Overclocking With Ram Latency Settings

[Tempesta]

Hell again everyone -

 

I have the Asus P4C800-Deluxe mobo with the 1.0xx beta BIOS. I installed the beta BIOS per THG recommendation as that BIOS seems to have the best compatibility with my RAM. Corsair XMS PC3200LL.

 

I have the RAM set to 2,2,2,6,8 (I think). The system boots with the RAM this way every time and I don't have any stability problems. My BIOS supports that EZ-Overclocking utility, and I've been wanting to play with it finally. If I set any value of overclocking - even 5% - the system won't POST.

 

Before messing with anything else, I though I would ask here. Is it because I have my RAM latencies set low? If I set the RAM latencies to their defaults, which is something like 2,3,3,8,8, will the system then overclock? Anyone out there with a similar setup seen anything like this?

 

Thanks!

[FanATIc205]

probally . your pushing your ram as fast as it can be pushed as far as latencys are concerned. have you upped the default voltage of the ram ? try using a divider that keeps the ram @200mhz and thne go crazy on the fsb. try a 5:3 divider instead of 1:1 . your really not going to notic a big diff in mem bandwidth going from say cas2 -2-2-6 to cas 2 3-3-7 since intels pat technogoly helps out with bandwidth regardless of cas latency. the only thing you can do is mess around with it . i would set your ram to its stock latencys and then use a 1:1 divder . see how far you can oc go up like 3-5 mhz on the fsb at a time run prime95 for 10 mins or so if it doesnt fail go back and up it 5 more mhz . the first things you need to do is find out where your ram tops out at a certain latency, and then find out where your cpu and fsb tops oout, use a divider to set the ram speed low to find the cpu,fsb limit. then find a happy medium using dividers to keep the ram stable and a fsb to keep the system and cpu stable. id rather have a higher fsb with a low latencys using a divider so your ram will be out of sync. up the vdimm to at least 2.8 and dont go past 1.6 volts on your cpu dont use the automatic overclocking stuff set it your self in the bios. thats the fun part finding out how far you can push your system, having the mobo automaticlally do it takes the fun out of it

 

if you have the ll corsair i think its latencys are cas2 2-2-2-6 ?? might be wrong thou the regular 3200xms is cas2 3-3-7or6

Edited December 17, 2003 by FanATIc205

[Nuclear]

Here's what I would do, if you wanna OC to the max:

 

- Reset your factory latency for the time being

- Make sure your RAM is running at the specified volts, some RAM will require 2.7-2.8v, most boards start it at 2.6.

- Use your 5:4 divider first.

- Lock the AGP/PCI setting

- Leave your vcore alone

 

Slowly raise your FSB until it becomes unstable, you could hit as high as 3.2GHz w/o adjusting the vcore. Once the system becomes unstable, slowly, and I mean slowly raise your vcore. That 2.6 will run a default vcore of 1.525, go in steps of .25. Adjusting the vcore will allow you to run higher FSBs, but you will generate more heat, so you'll need a top notch cooling system.

 

You can adjust the vcore over 1.6, 1.75 is the max a P4 can take for extended periods of time. At 1.75 though, your really be making some heat, so be prepared. Take it slow and ask questions if you have them.

 

BTW: If you get to a point where the system won't even post, don't get worried. Either clear your CMOS jumper, or hold down the insert key while you power up. This will completely reset you and start you all over.

[DimensioN]

what do you mean with :

 

Use your 5:4 divider first.

 

:s ?

 

feeling noob

[FanATIc205]

basically use a divider that underclocks your ram that way you can find out your fsb and cpu limit.

[DimensioN]

.. ? why have i never heared of this before ? :s

 

lets see if i got that in my bios

[Nuclear]

You should have dividers in your bios. You should have a 1:1, 3:2, and 5:4. Most guys attain their high OCs with the 5:4 divider. For instance...I can reach 3.3GHz on a 1:1 divider, but I can reach 3.81 on a 5:4 divider and H2O.

[radact]

I've got the same problem, the BIOS on the P4P800 Deluxe doesn't seem to have a divider option. Can anyone else verify this or tell us all EXACTLY where it as how to set it?

 

I've got ADATA 512M DDR3500 modules and I can't get them past 160Mhz according CPU'z.

 

Help!

[DimensioN]

ok .. me is back at OC-mode ..

 

 

gonna tweak this crap above 3.3 .. must be possible

[Tempesta]

Sorry I haven't been around to read this, guys. I've been incredibly busy with my new job and the holidays.

 

Thanks so much for the suggestions! I'll be sure to give these things a try.

[ccokeman]

I've got the same problem, the BIOS on the P4P800 Deluxe doesn't seem to have a divider option. Can anyone else verify this or tell us all EXACTLY where it as how to set it?

 

I've got ADATA 512M DDR3500 modules and I can't get them past 160Mhz according CPU'z.

 

Help!

Just got the same mobo for my son and it lets you lock you memory at 3 different settings and auto 266,333 and 400 . Auto i guess would be 1:1 and locking it at a lower speed would be the other options. any thought?