Inspiron 1525 CPU upgrade to T8300 ES

Hello, everybody!

Some time ago I've bought Inspiron 1525 with T5250 CPU. It was performing well, except for any 3D gaming due to X3100 integrated video (the person who uses it doesn't play much, but still...). So to make it handle at least simple games I've decided to upgrade CPU and purchased T8300 ES (QZOL) from eBay, this CPU is the same as normal T8300 but with twice as much cache. I would've purchased normal one, but it was cheaper from auction.

Yesterday I've installed it and I must say it works good, with a small utility I switched some games vertex processing to software and they're at least playable now.

But I've noticed some problems:

1. With T5250 idling fan was turning on only once in a while for a short time, maybe once in 5 or 10 minutes for something like 15 seconds. With this new CPU fan is almost constantly on, it's not at full speed, it does spin up under load and spins down when idling, but stops only when idling for several minutes and only for several seconds. As all tools I've tried fail to read CPU temperature I checked it by hand )) right after shutdown, thermal pipe was cool as was the CPU.

2. RMClock detects CPU and is able to switch P-states but fails to read any temperature, or as it appears to me control CPU voltage. After some experiments I've noticed the following:
a) raising P-state leads to faster fan rotation, it appears (as expected) to makes CPU hotter and fan goes up, so I think P-states are working. P-states defined in RMClock are also shown in CPU-Z correctly.
b) raising/lowering VID does not affect fan in any way. I've tried to max VID for lowest P-state, forcing that state for CPU expecting that fan will go up, but it doesn't. I've also tried setting minimal VID for highest P-state expecting system to crash, but it didn't.

So, can anyone describe how fan works on his/her Inspiron 1525 with T8300? Does it also spins constantly?

And also can anyone with T8300 CPU who uses RMClock provide me value of the following registry key: HKEY_CURRENT_USER\Software\RightMark\RMClock\CPUID. So I will try to force RMClock to think that I have normal T8300 and see if it will work differently.

Thanks in advance!

Vitaliy.

 

If I recall correctly, a lot of ES chips don't have working temperature sensors. Your fan spins up and down depending on a number of readings, CPU, chipset, GPU, and so on. If you're missing one of these readings, I'm not surprised that it's throwing your fan operation out of whack.

That being said, i8kfangui should work with the 1525. Have you tried it?

 

I have Windows 7 x64 so i8kfangui doesn't install as it's driver is not signed. But I've just found several tutorials on the matter so I'll give them a try. Thanks!