Never owned a 2.66 ghz chip (except a Celeron 2.0 @ 2.66, which I would run at 3.0 in a decent mobo), but I have a 2.4 Northy that will easily run 3.4 Ghz, and could almost hit 3.6 (and is now running at 2.4 in a Dell)
Listen: get a new mobo with agp/pci locks, or learn how to pin mod. Most aftermaket mobos that support 800 fsb also unofficially support 666 fsb. If your mobo supports 800 fsb, then pin mod the stupid cpu to the 666 fsb, which will net you 3.33 GHz. If its a prescott and you want to fail, you could try the 800 fsb and see if it will run at 4 GHz, which I obviously seriously doubt.
I just saw the volts, missed the SNDS on the end. Thought I would give a friendly reminder.
It is scarey to mess with the voltage. Just don't want to be on it after a month or so, and get a BSOD, reboot, and then nothing... heh
I guess I don't understand the memory timings all the much. I understand the lower the timings are the better, but more stressful.
And the other thing that confuses me, is no matter what I set the timings, cpu-z reads them as default, even though I changed it.
I had it set to 2-2-2-6. When I rechecked it with cpu-z, it says it set at 2.5-3-3-7. I'm guessing it defaults to reg values if the FSB is pushed, since its an Asus board. Ratio changes though. 1:1 now. But if I go back to default speeds (2.66ghz), ratio is 4:5.
But I guess I should be happy enough for what it is set at for now.
LOL - Well, I only add some voltage to get stable OC. Not to blow it up. But the thought of getting it to 3.33 would be something, though I don't think it would last long, if the vcore was at 1.8+.
Anyhoo, funny how an odd P4 frequecy of 2.66 can't do an even 3.0 ghz - stable. It can run that way with the vcore at 1.675 or even set to auto. Prime95 just finds it not stable.
Just got done with Prime95 @ 2.960ghz / 2-2-2-5:
I usually just run it for 6 hours, but it passed 7 hours 17 mins.
Again, 40mhz difference, for 3ghz, and it couldn't run Prime95 for over 2 hours.
I just wondered how many people with a P4 2.66/533 would have it running at or above 3ghz stable, and could share tips. Though, if they had it above 3ghz, hard to say if the CPU is still.. alive. :shock:
It is A-Data DDR400. I relaxed the timing to 2.5-3-3-8 (which will cause performance to go down, and is far as it can go relaxed wise). Still no go. I think it just an odd CPU wanting to stay at an odd figure as far as getting it to go as fast as it can, stable wise.
40mhz difference isn't going to make up for anymore performance increase. As far as getting it over 3ghz, I don't want it to have to face death at 1.8+v.
I'm better off waiting on a nother P4 northwood, especally if the mulitplier is unlocked. Mine is locked at 20. The 3ghz800FSB I saw might be unlocked, or locked at 15. That still would get me 3.4ghz at the most if locked.
I think I have it on auto. Though I did mess with that setting, and tried to for 66.66/33.33 and it wouldn't post, when trying to get the onboard sound to work, when clocked to run 3.10ghz. The speeds are so out of wack that it doesn't help to put it on a fix speed.
As far as FSB, it supports 266/400FSB or uses PC2700(DDR266) or PC3200(DDR400) memory. I'm not sure if that is where you get 333 at, unless that was the 'unofficially support 666 FSB' that joe was referring to.
Ya with the quad, it gets confusing. The fastest it supports is 3.2. But OC, it may take it a step further.
Well, that is pretty much my idea that I have for now. Hard to find the 3.2 extreme, which would be the most expensive of the line of northy cores, though I don't want to buy it from ebay.
The other thing of experiencing the 800FSB speed, which my RAM isn't doing.. hehe. That is my extreme-non-existing budget for a last upgrade for this machine, with another 1 gig stick of the same A-Data ram.
I did see some a good deals like I mentioned earlier:
2.8-800FSB for $111 US
3.0-800FSB for $154 US
Just wonder how long they will be in stock, or if the price will go down. While waiting, the other idea was to see if anyone was getting the most of what they can from this particular frequency speed of 2.66.
I also wonder if the one I saw (2.8-3.0), have the mulitplier unlocked. I'm guessing that they are.