Asus P5B Vanilla (non dlx!) vcore+dimm needed

Hi,

first off, this thread has been very interesting. I've been a modder/oc'er for several years, basically using PCs for 15 years and other computers since the early 80s. Just meaning to say I'm not your average annoying noob. ;)

Okay, here comes my problem: I purchased the P5B vanilla last week but I cannot get past FSB 400 or rather 405....My board came with BIOS 0211 and chipset revision C1, so it has probably been catching dust on the shelf for months.

system config:

ASUS P5B vanilla
Enermax Liberty 400W PSU, with independant 12V rails. 20A each, combined power max. 360W on both.
Core 2 Duo E6300 at 2800 MHz/1.4000V
BIOS 0806 currently
Gigabyte GF 7800GT/256 MB GPU
G.Skill F2-6400PHU2-1GBNR RAM (rated at 5-5-5-15)
Audigy 2 ZS soundcard
Intel PRO/1000MT GBit LAN card
SATA 1: Toshiba SD-M 1712 DVD ROM with SATA to IDE adapter.
SATA 2: LG DVD-R 4167 burner with SATA to IDE adapter
SATA 3: WDC 2500KS 250GB drive
SATA 4: WDC 1600JD 160GB drive

Here is what I have tested so far:
I've pushed the RAM to the limits at lower CPU clocks. As a result the RAM worked stable up to DDR950. Beyond that I noticed memory errors at the upper end of the 1 GB range during memtest86 test 5. Raising the voltage through the vmod to 2.4V or 2.25V did not change that. So I am back at stock voltage.

Current config: 2.0V, 5-5-5-15-6-35-12-12-12-12, FSB: 400, ratio 1:1

The default -15-5-10-10-10-10 causes errors in memtest.

The CPU: The system did not get to the BIOS screen beyond 405 MHz FSB. No matter if the multiplier was set to 6 or 7 (2400 or 2800 MHz). So I guess it isn't the CPU either that limits the OCing.

Mods: vdrop, 10k resistor. This gets the voltages to reflect the real setting int he BIOS. No more dropping, no more guessing.
vmch, 12k resistor. 1.433V on the chipset.

I used a 4 1/2 digit digital multimeter (app. 0.05% error margin at 2V DC)

1.) Any idea what's wrong? The E6300 should overclock beyond 3.2 GHz usually.

2.) What experiences do you folks have regarding using four 512 MB DIMMs? Does it degrade overclockability? I'd hate to drop to DDR2-667 FSB to RAM ratio...

3.) Did you ever notice in the ASUS PC Probe 2...in the DMI infos...there is a info field in the "Processor information (Type 4)": Max Speed: 3800 Mhz ?
What does this insinuate? Is this being read from the CPU itself, and Intel allows overclocking secretly?...

I just thought I should bring that up.

4.) SATA controller in AHCI mode (chipset, not JMicro controller). What sense does it make to have the device names in the BIOS and F8-bootmenu to be garbled? The letters look like you dropped some scrabble tiles on a table. (I can provide screenshots)

5) Drivers for the onboard HD audio. It appears that in Win2003 Server there is no Soundmax control panel/mixer being installed, despite being dedicated Win2003 installer files from the ASUS website. Any solutions? The installer package is more than 5 MB big, should be enough to contain one.

Any advice is welcome, however, the overclocking is my main concern.
Fire away. :)

Little article: Modding the P5B

http://www.wittekakker.be/projects/p5b/index.html

It's in dutch, anyway, you will understand what's on the pictures.

wittekakker: The only real difference that I can see between your system and mine is the Arctic Silver under the MCH and ICH's heatsinks. How much of a difference did that make overclocking wise in your case?

I might do that too in the next few days. Got AS5 here and a Thermaltake Sonictower as CPU cooler, and a small fan mounted on the NB because the sonictower's airstream goes horizontally. not vertically towards the board.

Anyway, a good summary on your page.

can someone please post pictures of how-to do the p5b vanilla vmch and vfsb mods please??!@ :confused:

Quote:

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Originally Posted by Amurtigress

wittekakker: The only real difference that I can see between your system and mine is the Arctic Silver under the MCH and ICH's heatsinks. How much of a difference did that make overclocking wise in your case?

I might do that too in the next few days. Got AS5 here and a Thermaltake Sonictower as CPU cooler, and a small fan mounted on the NB because the sonictower's airstream goes horizontally. not vertically towards the board.

Anyway, a good summary on your page.

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I don't know, I sold my memory, my new memory is allready back from where it came, goddamm RMA takes such a long time :( I just hate it to wait, and wait and wait...

