Big problem with Aspire 8735G and X9100

I have a big problem with my laptop that I want to sell in some days. 6 months ago I bought a X9100 C0 CPU and used it with Throttle Stop.
Now without Throttle Stop and without OC I noticed a big throttling to 1,6 GHz or 0,8 GHz when the CPU load is a 100% for some seconds
for example in prime95 or BF3. I also had this issue with a T9600, but only on prime not in games.
When I put load on the cpu Everest Ultimate Edition reports a CPU temp of 94°C after about 5 seconds in load. The cores are about 70-75°C at that point.
Speccy reports also 94°C but at the motherboard temp. The 94°C don't go down when it's throttled to 800 MHz. When I put prime off the temperature goes down from
94 to about 75. What can I do? Who can help me?

Edit: Another guy with the same laptop and X9100 had the same problem.

 

Probably need another quality TIM application (quality on both the TIM and the application method, btw).

 

I will reapply the paste, but I don't think that will help, because the paste is nearly new.

 

OK, thanks. It worked.

 

This is very peculiar. I suggest you directly contact unclewebb (the developer of throttlestop) for advice.
Do you know where the motherboard temp is measured? If it's measured at a bridge it could be trouble with your mobo.

 

I think it's not a problem with Throttle Stop. It's a problem with the PC itself or the thermal paste. With new thermal paste it worked without throttling correctly even without a cooling pad.
I don't know which tool is right. Speccy reports a MB temp that's exactly the same with the CPU temp in Everest.

 

And now it throttles again...

Edit: Where is this sensor on the mainbaord? Maybe on the chipset? Can the chipset cause this throttling?

 

I think your north-bridge is the one that has a temperature sensor.
I had a similar issue with my laptop and X9100 (the C0 revision) after using it for the first time.
The CPU itself was working on expected temperatures, but the chip-set/motherboard was reaching 95 degrees C (and on few occasions it went up to 105 degrees - at which point the laptop automatically shut down).
After several re-adjustments and new applications of thermal paste, I was able to bring down the north-bridge temperatures in line with the CPU.
But then the CPU decided to go berserk, and after 3 or 4 days of fresh paste application, it was reaching 95 degrees C under load (it kept rising).
Bottom line, I tried re-pasting, and the temps would be at 75 degrees C for a few days, but then would start rising again.
It was absurd.
I had to undervolt the CPU to 1.05 V and reduce its operational frequency from 3.01GhZ to 2.6GhZ (the temperatures stayed in the 85 degrees C range).
Ultimately I decided to sell it and get the T9600.
Now it works fine (the second core is about 7 to 9 degrees C above the first one, but nothing that is anywhere near dangerous, and a little adjustment to the heatsink should be able to fix it).

The X9100 is a lot of trouble - especially if its the C0 revision.
E0 is supposedly much better because it doesn't overheat like C0, but its very difficult to find, and if you do, its extremely expensive.

 

OK, thanks for your help. I will get a Core 2 Duo P7450 and sell my 8735G with the P7450. The X9100 will be in a extra auction.

 

me too,will reapply the paste, but I don't think that will help, because the paste is nearly new.thank you

 

P7450?
I'd sooner recommend you get the T9600 and undervolt it (I was able to bring mine down to 1.05V at 2.8GhZ - load temperatures even when gaming don't go over 75 degrees C) because it has 6MB cache which makes it a bit faster clock per clock compared to 3MB cache c2d.

One other thing I wanted to mention was that you could first try undervolting the X9100.
Have you tried that?
Mine throttled as well when I first got it, but that was likely because I have a 90W power brick and the CPU needed just over that.
So, once I undervolted the thing as low as it could go on 3.01 ghZ, the CPU didn't throttle (but the temperatures were still out of whack and growing because it was C0 revision, and my poorly executed cooling just couldn't keep up).

 

there is another part of the laptop that heats too much, thus sends the BDProcHot signal to the CPU and it slows down until the other part cools off.

you can test this with running throttlestop with the BDProcHot checked and unchecked. I would suggest to leave it on and fix the problem though, rather than leave it off as this may damage the part that heats too much, which in tern does so because of the increased speed that the CPU works with.

 

I've also had issues with C0 X9100 temperatures... I replaced it with a T9900 in the end.

I think it's a good idea to sell the X9100 separately and the laptop with another CPU.

 

Yes a P7450, because I want to sell the laptop. I got the P7450 today and it works fine. I undervolted it and it worked with ThrottleStop, but I can't sell it like that.