What is the third chip on the M1530 mobo

CPU is on the top of the image, GPU (nvidia) on the bottom right. What is the third chip on the left?

http://i1202.photobucket.com/albums/bb371/SASfashion/DELL%20M1530/M1530%20mobo.jpg

I recently mounted a new heatsink and wasn't sure what this was but treated the chip with the same clean up and paste as the CPU and GPU. Though it's irrelevant, the new heatsink didnt solve the problem (will start a new thread to address the issue).
Reply to saas1980
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More about chip m1530 mobo
  1. that would be the chipset.
    https://en.wikipedia.org/wiki/Chipset
    the chipset is like the bridge between the system and the CPU. the chipset used to be separated into two chips the north bridge and the south bridge.
    now one is on the CPU itself leaving just the one chip chipset on the motherboard
    Reply to R_1
  2. I am guessing the chipset temps are minimal compared to the CPU/GPU, right?

    My temps are too high and the machine now tends to turn off. Since it's an extra machine lingering around the house, I plan on adding large heatsinks to the CPU and GPU. Basically no more portable laptop, the idea is a custom built desktop machine to play movies, browse the web and other basics (hdmi'ed to the tele). How concerned should I be with the chipset temps or are there any apps to measure the temp? Currently using Harware Monitor which is limited to CPU and GPU sensors only.
    Reply to saas1980
  3. the south bridge or the chipset does not really get hot compared to the GPU and CPU. it shares the same cooler as the GPU and the CPU right? most chipsets can be passively cooled.
    Reply to R_1
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