FSB limiting Overclock

[gothpyre]

sorry here is screen of CPU-Z now with the ht lowerd. http://img17.imageshack.us/img17/1607/screen01no.jpg

Changing the ht still won't let it post past 253, even after going from x10.5 to x9(thanks for telling me how to change it on this board), will changing the ram allow it to post or what else should I change? Also my video card is an ati radeon 4650, I don't know if it makes a difference.

 

[Parad0x420]

I would try to increase CPU voltage to maybe around 1.4v, 1.42v, or up to 1.45v. I saw it mentioned in the first post that there's no problem with temps. But, what kind of temps are you seeing now and how are you testing them? If temps are still below 55*C, or even under 50*C, I would try a bump or two on the CPU voltage. If it still can't go any higher, you may have just found the top of the bus clock.

What's the rated speed for the RAM you're running? Is it PC-5300? Or PC-6400? If it's 6400, which is 800mhz you shouldn't have to lower anything on the RAM, as it looks like it's just a bit under 800mhz for now.

 

[Bobnova]

Yeah try turning the ram speed down, it's been OC'd 25% just like the rest of it.

 

[gothpyre]

Here is cpuz of the ram, i did not change the ram timing or voltage this is what it went to when I overclocked it(im told that when you overclock an amd everything gets overclocked at the same time). I would like to know what to change on the ram voltage and timing. I will try upping the vcore, I heard I should not go above 1.5v on a brisbane.

http://img199.imageshack.us/img199/6784/screen01p.jpg

Sorry I use core temp, idle 41c load 50c, though when my new cooler gets here temps wont be an issue.

 

[gothpyre]

I know that Im new here but I love this place. I have been reading about overclocking for like a year or two, but this is the first time I ever asked anyone on a board. Thanks so much for everyone helping me, I respect your opinions and I want to learn everything the people here have to teach me.

 

[Parad0x420]

Yes, you have that right about the CPU voltage, 1.5v is usually too much unless you have a great HSF. I wouldn't go any higher than 1.45, but that still give you a bit of room to play, try maybe 1.42 and see if that helps. If you're able to make that work and you like where the speed is at, try turning down the voltage 1 bump at a time till it's stable, this way you won't generate extra heat.

Everything looks fine on that tab, timings I would leave as they are, and if your RAM voltage is at 1.8v already you should be good. I have heard the occasional DDR2 stick that likes 2.1v but I don't think its those ones. If you still can't increase the bus, then try using the 266 divider on RAM. Good luck.

I know that Im new here but I love this place. I have been reading about overclocking for like a year or two, but this is the first time I ever asked anyone on a board. Thanks so much for everyone helping me, I respect your opinions and I want to learn everything the people here have to teach me.

Yea it is a great place to be. I was reading through this place for at least a year before I finally joined back in 07. Learned everything I know about OC'ing from these forums.

 

[Bobnova]

I doubt 333mhz ram is going to like much (if any) more then 376mhz.
I would turn it down a notch so it is still in it's happy place.

 

[gothpyre]

Parad0x420 and Bobnova thanks for posting so much info for me. I have read about ram dividers and thought I understood till I tried to do it. Do I change the timeing or what cause there is not a divider option in my bios(probably a stupid thing to say, Im sure its not a tab that says divider) but I can change all the timeing clocks. There is an option to change from 400 600 800 I forget what its called, but is that it?

 

[Bobnova]

That'd be it. You want the 533 option if there is one. You have 667mhz ram, and right now the divider is set so that with 200fsb you'll have 333mhz ram (ddr doubles that to 667). With 253fsb that divider puts it at 376, which is rather more then 333.
If you set it to 533 (266mhz) your ~25% OC will put it at 332mhz, just short of your normal speed.
As you have now proven 376mhz to work, that will allow the 533 setting to reach FSB 280 (a 40% OC).
If you set it to 400 (the next option down), you get up to fsb376.
Personally i think that 533 should be enough to find the limits of your CPU, a 40% oc is pretty massive for brisbanes.

 

[gothpyre]

I tried 400 and it would not boot the bios, I tried 533 but it won't post. Do I need to change anything else on the ram.

 

[Parad0x420]

You're welcome goth, and I believe if you follow what Bob said about the RAM, that should hopefully allow you to push a bit higher. And sorry about confusing you with 'divider', but yea where you were looking is the right spot to change it.

edit: Hmmm I'm not sure why that wouldn't work. What setting was the RAM set to originally? Was it the 667? Usually when lowering the RAM speed you can tighten up timings, but those timings should be fine for setting it lower.

 

[gothpyre]

600 or 667(cant remember) posted fine, but 400(had to reset cmos with pin) and 533 (won't post). It was set to auto, I'm guessing it was 6xx whaterer was what it was at since when I changed it, the speed was the same in cpuz on the ram. Did that make sense?

 

[Parad0x420]

Odd that slowing the memory down to it's rated speed like that would cause a no POST. One thing you could try is set the CPU back to around stock speeds, and try to set the memory to a lower speed from the start and see if that works. If so.. then start incrementally increasing the bus speed to begin OC'ing again.

On a side note, grats... your first star!

 

[gothpyre]

Thanks for the props for the star. Like I said I think stock was 667 so I think thats why it posted fine but I will try lowering the fsb(ht like you guys said its called) and knock the ram back to 533 to see if it post's.

 

[Parad0x420]

There is a method to finding the max RAM clocks and max CPU clocks by turning the other one down on the multipliers or divider, (setting it lower than rated) and then pushing the clocks higher. So that way, when you find the top end of each you're able to put it together and get the maximum performance for your OC. I know its a little back-tracking but hope that works and we can push that thing higher.

 

[gothpyre]

You were right, 533 posted but I had to lower the fsb to 230 to get it to post, any higher and it won't. What does that mean and what do I change next to get past the 253 fsb hurdle? My goal is 2.8 stable, I would love to get it to 3.0 but I don't think that's realistic with this mobo and ram.

latest cpuz http://img37.imageshack.us/img37/75/screen01qm.jpg

 

[gothpyre]

Parad0x420 your avatar is great.

 

[Bobnova]

Very strange. New plan: Set it to 667 and find the timings section, it will likely be CAS and then a bunch of other stuff, and be set at 5 5 5 15 (first is CAS, then others). Try setting them to 6 6 6 18, if that works then start raising the FSB again.
In a perfect world, that would buy the ram 133mhz, here in the real world it should at least buy 50mhz to 100mhz.

 

[gothpyre]

Thank you those setting helped me stabilize it at 253, so its progress. I still cant take it to 254 but now the bios don't freeze anymore, I can see the post telling me to reset cpu frequency. Before I changed the timing that you suggested it froze the bios when setting it to 254, and I had to manually clear the cmos every time. So what do you think I need to change to get it up a little more?

Here is my latest cpuz http://img6.imageshack.us/img6/8686/screen02we.jpg

 

[Bobnova]

See if you can find a setting for the ram that is listed as "Command rate", 1T or 2T.
Set that to 2T, if you can find it. It should be in there somewhere, at least i hope so.
That should buy more ram speed if it's still an issue.