G51 GPU and THRM temp rises after only changing CPU..

I just swapped my P7350 for a T9600 in my G51. I took off the CPU heatsink and removed the rock hard crud that was on the CPU heatplate and replaced it with some AS5 once I changed the CPU. The northbridge has a purple thermal pad on it, so I just left that alone. Once I did all this I put everything back together. I didn't even touch the GPU heatsink....but...once I turned on the laptop and ran L4D for about 5 mins my THRM and GPU temps have gone up for some reason.

These are my temps after 5 mins



First of all is THRM the northbridge?? If not, what is it?

The highest it ever went up to was 59C and that was after more than just 5 mins of gaming. That's a 12C increase and it'd probably go up even more if I game for longer.

My CPU max was about 55C before, so CPU temps aren't a problem.

My GPU max was 89C before, and like the THRM, this was after at least an hour of gaming. But only 5 mins into gaming and it's gone up to 93C! Like I said, I didn't even touch the GPU heatsink.

Any idea on what's going on? Is the THRM temp increase affecting the GPU temps somehow?

P.S. If anyone's wondering, the P7350 definitely does bottleneck the laptop in some games. In L4D2 for example on full settings, it's almost always on 60fps now and never seem to drop below 40fps, whereas with the P7350 it would jump around between 30-60fps, sometimes going below 30fps when things got really messy. With the HL2 stress test, I got 186fps average on the P7350 and now get 232fps average with the T9600. A lot of games won't see much of a difference though. I think I've gained about 5fps in Company of Heroes. Don't think I've gained anything in Crysis.

Edit: Doh, forgot to change my TJ Max on HWMonitor! The P7350 has a TJ Max of 90C and the T9600's is 105C so add an extra 15C to my CPU temps. That would make my CPU temps around 62C max, 8C more than what the P7350 had, not 8C less. (see post #7)

 

I wish I could answer your question for you man. I'm in the same boat except I opened up my gpu on accident. I have a T9900 in mine, and for some reason I am now hitting 107C after just 1 min of l4d. The cpu is fine at 55C, and THRM 65C. I don't understand this at all.

The GPU has a shim around it, I was using OCZ freeze, and now I've tried a thermal pad 1mm, and it gave the same exact results. The weird thing is that the game runs pretty good. I am getting anywhere from 40-100fps on max settings and AF and AA on 4x and 8x. The game is also running smooth and I'm getting no noticeable slowdowns.

Anyone? Does your gpu have a shim around it? Do you have thermal paste or a thermal pad on the gpu die? I am really lost here and I can't seem to get the temperature down no matter how many times I apply new paste.

 

Ah...I forgot about undervolting the T9600.... cause my previous temps with the P7350 was after undervolting. After undervolting the T9600 to 1.0625V (lowest I can go before error/bsod) I got the following temps in L4D after 5 mins.



Ok, so temps dropped but they're still higher than what they were before. Now from all the posts I've read regarding temp changes after upgrading the CPU, a lot of people said there was no change to the temps. And I agree at least for the CPU. My CPU temps are lower if anything. But THRM and GPU temps are higher. I thought maybe it was the extra 800mhz plus the extra power it uses since the T9600 is a 35W CPU while the P7350 is a 25W CPU. So to test this I disabled my multipliers in RMClock up to 7x so that the max is 1.86ghz. Yes this is a bit lower than 2ghz and I could have just underclocked but oh well. So I ran L4D for 5 mins at 1.86ghz @ 1.000V and got the following temps.



My THRM is pretty close to what it was with the P7350 and my GPU temp dropped to 89C surprisingly which is the same max as the P7350. Maybe the extra couple degrees with the THRM is because of the extra 10W since it's still using more power even if it's been undervolted to the same voltage as the P7350 (correct me if I'm wrong here). At least the CPU temps dropped.

So I guess I could hypothesise that the temp changes in the THRM and GPU are because of the T9600's extra hunger for power. I could verify this by putting my P7350 back in to see if the temps go back to what they were before. When I have time maybe I'll do this.

Well I can't really help with the GPU since I haven't touched it so I don't know what I've got. I've read that some people have a thermal pad on the core while others have thermal paste. There should be thermal pads on all the memory modules and I read that these shouldn't be removed or replaced at all because your temps will sky rocket otherwise. If you've only changed the core's thermal paste and your temps are still going that high, I'm really not sure what the problem could be.

Maybe try what I did; disable the multipliers or underclock the CPU to 2Ghz, then see what GPU temps you get. If they drop a lot, then you know it's the CPU. I don't think the CPU would affect the GPU that much though....I mean they share the same heatsink and fan pretty much so it's a possibility.

 

Check your paste job. The heatsink doesn't fit flush with the GPU core, so you need either a shim or a thicker layer of paste to remedy that.

 

I put new paste on the Northbridge, and removed the blue pad that mine came with... If I had to guess, that's where your extra temperature is coming from. Not sure, but I'm runnin a T9300 and even with it overclocked to 2.9ghz, my THR and CPU temps stay at or below what I had stock. I can only assume the MX-3 paste is that much better than the stock paste/pad.

 

+1. Your Cpu overclock is raising your NorthBridge temps too, since the FSB has to be raised for the OC.

 

Well that stock crud that was on the CPU was terrible. It was so rock hard I had to use a knife to carefully remove it. No wonder it was so damn hard to remove the heatpipe...it was practically glued to the CPU. It felt like I was going to break something seeing how hard I was pulling. I was going to get some IC7 but seeing that I have like a 3/4 full tube of AS5 I just used that on the CPU. It did a really good job too. CPU max was about 55C before, now it's 47C.

Anyway, another reason why the temps could have gone up is because the northbridge's thermal pad may have lost some contact after removing the heatsink once. I noticed some tiny specs of the thermal pad were on the chipset, so maybe when I put it back on, those specs didn't fall back exactly onto where they were on the thermal pad before, leaving tiny areas with less contact. I'm only guessing hear and don't know how much of a difference this would actually make.

Edit: Doh, forgot to change my TJ Max on HWMonitor! The P7350 has a TJ Max of 90C and the T9600's is 105C so add an extra 15C to my CPU temps . That would make my CPU temps around 62C max, 8C more than what the P7350 had, not 8C less.

This could mean 2 things. Either the AS5 is crappier than the stock paste that was on the CPU, increasing CPU temps which in turn increases THRM and GPU since they all share the same heatsink/fan pretty much. OR the T9600 just runs 8C hotter for the CPU since it's more power hungry which in turn has increased the THRM and GPU temps.