OCing Asus P5LD2 and DDR2

[scoobysix]

On my old rig

*Asus P4P800-E Deluxe, P4 3.2, some generic DDR400 (2.5-3-3-8), Thermaltake 480w PSU

I was able to overclock to 3.6 pretty easily by raising the FSB and raising RAM/AGP/Vcore voltages to suit.

On my current rig

*Asus P5LD2 Deluxe, P4 3.4, Corsair XMS2 DDR2-675 (4-4-4-12), Antec Truepower 2.0 480w PSU

I've been trying to hit a target 3.8 overclock by raising the FSB and letting RAM run at 667mhz on SPD latency. All voltages are still set on Auto. On this setting, I can't even get into POST and have to reset CMOS to continue.

So I just used the BIOS' overclock profile of 10% to achieve 3.75 but I noticed that in POST, RAM is only running at PC3200 (ie. 400mhz).

Any suggestions or advice in how I can achieve a 3.8 OC and still force RAM to run at @675mhz?

CPU is watercooled so no worries about heat. Case is also extremely well-ventilated (Thermaltake Armor).

 

[BitByBit]

Can't you raise the memory voltage?

 

[Capt Caveman]

You need to oc manually. Manually set FSB, DRAM timings, DRAM voltage, cpu voltage.

 

[imported_Kensai]

Originally posted by: Capt Caveman
You need to oc manually. Manually set FSB, DRAM timings, DRAM voltage, cpu voltage.

 

[scoobysix]

I'm a bit apprehensive about altering those voltages as I don't know what's the default voltage set at? Is there any program I can use to check?