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Dumb Asus P5LD2 question

post #1 of 9
Thread Starter 
Hello,

I'm still too unfimiliar with this Board, I can't seem to get the BIOS to set CPU:RAM Operation to be 1:1. Right now CPU-z indicates that FSB_DRAM ratio is 3:5 and i have overclocked FSB to 215.5 Mhz. The CPU is Cedar Mill 631

Please tell me how I can setup BIOS to have it run 1:1 or is the current setting better? Also can you explain to me what I should do with PCI Express Frequency settings in "ADVANCE" section in this bios. I can set to to 90-150 , Voltages is not specified just the Frequency value.

thank you in advance
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post #2 of 9
You don't want a 1:1 ratio with ddr2 ram. It runs at a faster bus speed than ddr ram. Set the cpu clock and mem clock options to manual then set the frequencies to the speeds you want. Running a 1:1 ratio with ddr2 ram is slowing it down unless you have a really high fsb. On my asus mb's the cpu/ram freq. settings are under the Advanced/jumperfree section and the ram timings are under the chipset setting in advanced.
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post #3 of 9
Thread Starter 
To Busa,

Thanks , I see what you are saying. I had DDR 1 ram before on my ASUS P4p800 board, I've since started using DDR-2 RAM. In the BIOS at Advance tab , Jumperfree settings, I can only up the FSB and it seems the bios automatically sets RAM speed. If FSB is selected 220 I get 700 somewhat DRAM, and If I go above 220 FSB the DRAM has a much lower setting. I need to go all the way to about 300 FSB in order to reattain the actual RAM PC5300 (667mhz) speed of the DDR2 RAM I installed. Why do you think this is ???
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post #4 of 9
You may not get upto 300fsb with a 945P. From what I understand the P5LD2-Deluxe maxes out @ 270.

As far as RAM goes, you could run the fsb with a 3:4 or a 2:3 ratio, that way you don't max out your RAM and have room for more OCing. Just give them the 2.1v-to-2.3v whichever is stable.

I don't know how the P5LD2 works in changing the RAMs fsb in the BIOS but in my MoBo I can change it right under where I change the CPUs fsb. So it'd be the 2nd line.
post #5 of 9
Thread Starter 
Uh Huh , I can take it to 450 in the bios. So why would that be?

The thing that bugs me is that when you look at FSB and put it to manual and when you up your FSB value's the BIOS automatically configures the DRAM speed. Like I said , 220 FSB gives me 700 Mhz of DRAM , but when I go over 220 , e.g. 225 , the DRAM speed goes down to like 500 Mhz. Also the CPURAM ratio of automatically changed when FSB settings are changed , and I can't seem to do anything about it.
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post #6 of 9
Quote:
The thing that bugs me is that when you look at FSB and put it to manual and when you up your FSB value's the BIOS automatically configures the DRAM speed.
I belive your problem relies right there, you shouldn't set it to AUTO, I did have that same thing happening using the AIBooter's NOS feature and it was not good to run the CPU's fsb higher than the RAM.

Anyhow, you should manually set the RAM's frequency, you have that option, I guess?
Just like I do, and with every other ASUS board?


When I set the CPU frequency to 225fsb, the DRAM frequency will automatically start to change and that's when you can choose a 2:3 or 3:4 ratio.

For example, when I set my CPU Freq. to 245fsb
The RAM Freq. will start to change (go up and down in value) till I see the 980mhz and that's when I stop and have a 1:2 ratio. So you can/could do the same and that way your DRAM Freq. wouldn't be lower than the CPU's.
post #7 of 9
Quote:
Originally Posted by honsbeek
Uh Huh , I can take it to 450 in the bios. So why would that be?

The thing that bugs me is that when you look at FSB and put it to manual and when you up your FSB value's the BIOS automatically configures the DRAM speed. Like I said , 220 FSB gives me 700 Mhz of DRAM , but when I go over 220 , e.g. 225 , the DRAM speed goes down to like 500 Mhz. Also the CPURAM ratio of automatically changed when FSB settings are changed , and I can't seem to do anything about it.
Something in the ram config is still set to auto. The mb is reseting the ram to match the fsb frequency and keep the ram running at rated speeds. Look for something like "set ram freq by speed" or something. All settings MUST be on manual to lock a divider in otherwise it will float.
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by busa
Something in the ram config is still set to auto. The mb is reseting the ram to match the fsb frequency and keep the ram running at rated speeds. Look for something like "set ram freq by speed" or something. All settings MUST be on manual to lock a divider in otherwise it will float.
You're right, I can manually change the Dram speeds.
So 1:1 timing is NOT a good thing with DDR-2 rams, however
on my older Asus p4p800se DDR 1 Ram board I could get this ratio,
That's why I wondered about it

How far do you reckon I can push this Pen 631 , 4.0 Ghz , with full-load.
What would be termination Temps. PC probe has a threshold of 60 Celsius
I used to run my Prescott 3.0 Ghz at that temp without even overclocking it too much (#_*)

Please advise
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post #9 of 9
Thread Starter 
BUSA :

please explain why you say "You don't want 1:1 with DDR2 Ram" Why is this logical to you, being an expert. Isn't DDR2 Newer and better than DDR1 rams?
Or does that have nothing to do with it ?

I currently am running FSB at 240.5 FSB and have FSBRAM at 3:4 with Dram frequency running at 320.6Mhz. So that would been 641.2 somthing in BIOS that I have specified. I could set it to 800 but what do you think is the best combination... I'm really stuck at this at this stage
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OCZ Vector 128mb / 1.5TB Barracuda Noctua Windows 7 Ultimate x64 Eizo Flexscan SX2762W 
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My System
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CPUMotherboardGraphicsRAM
Intel Core i5 2500K ASUS P8P67 (B3) Sapphire Radeon HD5830 G.SKILL DDR3 4G PC3-12800 CL7 RIPJAWS RM 2GBx2ea 
Hard DriveCoolingOSMonitor
OCZ Vector 128mb / 1.5TB Barracuda Noctua Windows 7 Ultimate x64 Eizo Flexscan SX2762W 
MonitorKeyboardPowerCase
Eizo Foris FS2332  Topre Realforce 87u Heroichi HEC-COUGAR CM 700 80PLUS Bronze Coolermaster CM690 II Advanced 
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