Which T43 OR T43p CPU is the coolest? (No Heat issues)

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djThinkbad · #1 Post by **djThinkbad** » Tue Jan 29, 2008 9:43 am

I have a t43p laptop which has a bad CPU chip (2.26ghz), now I was getting ready to replace it with the exact same 2.26 ghz cpu, when I got an idea.
Correct me if I am wrong but the heat problem with the t43p's is mainly due to the CPU installed. My machine with the current 2.26 cpu went to dangerous heat levels (90* C on average when just scanning using norton or macfee or adaware... or playing any game)

QUESTION:
So I needed to know what (t43 or t43p) cpu chip would be the best to buy (COOL) and replace the current bad 2.26 ghz chip?

CZOLG · #2 Post by **CZOLG** » Tue Jan 29, 2008 9:53 am

I read somewhere in this forum regarding T43 that anything above 1.8 Ghz gets very hot.
Then again, you need to ask yourself how often do you use 100% CPU?
I believe all Pentium M's intalled in T43 series idle at the same 800 Mhz anyway, so no benefit there.

jimmy274 · #3 Post by **jimmy274** » Tue Jan 29, 2008 10:34 am

That would probably help, but as far as I've heard the main problem with dissipation is not due to the CPU, but ATi FireGL V3200. Don't go too low with the frequency, as you might only speed down the system, while leaving the temperatures high...

CZOLG · #4 Post by **CZOLG** » Tue Jan 29, 2008 12:40 pm

I can confirm that actually. I monitor temperatures most of the time on my T43p and after undervolting the CPU it does not reach more than 70 degrees at 2.13GHZ and 100% load.
The GPU however hovers at 58-65 while not doing any 3d at all.

ajkula66 · #5 Post by **ajkula66** » Tue Jan 29, 2008 1:31 pm

Yep, FireGL 3200 is your main culprit...

As for CPUs, my favourite is 1.8 but to each his own...

ulrich.von.lich · #6 Post by **ulrich.von.lich** » Tue Jan 29, 2008 1:42 pm

The PM760 2.0Ghz seems to be a good choice regarding speed/dollar. However I think the heat problem in T43p is mainly caused by the FireGL chip. A T43p with the 2.13Ghz CPU can run about 10C - 15C hotter than a T43 with the same CPU.

Changing the power plan would also help reducing the heat. Right now I'm running IE, winamp, outlook and some programs in the background using "ThinkPad default" power plan and the highest temperature reported by TPFanControl is 56C (GPU), the CPU runs at 51C. With "Maximum Performance" power plan, the system would run at about 67 - 72C for doing the same things. The highest temperature I've ever seen is 86C.

Hope it helps. Btw, how could a CPU go bad?

djThinkbad · #7 Post by **djThinkbad** » Wed Jan 30, 2008 3:00 pm

THANKS TO ALL who replied

So by lowering the voltage of the CPU the temperature can be controlled? How low can you go using NHC on a 2.26 GHZ CPU?

ulrich.von.lich · #8 Post by **ulrich.von.lich** » Wed Jan 30, 2008 3:48 pm

800Mhz I think, the same frequency as all 400MT/s Dothans could go. However I don't use NHC. The ThinkVantage Power Manager software will do the job. Just set the CPU speed to adaptive or low.

As other forum members have stated, the main culprit is the FireGL 3200. Maybe you should first try to underclock the GPU using PowerPlay

djThinkbad · #9 Post by **djThinkbad** » Wed Jan 30, 2008 4:13 pm

ulrich.von.lich wrote:800Mhz I think, the same frequency as all 400MT/s Dothans could go. However I don't use NHC. The ThinkVantage Power Manager software will do the job. Just set the CPU speed to adaptive or low.

As other forum members have stated, the main culprit is the FireGL 3200. Maybe you should first try to underclock the GPU using PowerPlay

Thanks ulrich.von.lich... I'll try that

Brad · #10 Post by **Brad** » Wed Jan 30, 2008 5:13 pm

I have not seen this CPU fail. I have several running. They have not reached 90C but I thought that they will work until 100C.

Is your CPU under warranty?

Brad

#11 Post by **richk** » Wed Jan 30, 2008 5:19 pm

I think they are rated to run at 100C. How did it fail? I've never seen that.

djThinkbad · #12 Post by **djThinkbad** » Wed Jan 30, 2008 8:02 pm

Brad wrote:I have not seen this CPU fail. I have several running. They have not reached 90C but I thought that they will work until 100C.

