ASUS P5Q Memory Divider Settings? - Overclock.net

nachosanchezz · 04-20-09

I have a Asus P5Q motherboard, and I'm trying to oc my E6420. I only got a set of DDR2-800 memory, and I think I've hit a FBS hole at 400x8. I will have to oc my memory or set it on different dividers if I want to go beyond 400x8, but I can't manage to find any dividers (there isn't really a divider setting, just a list of memory frequecies available depending on what you set the FBS to) that set the memory frequency lower than the FBS. Is this how the P5Q BIOS is, or will a BIOS update solve my problem?

TDN1979 · 04-20-09

There is an option for this on that mobo (I have it as well) and I think it's on another page from the one that you are looking at. If I remember right, it's on the same page as the multi option. I know that you can change it on the page that you are on, but there is another one. I'm on this computer right now and i'm uploading files so I can not reboot to find it for you, otherwise I would. Hope this helps.

Quantum Reality · 04-20-09

That's what essentially sets the divider. Just drop it down by one if you want to run the memory at a lower speed and keep yanking up the FSB.

When I dropped from 240 to 200 MHz, my memory, stated to be DDR2-800 on that list, became DDR2-667. I just nudged it one slot back up to DDR2-800 and all was well.

nachosanchezz · 04-20-09

Quote:

Originally Posted by TDN1979

There is an option for this on that mobo (I have it as well) and I think it's on another page from the one that you are looking at. If I remember right, it's on the same page as the multi option. I know that you can change it on the page that you are on, but there is another one. I'm on this computer right now and i'm uploading files so I can not reboot to find it for you, otherwise I would. Hope this helps.

I don't think I have another page that has divider settings, I will check next time I reboot though.

Quote:

Originally Posted by Quantum Reality

That's what essentially sets the divider. Just drop it down by one if you want to run the memory at a lower speed and keep yanking up the FSB.

When I dropped from 240 to 200 MHz, my memory, stated to be DDR2-800 on that list, became DDR2-667. I just nudged it one slot back up to DDR2-800 and all was well.

The 1st option underneath "Auto", which is the lowest setting, is 1:1. I don't think I have any settings lower that that(in terms of memory freq).

ZealotKi11er · 04-20-09

So you want more then DDR2-800? The only option after that i think is DDR2-1000 4:5 which u set it 333Mhz i think.

ericeod · 04-20-09

Intel chipsets do not have FSB holes, that is exclusive to NVIDIA chipsets. You need to set the Transaction Booster to 10, then set the Chipset strap to auto and run the ram at the slowest speed (1:1). Then push the FSB and OC the CPU.

nachosanchezz · 04-20-09

Quote:

Originally Posted by ericeod

Intel chipsets do not have FSB holes, that is exclusive to NVIDIA chipsets. You need to set the Transaction Booster to 10, then set the Chipset strap to auto and run the ram at the slowest speed (1:1). Then push the FSB and OC the CPU.

Thanks, thats really helpful. So your saying if my CPU is capable of beyond 400x8, I should have no problems running it at that clock, it's just the matter of other settings?

ericeod · 04-20-09

Quote:

Originally Posted by nachosanchezz

Thanks, thats really helpful. So your saying if my CPU is capable of beyond 400x8, I should have no problems running it at that clock, it's just the matter of other settings?

Well, DDR2 800 ram can run a lsightly higher overclock. I've seen many of them reach DDR2 900. That would mean you could run a 450 FSB OC with the ram.

The lowest ram divider for the Intel chipset is 1:1, which means whatever you set the FSB to, the ram will run that MHz speed. The DDR2 rating is the actual MHz speed x 2. So 400FSB means the ram will run 400MHz x 2 = DDR2 800.

Just run CPU-Z and click on the memory tab. You will see the actual memory speed (not the DDR2 rating).

nachosanchezz · 04-20-09

Quote:

Originally Posted by ericeod

Well, DDR2 800 ram can run a lsightly higher overclock. I've seen many of them reach DDR2 900. That would mean you could run a 450 FSB OC with the ram.

The lowest ram divider for the Intel chipset is 1:1, which means whatever you set the FSB to, the ram will run that MHz speed. The DDR2 rating is the actual MHz speed x 2. So 400FSB means the ram will run 400MHz x 2 = DDR2 800.

Just run CPU-Z and click on the memory tab. You will see the actual memory speed (not the DDR2 rating).

Yes I think I understood all that. I just rebooted my computer and was going to set the Transaction Booster, but realised there are other settings under that too. What do I set the other settings? They are: Pull-In of CHA PH1, Pull-In of CHA PH2, Pull-In of CHB PH1, Pull-In of CHB PH2.

EDIT: Also, what do I set the CPU Margin Enhancement to? Does it matter?

ericeod · 04-20-09

Quote:

Originally Posted by nachosanchezz

Yes I think I understood all that. I just rebooted my computer and was going to set the Transaction Booster, but realised there are other settings under that too. What do I set the other settings? They are: Pull-In of CHA PH1, Pull-In of CHA PH2, Pull-In of CHB PH1, Pull-In of CHB PH2.

EDIT: Also, what do I set the CPU Margin Enhancement to? Does it matter?

Leave all the Pull-ins alone. They just set 1 lower performance level to each channel. So if you set the common level to 8, then enabled all pull-ins, the actual level would be 7. I've never had to use it, and it really only comes into play when yopu are compensating for skewing at really high frequencies (or maybe with mixed ram).

I dont mess with the CPU Margin Enhancement at all. I havent seen anyone post anything significant about it.

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ASUS P5Q Memory Divider Settings?

04-20-09	#2 (permalink)
TDN1979 Case Modder Join Date: Dec 2008 Posts: 1,209 Rep: 148 Unique Rep: 129 Hardware Reviews: 2 Trader Rating: 7	There is an option for this on that mobo (I have it as well) and I think it's on another page from the one that you are looking at. If I remember right, it's on the same page as the multi option. I know that you can change it on the page that you are on, but there is another one. I'm on this computer right now and i'm uploading files so I can not reboot to find it for you, otherwise I would. Hope this helps.

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