Dual IDA ... FTW

thread here:
http://forum.notebookreview.com/lenovo-ibm/566213-first-lenovo-t61-running-dial-ida-would-mine.html

 

Congrats

 

All good as long as you have a BIOS that can disable EIST.

 

Excuse my ignorance, but what is Dual IDA, and what is the big deal with it?

 

wonder as well.

 

A free overclock. Most CPU's are locked at their frequency. With EIST, if the CPU supports it, when one thread is running and the other is idle the one core can go up 0.5 on the multiplier above stock. So a 2.26 GHz core will run at 2.4 GHz on the one core. If you disable EIST then you can enable IDA on both cores so that the 2.26 GHz CPU runs on both cores at 2.4 GHz all the time............

 

The overclock gain is 5-13%. Depends on CPU and FSB.

For instance, on a T9300 (2.5ghz), you gain 2 extra multipliers; 13, 13.5.
FSB = 200mhz. 13.5multiplier x 200FSB =2.7Ghz. A 8% gain.

Or on a T9550(2.66ghz), you gain 1 extra multiplier; 10.5.
FSB=266Mhz. 10.5 x 266 = 2.8Ghz. A 5% gain.

 

Won't this produce more heat and make your laptop overall run warmer? I'm not even mention the loss of battery life when running on battery.

 

No, since there's no gain in power draw or increase in voltage. You're just using the CPU's available voltage. In fact, I have mine undervolted at max multiplier using ThrottleStop. See in the pic above where it says "VID?" You can use that to increase or decrease the voltage supplied to the CPU at that multiplier. Use Intel Burn Test to test if you have gone too low for stability.

And there wouldn't be any loss in battery life either in you set a battery profile in ThrottleStop to disengage the use of Dual IDA. With ThrottleStop, you can also set SLFM mode.

 

I see. I've asked this in ThrottleStop therad also, but I've have my CPU at 11x now. What I've wonder, is that the max my CPU can go up? Also, there isin't any way to incrase FSB in ThrottleStop, correct?

I'm currently stuck at 11.00 x 266.0 MHz = 2926.3 MHz

 

No there isn't a way to increase FSB in Throttlestop. To do that requires that the DV5's PLL be TME unlocked. Then you can use SetFSB or SetPLL to overclock the FSB. You could O/C the FSB to 300mhz. Then your T9600 would run @ 3.1Ghz (10.5 x 300) or 3.3Ghz([Dual IDA]11x300). It's possible that there's enough voltage available to do 333mhz on the FSB, stable. Then you're looking @ 3.66Ghz w/dual IDA.

In the owner's lounge I posted about the PLL. If you want to see a guide on how it is done, but on another computer: Click here.

 

Man, I don't know what to say. Thank you very very much! I've just tested my tempratures with Dual IDA, and max was 82C on core 1 80C on core 2 and 89C on chipset. Those are max!

However, I'll see if I can get it running at 3.1GHz.

Thank you again!!

 

I'm going to try it out on my DV5 in the future. No time left as I'll be away for a few months. Otherwise, I'd give you pointers specific to FSB overclocking the DV5.

 

my CPU is also undervolted while running Dual IDA, as its stock operating voltage is 1.137 Volts. I used ThrottleStop only to undervolt the CPU before, but since yesterday for performance gain as well

The CPU hits maximum temperature of 69 deg C, as shown on the tray icon. Disregard the ThrottleStop temp reading as it's incorrect due to a thermal sensing error that pops up on early T61 laptops that used Merom CPU but upgraded to Penryn later (i.e. my case). Long story, but if you follow the link to my CPU upgrade thread you'll see the case.

back on topic: The Dual IDA mode should be run only in Profile 1 in ThrottleStop (as per unclewebb suggestion). At my first test I made it in Profile 2 and so sometime it would go into Dual IDA and sometimes it will not, so I had to switch back and forth until it would activate. No more problems of that type though.

I'm not able to use SetFSB on my laptop so far.

 

What PLL chip is in your notebook?

 

I used it when I had a Q9000 installed in my notebook.

Took me from 2ghz to 2.266ghz, a 13.3% increase!

 

^ nice. I get 200MHz over, still worth it as I play Unreal Tournament 3 and hit 100% cpu usage often, which is causing drop in the framerate. Kind of makes you think that this is a GPU problem but with this game it's not :|

I'm not sure, didn't see the chip when I opened the laptop so it probably sits in a place that would make me disassemble the whole thing apart. But I tried all chips in setFSB with no success.

Also, I've never seen CPU overclocked T61 with changing the bus speed so far. I've seen one T60 as I remember, but Lenovo changed the chip so what worked for the T60 doesnt work for the T61.

 

Orthos is saying your CPU is running at 2593 MHz and it's set to Priority 1 which is the lowest. Try switching it to Priority 10, system may start to hang a bit but still accessible.

I have the same readings as yours and I have a P9600 @ 2.66 , 2.8 when using Dual IDA 10.5 multiplier in TS. It's weird I get diff. readings from diff. programs for CPU temperature and frequency.

Using priority 1 runs at 1.5 GHz but if I switch to Priority 10 it runs at 2.66 GHz. CPUZ says the CPU is at 2792 MHz. FSB says 1066 and Bus Speed 266. And I'm using Silent Mode which is supposed to keep the fan noise down, so many settings I get lost in fine tunning it.

 

May be I am the second one who was success on T61

link
Thanks a lots to miro_gt, middleton, and unclewebb for your efforts

 

nice

Use Profile 1 for Dual IDA though. Then in Options check "Start Dual IDA" and "Profile 1". What that does it cycles the EIST until the Dual IDA is set correctly, because if you put it in other profile than 1 then it may or may not enter Dual IDA from the first time when you switch to that profile. I talked to unclewebb about this and he said to use Profile 1 ... and that fixed all issues, it enters Dual IDA everytime I switch to Profile 1

 

there's this issue about running Penryn CPU on early model T61 (like mine) that used Merom CPU from the factory - it pops that thermal sensing error which middleton disabled in the modded BIOS. This is what is causing the reading from the CPU sensor to be incorrect.

Now my other program that controls the fan of the laptop gets its CPU temp reading from a sensor that sits very close to the CPU socket, so that is pretty close to the actual CPU temp. It shows the temp on the tray icon, i.e. 69 deg C in my case. So the core temps are ~70 deg C ... or so.

dont know why Orthos shows 2.6GHz. ThrottleStop has the most accurate frequency reading that you can find, as it's based on Intels own algorithm of calculating the actual CPU speed.

 

T61 PLL details

Does this download work from your locale? IBM Thinkpad T61 schematics . Drops out after downloading 50k @ 1kb/s on my end. It's hosted from Ho-Chi Minh in Vietnam.

If so, it will tell you the PLL your system is using. Quite likely The T61 PLL can be FSLx PLL pinmodded from 200->266Mhz (+33%). With your T9500, that would mean a 3.45-3.7Ghz(dual-IDA) overclock. The same link shows a T9300 is capable being overclocked to 3.6Ghz.

Something to consider it wanting to wring every last bit of performance potential out of your T61.

 

^ failed after [email protected]/s

 

Thank you, miro_gt, for hint about profile 1 in Throttle Stop.
If you need T61 schematics, PM your e-mail to me.

 

Moved Lenovo/IBM T61 FSLx PLL pinmod to http://forum.notebookreview.com/len...-cap-willing-pay-solution-53.html#post7323573 .