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CPU not running at 100%?

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April 24, 2013 11:44:21 AM

Hello everyone, I noticed something when i was playing FSX (Flight sim 10). Im not sure if most of you know this or even use this software but ill cut to the chase. FSX is VERY CPU dependent so I got the i5 2500K and overclocked it to 4.5ghz where it is stable and it works great. However, today i noticed some lag in my game and i wasn't sure why, so i checked in my task manager and saw that my cpu wasn't running at 100% (only between 50 and 70%).

Today was a hot day and I dont have air conditioning so it was pretty hot up here so my theory is that the CPU wasnt running full power to prevent itself from overheating? Im not sure of this is possible but i don't know why my cpu want running at full power in a CPU demanding game. Could someone explain to me what might be the cause? Thanks!

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a b K Overclocking
a b à CPUs
April 24, 2013 11:47:36 AM

Get gpuz and check your gpu usage. Even cpu demanding games can be bottlenecked by a slow gpu.
April 24, 2013 11:53:02 AM

The 2500k is quite powerful !
It's quite possible that although your CPU was not being fully used, your RAM/GPU (and in rare cases eves the disk) was, and as a result, your game was not running as per expectations. try looking at the ram and gpu usage as well during the game.
How much RAM do you have, and what GPU ?
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April 24, 2013 12:01:03 PM

abhinavjha92 said:
The 2500k is quite powerful !
It's quite possible that although your CPU was not being fully used, your RAM/GPU (and in rare cases eves the disk) was, and as a result, your game was not running as per expectations. try looking at the ram and gpu usage as well during the game.
How much RAM do you have, and what GPU ?


For RAM I have 8GB (when i checked usage it was at about 4.5gb) and for gpu i have AMD Radeon 6870 1GB but i haven't checked the usage during the game. But it has been said (i don't know if this matters) that FSX barely uses the GPU in game so im not sure if its that slowing it down. But whats intresting is that i usually get great performance. Anyways ill be moving my PC to my basement in a couple days where it is very cold/cool so ill see what happens and maybe go a little further in the overclock.

April 24, 2013 12:06:47 PM


Hmmm... everything sounds fine... do post again after testing FSX in the basement
a b K Overclocking
a c 89 à CPUs
April 24, 2013 12:11:36 PM

FSX is really old, so it may not be the best at taking advantage of extra cores. If you see two cores more or less maxed out, and the other two with fluctuating loads, that's about as much as could be expected.
April 24, 2013 12:19:35 PM

abhinavjha92 said:

Hmmm... everything sounds fine... do post again after testing FSX in the basement


Alright no problem. And when you say everything sounds fine, what do you mean? Like is it normal for it not to be running full speed or just everything is fine and it should be running full speed?
April 24, 2013 12:25:03 PM

artie711 said:
abhinavjha92 said:

Hmmm... everything sounds fine... do post again after testing FSX in the basement


Alright no problem. And when you say everything sounds fine, what do you mean? Like is it normal for it not to be running full speed or just everything is fine and it should be running full speed?


I mean everything is fine and you should be able to run in well, although as sakkura said, FSX might not be using all the cores, but even at 2 cores FSX should run fine so... just post back after trying again.
Sometimes even the most fatal problems can be solved by cursing and restarting the computer. :) 
a b à CPUs
April 25, 2013 4:49:24 AM

*sigh*

If the CPU is getting all its work done, it won't run at 100%. Simple.
!