P4C800 VDimm Droop in memtest

[WolfF]

Hi!

I got my OCZ DDR Booster, to feed my BH-5, obtaining:

_____________________________Memtest_____
2.0-2-2-5 | 3.05v | 230Mhz | #5 = OK | #6 = OK
2.0-2-2-5 | 3.15v | 235Mhz | #5 = OK | #6 = OK
2.0-2-2-7 | 3.15v | 238Mhz | #5 = OK | #6 = OK
2.0-2-3-7 | 3.15v | 240Mhz | #5 = OK | #6 = OK

all Burst Lenght = 8
Motherboard: P4C800 Deluxe 1016
Chipset = PAT enabled, Turbo, Infinite, 15.6u

I thought that I could put more voltage, to reach 240 2.0-2-2, however 3.3V, 3.4V, 3.5 VDimm doesn't help. #5 give me a lots of errors.

I notice a VDimm Droop (-1V) when the test #5 is running.

My PSU have 3.3V rail 3.345 solid (tested prime95 read directly with Voltmeter). Increase 3.3V to 3.45 doesn't help with the droop, VAGP either.



what do you think?

Somebody has notice this VDimm Droop at memtest #5?

Is :
2.0-2-3-7 | 3.15v | 240Mhz | #5 = OK | #6 = OK
My BH5 top limit?

I'm a little desapointed...

please, Help me with your knowledge and experience

(invoking eva2000, saaya, or any other guru )

[Hell-Fire]

Sounds like a psu issue to me...or a specific Vdimm issue with your boards regulation.

What brand psu is it??

You have to keep the 3.3v rail atleast .25v higher than your Vdimm setting, and I actually recommend 0.3v more.

[WolfF]

Hi Hell-Fire.

My PSU is a PC Power & Cooling TurboCool 510 Deluxe. Goyo, another XS member, modified the 3.3VRail to reach 3.6V. Actually, he told me that you showed to him, how to do it.

In addition, I've noticed that the VDimm goes up(0.15V) and down(-0.15V), fluctuates a lot.

Then, if I want to set to 3.4V VDimm, I need 3.3V Rail = 3.6V ?

Thanks... I'll check it.

[Hell-Fire]

Hi Hell-Fire.

My PSU is a PC Power & Cooling TurboCool 510 Deluxe. Goyo, another XS member, modified the 3.3VRail to reach 3.6V. Actually, he told me that you showed to him, how to do it.

In addition, I've noticed that the VDimm goes up(0.15V) and down(-0.15V), fluctuates a lot.

Then, if I want to set to 3.4V VDimm, I need 3.3V Rail = 3.6V ?

Thanks... I'll check it.

Yes, I recommend pushing the 3.3v rail to 3.65v in fact.