Possibly Overclocking an Unclockable 3820TG.

[Bronsky]

That is the clockgen that gives me a pll error no matter what I do.

Bronsky

[tgoode]

Clearly there are different chips being used in various models.

We should try to keep a record of which models like which clockgen until one or more of us get inside a system and identfy through observation what chip is being used.

In my 3820TG-3022 (Staples.ca) I am using the ICS9LPRS355BGLF clockgen in SetFSB

[tgoode]

OK, The best I have been able to do so far is 2689.9 MHz on the base clock. This is a 6.4% increase in base clock speed, which equates to a turbo speed of about 3.22GHZ

Here's my most recent run for score.





Is expecting more from this CPU unreasonable? I still have room left on the thermal side of things...

I am hoping that when I am able to supply a correct clockgen ID to abo, he will be able to make a SetFSB configuration that allows greater granularity in the settings.

Also, I have noticed that WPrime doesn't get the processor running in full-bore Turbo mode (note the intel gadget)

[Bronsky]

OK, The best I have been able to do so far is 2689.9 MHz on the base clock. This is a 6.4% increase in base clock speed, which equates to a turbo speed of about 3.22GHZ

Is expecting more from this CPU unreasonable? I still have room left on the thermal side of things...

I don't know yet. I'll let you know as soon as I install my I5-540M. Is yours an engineering sample or OEM. Hendrickson had an ES that did not OC very well at all. I bought an OEM to see if I can get a better OC. Your speeds are about the same as my I5-450M OC'd but we're not sure if that is due to the incredible OC'ability of the 450M or not. Hendrickson had a similar result with his ES I5-540M.

I have been busy at work, etc., but as soon as I get some time, hopefully in the next few days, I will swap in my new CPU. Since I already have a clokgen that I can max out, it should be a straightforward comparison between the two CPUs.

Did you increase the multiplier to get x21?

Bronsky

[tgoode]

I don't know yet. I'll let you know as soon as I install my I5-540M. Is yours an engineering sample or OEM. Hendrickson had an ES that did not OC very well at all. I bought an OEM to see if I can get a better OC. Your speeds are about the same as my I5-450M OC'd but we're not sure if that is due to the incredible OC'ability of the 450M or not. Hendrickson had a similar result with his ES I5-540M.


Did you increase the multiplier to get x21?

Bronsky

My 540M is an OEM unit.

I'm not sure if I changed the multiplier or not. The only changes made were to the byte codes at 00x00, 00x0f and 10x00 as shown in the screenshots earlier in this thread...

Much like you I would love to a manual that correlated the registers to the names of the variables being changed (multiplier, base clock, etc.)

[yuniu]

Have done a little bit of research. You can download a manual for this Clockgen here: 9LPRS365 (ICS) - Search -----> ICS9LPRS365 (9LPRS365.pdf) then scroll down and klick on locate datasheet. When you have the document opened search for Byte 0 FS Readback and read downwards.

It looks that byte 01 19 20 (PLL3) are required for some fine tuning, but further investigation needed. I played a little bit with it without concrete results. Could also be that i'm wrong with this idea.

[Bronsky]

This may be a really stupid question but ...

if I want to set a lower value for a registry value of BB, is the lower value BA? Is the next lower value AF? And so on?

Bronsky

[tgoode]

The BB A0 etc are hexidecimal bytes (8 bit words)

They go

A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
AA
AB
AC
AD
AE
AF
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
BA
BB
BC
BD
BE
BF

etc...

[Bronsky]

Thanks ... that was what I was doing wrong.

[Bronsky]

This is my most stable clockgen so far. It's a 26% increase from the base clocks. I don't think you're expecting too much. Hendrickson had a hard time with hiis 540M too but he has en ES, not an OEM. Maybe there is something wrong with the first gen of Arrandales and the Madison chips OC far better. Mine (540M OEM) is going in this weekend. I wanted to find a good base line to compare the two CPUs.

How come you can't feed in more clock speed by moving the slide bar to the right? See how yours are all the way over to the left and mine are all the way over to the right? Does your system freeze or something?

Bronsky