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Cpu is running slower after i cleaned the fan

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Ok, so i started getting a thermal warning from my mother board so i took off one side of the case. Everything started up fine. Then i decided to clean the cpu fan because i saw a lot of dust around it. So i did and i realized there was A LOT of dust in there so i cleaned it up. I'm still getting lower fps in games. Then i decided to swap out of the stock 300w psu with a 500w psu and I'm still not getting any better performance. What could be the problem?

Motherboard - Intel D945GCL
OS - Windows 7 32 bit
CPU - Intel Pentium Dual Core 3.20ghz
RAM - 4gb
Video card - Geforce 9500 gt
Stock psu was at 300w
New Psu - Rosewill RD 500-2DB at 500w

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i have the same problem.
i have a malfunction temperature sensor on my cpu, it shows 75 °C on idle, 104 °C on load (over TJMax but no shutdowns)
even though when i touch the heatsink its like 55 °C not more. but because of that, the cpu/bios thinks, it will overheat, and it throttels down the cpu. for me its from 2,79 Ghz to 1,99 Ghz, and i get fps drops in games.

unfortunately, i don't think so. i have a same thread open in the graphics & displays here on tomshardware. i searched on google like 1,5 days for this, there is no way to disable cpu throttling :/  it annoys me too
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How old is the system? Could any fans be wearing out? Whats the airflow like thru the power supply? The temperature?
The CPU heatsink may need new thermal paste, or a new fan.
As I recall the 945 used a case with side duct and depended in part for the power supply to cool the case, which some newer more efficient PSUs do not.
There were ways to add a fan to the duct at the side pane.

The D945GCL supports another fan installed inside as well. I've done that, but also replaced the noisy Power Supply fan w/a larger newer one that pulls air thru it...WHOOSH! I keep the auxillary fan blowing on the graphics card heat dissipator(regardless of a tiny fan on it) and service my processor fan every 6mos(Summer/Winter). At general idle w/E6700 C2D, 38-45C temps....intense game interchange(for this mobo) 55-62C temps....good luck!
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