Quote:

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Originally Posted by messerchmidt

can someone please post pictures of how-to do the p5b vanilla vmch and vfsb mods please??!@ :confused:

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can someone please do some reading... I posted pictures 2 posts above your post.

sorry missed that. this is vmch

Attachment 53582

which one is vfsb or is this the only other mod i need to do?

Quote:

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Originally Posted by wittekakker

Little article: Modding the P5B

http://www.wittekakker.be/projects/p5b/index.html

It's in dutch, anyway, you will understand what's on the pictures.

---

this website can translate it fairly well! :woot:

http://www.freetranslation.com/web.htm

Hello, First post here.

I got an Asus p5b and its stable @ 3.6ghz 450fsb. My ram is capable of 500fsb @ 2.3v so i guess ill need to do this mod. My question is can i just use a resistor to have a fixed voltage. Say i put the voltage to 1.8v or w/e the lowest voltage is and have a resistor that gives me +0.1v. From their id just up the voltage from 1.8v + 0.1 to 1.9v + 0.1v or have a diff resistor to give me a diff value.

If anyone could help that would be great.

This is all regarding the Memory voltage. Max i can pump is 2.1 and i need more but using some resistors rather then a trimmer pot.:slap:

echo...:slapass:

Just get a trimmer will ya.

well, if i knew some values then id be able to do it myself but...

10k trimmer pot fine? i got one which i need to test... It isnt the long blue ones but its a multy turn 10 k trimmer pot.

Watch my site, you can find the info their aswell. 50k VR is the best option.
It doesn't has to be multiturn, it's just more safe and more correct then one-turn VR's.

ok, modding in progress. How would i be able to read what voltages im pumping to my ram? :stick:

Dude, are you for real?
You lack any knowledge about Vmodding, just don't kill yourself today will ya.

see, soldering aint the problem...I can probably figure it out. But the fact that you just say that and don't give me the answer is just gay. Like what was the point of that post?

You think ur so high and mighty?

So if your gonna help anyone then do so but don't flame someone for 1 question that you probably though off when you started out.

Sorry it was a stupied question but i just like 2 double check things.

I've put effort in the stuff I've posted here, and also on the internet page I made espacially for all modders around here, but with questions like "how can I read voltage" you are at the wrong place. It's the very basic of Vmodding and shouldn't be questioned here. Plus, you were almost soldering it all up without knowing how to use it... like wtf.

Now consider yourself lucky, cause, you can read voltage like this:
take your voltmeter.
Turn it to 20VDC.
Connect to black wire to any ground. Your PSU molex connector has 2 ground wires (black also, who thought).
Connect the red wire to the VDIMM readpoint I show you on my site.
Now carfully watch the LCD, there might happen something.

Thanks, you could have said that in the first post.

ohh and btw i know how to use a dvm, all i needed was the point where i could check the voltage.

Found it on ur site.

Thanks

well, ive done the VDIMM mod @ 2.35v

to tell you the truth im still stuck @ 3.6ghz 450 fsb, 4-4-4-9 timing.

boots at 480fsb and can run pi, but stability wise its horrible.


Will the mod for the voltage drop and the vmch help it out?

seeing that i put in my bios 1.7volts and that under load it getting to 1.5volts..

Ok guys, thinking about the vdimm mod first.

If I set in BIOS 1.8V (Corsair XMS2 2x 1GB 800MHz, CL5, stuck at 3.2GHz with E6300) and place a 10k or a 20k resistor, how much voltage will I get?
Simple question guys, please answer.

Is it safe to keep ram at 2.3V 12hours a day?

Thank You for the answers.

mines rated @ 2.35v so id assume so :)

Just do the mod and boot to bios with the trimpot at max resistance then measure with dmm. Shouldn’t be hi at all if you start at max and move down from there. Its also a good idea to pre test the trimpot for how touchy it is with ohm meter.

2.3 should be ok for 24/7 ya

Very depending on what RAM you have, some can't take anything above 2.1V

Thanks guys for the answers :)

Ahh, I have a 10k,20k and a 50k resistor. Which one should I use?

This one says 10k:
http://img139.imageshack.us/img139/6966/vdimmp5bke9.jpg
This one says 20k:
http://img139.imageshack.us/img139/2...mmodyh4ab5.jpg


Edit: Ok, I read now the whole thread like 4 times :) I'll place a 20k resistor. So:
1. Turn off pc with 3.2GHz overclock, and before that the Vdimm set to 1,8v ?
2. Apply the mod, turn on the pc, check how much voltage I get with the mod.
3. If the mem after 1.8 BIOS -->2,1V real, I increase the BIOS voltage, right? Am I getting this?