Is your CPU under warranty?

Brad

Yes and they will replace it 4 free!
One of the PC doctor tests failed and so they said it is the CPU Chip

CZOLG · #13 Post by **CZOLG** » Thu Jan 31, 2008 6:08 am

djThinkbad wrote: So by lowering the voltage of the CPU the temperature can be controlled? How low can you go using NHC on a 2.26 GHZ CPU?

I cannot remember the exact Figure right know, but I will post it as soon as I get back from work.

CZOLG · #14 Post by **CZOLG** » Thu Jan 31, 2008 2:14 pm

Those are the voltage values I use successfully:

6 - 0.700 V

8 - 0.748 V

9 - 0.796 V

10 - 1.068 V

11 - 1.084 V

12 - 1.148 V

14 - 1.116 V

16 - 1.116 V

Those are already quite low values and I probably could go a bit lower with the middle multipliers but I really did not bother to test it. I am happy as it it now.
Hope this helps.

djThinkbad · #15 Post by **djThinkbad** » Thu Jan 31, 2008 3:26 pm

CZOLG wrote:Those are the voltage values I use successfully:

6 - 0.700 V

8 - 0.748 V

9 - 0.796 V

10 - 1.068 V

11 - 1.084 V

12 - 1.148 V

14 - 1.116 V

16 - 1.116 V

Those are already quite low values and I probably could go a bit lower with the middle multipliers but I really did not bother to test it. I am happy as it it now.
Hope this helps.

GREAT!!! Thanks CZOLG for taking the time to type the voltages , I will try the setting you have provided.

ulrich.von.lich · #16 Post by **ulrich.von.lich** » Thu Jan 31, 2008 3:34 pm

It must be a stupid question but do those voltages kinda associated with CPU frequencies? I only know the lowest frequency a 533MT/s Dothan can operate is 800Mhz. (600Mhz for 400MT/s Dothans) So does 800Mhz have something to do with 6 - 0.700V? Actually this is the reason I don't use NHC.

aaa · #17 Post by **aaa** » Thu Jan 31, 2008 4:09 pm

ulrich.von.lich wrote:It must be a stupid question but do those voltages kinda associated with CPU frequencies? I only know the lowest frequency a 533MT/s Dothan can operate is 800Mhz. (600Mhz for 400MT/s Dothans) So does 800Mhz have something to do with 6 - 0.700V? Actually this is the reason I don't use NHC.

6x133=800
So assuming he's talking about is T43p with a 533MT/s, it is 800mhz/0.7v.

ulrich.von.lich · #18 Post by **ulrich.von.lich** » Thu Jan 31, 2008 5:10 pm

So 6 is called the multiplier and 133 is the FSB right? What does the voltage do here? Can it be like 800mhz/0.3v or 800mhz/1.3v? Lower CPU voltage = more battery juice??

CZOLG · #19 Post by **CZOLG** » Thu Jan 31, 2008 5:22 pm

The Voltage is locked by Intel when it comes to lowest value, that would be 0.7 V
The lower the CPU voltage, the lower the heat and yes, more battery juice.
I am talking about T43p and the 2.13 Ghz CPU.

Please somebody correct me if I am wrong, but the voltage has nothing to do with the speed of the CPU. It simply is the amount of current that has to be provided in order for the CPU to be operational at a given multiplier. Go too low and the system will crash.

agarza · #20 Post by **agarza** » Fri Feb 01, 2008 1:06 am

CZOLG wrote: Please somebody correct me if I am wrong, but the voltage has nothing to do with the speed of the CPU. It simply is the amount of current that has to be provided in order for the CPU to be operational at a given multiplier. Go too low and the system will crash.

Yes you're right, the speed stays the same regardless of the voltage multiplier currently in use.
My T42p is considerably cool in winter it stays at 42-45C, and max load would be about 63C.

I think doesn't matter that much the speed of the processor, firstly undervolt the CPU with NHC and then put a good thermal paste like Arctic Silver 5. You should not have problems.

Which T43 OR T43p CPU is the coolest? (No Heat issues)

Which T43 OR T43p CPU is the coolest? (No Heat issues)

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