Hey guys!

Okay, so, I have this one, almost 6 years old PC and it's CPU start to overheat during summer.

CPU is ANCIENT one "AMD Athlon 64 X2 4800+" and i also have cooler master hyper tx3 evo ( i thought replacing stock cooler with this one would help, but its same).

So, my questions are:

1. Could that processor cause overheating by itself since it is very old? if so what to do?

2. Would additional vent on hyper tx3 help?

note: I already have 3 case vents, 2x 8mm at BACK and one 12mm at SIDE, all of them are exhausting air out of pc case.

I clean whole case from dust ever 2 weeks or so.
p.s. sorry about spacing, but i find it more readable. thanks in advance.Its more probable that the thermal compound has dried up.

I have 2 systems with similar CPU's and while some may claim they are dinosaur old in age, they still run well for everything I throw at them. I have the AMD Athlon 64 x2 4450B ( 2.3Ghz overclocked to 2.53Ghz ) and AMD Athlon 64 x2 4850e 2.5Ghz and they idle around 37C right now with stock coolers ( solid chunk of cast aluminum ) and the only one that runs warm in the overclocked Athlon 4450B that caps off at 53C when performing burn in tests while watching Speedfan temp results.

I'd remove the heatsink, remove the old thermal compound, and then apply new thermal compound such as arctic silver, and reapply heatsink, and then see where your temps are at. This may fix it.

Additionally there have been some AMD CPU's from this ERA that have bad thermal couplers inside and so they will report wrong temps. This is the case if right at boot its reading like 118C and the system hasnt even had a chance to wam up yet. Because the thermocouple is internal its only replaced by swapping out the CPU, but as long as the system doesnt shut down as a result of this, then I'd run it as is as long as new thermal compound applied and CPU fan is spinning to blow away the heated air.well i did reapply thermal compound like 2 months ago and until summer temps were never above 60*c in full load. Now at summer at night its stable around 65*c, but during hot day it does 80+ i didnt check how far it goes, but i assume until shutdown.Curious as to what your room temp is at that this COMPUTER is operating in?

Also, are you overclocking this or running normal clock?  Some motherboards can dangerously wig out and overclock on you if cmos battery is weak etc, but it usually gives other indications like lost date/time etc.Hot day so meaning your environment temperature must be high. This so much affects your device especially in your CPU which is above normal temperature(<50C). CPU usually heats the highest because it does everything from the user. CPU age doesn't matter much. What causes heat is environment temperature and the activities of your device like playing multimedia or gaming. Additional heatsinks would help and try minimizing your computer's power usage when the day is hot.

 DaveLembke, it's summer so warmer than usual, room temp is around 26*c or so... i did not overclock it, settings are like at day when i bought it.

eQuilibrium, i am not sure what do u mean by additional heatsinks.

Also, reason why i asked is it possible for cpu to overheat is few years ago it could run any game on stock cooler during hot day without overheating.

Could low quallity thermal compound like(cooler master that comes with cooler or Titan Silicone) cause overheating in hot days?

And last hyper tx3 is not really polished, so i dont know did i put good amount of thermal compound, could more than enough cause overheating?Things to consider for an overheating desktop computer is:

1.) Room computer is in is too hot or computer is baking ( black computer case in the direct sunlight by the window...etc ) and inadequate or clogged with dust cooling vents. ( Sounds like you already makde sure case had proper airflow )
2.) Dry Thermal Compound ( You checked/replaced this )
3.) Heatsink Heatpipe or Fan Failure or heatsink not property latched down and instead is leaning vs flat to CPU surface ( It sounds like you replaced the heatsink and are having same issues )
4.) Not adequate thermal compound ( Generally a droplet about the size of a rain drop of it center to the CPU and then heatsink applied is plenty )
5.) Motherboard is overdriving the CPU - Overclock ( You confirmed that this is not the case )
6.) Power Supply Failure - Over Voltage ( Check your voltages to make sure that they are correct as for a power supply can fail and allow too much voltage to be applied to devices leading to overheat condition ) * Some BIOS's have where you can look at system monitor that will show voltages. Confirm that all look correct. If your motherboard does not have this you can swap out the PSU and see if that cures this.
7.) Bad or Out of Tolerance Voltage Regulator 'VRM'   ( Motherboard with a bad voltage regulator is allowing too much voltage to be applied to the CPU. )How much Thermal paste did you use? You can use too much as well as too little.This has been covered pretty well. The ambient room temps can play a part. IK have central air, but this corner gets hot and as result, my CPU temps may rise 5c. As for the Thermal compound, it's sole purpose is to fill in the tiny cracks on the cap left from the maching process. If you put it on like you are icing a cake, you are looking for trouble as it will insulate the CPU and the temps will go through the roof rather than transfer to the heat sink. As I recall, those processors have a high TDP, so they are going to run a bit hotter anyway. Make sure there is no build u[p of dust in the heatsink over the CPU.