FX-8350 frequency drops for short time under load

[Snowman66]

Hello, I have this weird problem, my CPU drops to 1406 MHz for couple of seconds and then goes back to 4000 MHz while I'm playing games
CPU temp max - 54 C, Mainboard - 34
I had a stock cooler for some time and used CPU in 3400 MHz mode, everything was fine
now I use 212 EVO for cooling CPU and this problem appeared
motherboard - asus m5a78l le
power supply - Cooler Master GX650
GPU - gtx 670
SSD - samsung 840 evo 250 GB
so I searched for solution but still nothing
do I have a bad motherboard maybe?

 

[Dark Lord of Tech]

It's normal , power saving mode.

 

[Dark Lord of Tech]

You can disable these in the BIOS if you want t to run a full all the time : C1E, Cool n Quiet and C6.

Because of the boards poor power and thermal design , I wouldn't disable them , but that's up to you.

 

[GhislainG]

You wrote "I had a stock cooler for some time and used CPU in 3400 MHz mode, everything was fine now I use 212 EVO for cooling CPU and this problem appeared motherboard - asus m5a78l le" How are you cooling the VRMs? They used to be cooled by the cooler, but you now need to add a fan to cool them. What you get is throttling to protect the VRMs that are getting too hot. To make matters worse, you are overclocking on a motherboard that isn't designed to do it. Run the CPU at 3400 MHz, cool the VRMs and your system will work fine.

 

[bmacsys]

It's normal , power saving mode.

His cpu is under load so I would say he is getting some thermal throttling. His mobo is 4+1.

 

[Dark Lord of Tech]

Because of the boards poor power and thermal design , I wouldn't disable them , but that's up to you.

That's why I added this ^

That board shouldn't be listed as compatible with a 8350.

 

[GhislainG]

The board is compatible as long as the VRMs are cooled. The overclocked CPU exceeds the 125W limit and that's why it has to throttle. I still can't figure out why people buy cheap motherboards with such power hungry processors.

 

[Dark Lord of Tech]

+1 ^

 

[Snowman66]

hey, but how do I put a fan over VRMs if huge 212 is in the way? could you please show me some kind of example?

 

[GhislainG]

A Noctua NH-C14 would be a much better cooler, but it's expensive. Is your case limited to micro-ATX or could you install an ATX motherboard? There are excellent ATX motherboards that will allow you to overclock to 4.0 GHz or more without throttling. Installing a small fan that blows on the VRMs is difficult due to the large cooler. Not overclocking to prevent throttling is a free solution.

 

[Snowman66]

You wrote "I had a stock cooler for some time and used CPU in 3400 MHz mode, everything was fine now I use 212 EVO for cooling CPU and this problem appeared motherboard - asus m5a78l le" How are you cooling the VRMs? They used to be cooled by the cooler, but you now need to add a fan to cool them. What you get is throttling to protect the VRMs that are getting too hot. To make matters worse, you are overclocking on a motherboard that isn't designed to do it. Run the CPU at 3400 MHz, cool the VRMs and your system will work fine.

would you recomend a new motherboard? like Asus Sabertooth 990FX R2.0?

 

[GhislainG]

Absolutely.