, considering it was free. because it starts with a lower fsb, it makes it easier to oc. by setting it to 200fsb manually, you would get 4ghz. mind you, your powersuplly needs to be decent, along with your cooling, like i said. at 4ghz, it would be SUPER fast compared to your athlon.

what motherboard, psu, and cooling will you be using?

[Kronickhigh]

the psu is MGE 400 Watt, the rest of the system is listed above... I forgot to mention I was also given an ATI all-in-wonder 9600... seems to me the cpu runs alittle hot... I'll have to check and see what the actual temps are

[hUMANbEATbOX]

oh yeah, sorry i forgot you listed the specs.

those cpus do run hot..that cooler should be decent tho. i'd say you should be able to do at LEAST 3.6ghz.

[Kronickhigh]

well... I just ran doom 3 for ten minutes... and the hottest it got was 52... sittin here typing on the web it's runnin 42... this is according to MBM 5

[Kronickhigh]

quick update... I went in throught the soft menu and uped the fsb from 133 to 150 catching it up to 3 GHz... ran doom 3 again and managed to get it up to 64 degrees... most of the time it was runnin bout 60

[hUMANbEATbOX]

yeah, that's starting to get a bit warm. if you wanna take it any higher, you are gonna have to totally rethink your cooling. make sure the case is well ventillated. you might even consider adding a duct for the cpu. batboy used to have a good article in his sig about prescott cooling, but he took it out long ago. maybe if he sees this he can post a link.

[Kronickhigh]

actually I believe it's the northwood cpu... I don't know a whole bunch about this stuff... the last pc I OC'd was a slot 1 p3 650.... got it to go good at 845

[jtjuska]

It could be a P4 2.66B which would be a northwood on the 533 bus. I think that a CPUz screen shot would answer a lot of questions though.

~jtjuska

[Kronickhigh]

does this help?

http://www.myspacephoto.com/files/10052/cpuz.JPG

[hUMANbEATbOX]

yep, that settles it. it is a northwood, like jtjuska said. forgot about those, its been a while. ;)

so, i'd say 3ghz is a nice OC. you may be able to squeeze another 200mhz outta it, but you still have to keep the temps down. with a northwood, i'd say its safe to go up to 1.625-1.65v. just make sure to NEVER let it go over 1.7v, or you risk S.N.D.S or sudden northwood death syndrome.

[Kronickhigh]

yep, that settles it. it is a northwood, like jtjuska said. forgot about those, its been a while. ;)

so, i'd say 3ghz is a nice OC. you may be able to squeeze another 200mhz outta it, but you still have to keep the temps down. with a northwood, i'd say its safe to go up to 1.625-1.65v. just make sure to NEVER let it go over 1.7v, or you risk S.N.D.S or sudden northwood death syndrome.

I think I'm good at the 3GHz... this machine seems to serve most of my purposes at the moment... I was just under the wrong impression apperently

[jtjuska]

3GHz is a great OC on those, and you should have some pretty decent performance. The only crappy thing about the 2.66B is that it didn't have Hyperthreading, only the 3.06B did. Oh well, as long as you are happy with it thats what counts. Also HBB is dead on with what is safe with the Northwood P4s

~jtjuska