FX6300 Underclocking Under Load

aliensarecoming · Aug 30, 2014

Hi guys,

I've been having some issues with the AMD FX6300 since I bought the damn thing last year.

Currently I have an overclock of 4.4Ghz, with my voltage set to 1.43v. All coolnquiet and CStates are disabled.

Under idle, the CPU will sit at the 4.4 quite happily, but as soon as I run OCCT for around ten seconds, one core will drop down to 3Ghz, then another and so on, until all 6 cores are running at that speed. Then, once the CPU hits 50 Degrees, all 6 cores will drop down to 154.7Mhz for a few seconds. After this, the cycle will repeat.

I've tried two different ASUS motherboards, tried Windows 8.1 and Windows 7, and I can't shake the feeling that I should've just stuck with my 965BE

Below is an image showing the problem.

Is it just something stupid I've missed? Because I really don't know where to go from here.

Thanks for reading.

rolli59 · Aug 30, 2014

What motherboard are you using? It can be forcing throttle although the CPU temp is fine.

aliensarecoming · Aug 30, 2014

rolli59 :

Cheers for the fast reply, the motherboard I'm rocking is the craptastic M5A78L-M/LX3.

rolli59 · Aug 30, 2014

If you look the board up here it has a TDP limit of 95watt http://www.overclock.net/t/946407/amd-motherboards-vrm-info-database
It will run your CPU at stock but when you overclock the boards VRM's will downclock the CPU since they can not handle the power draw. At least it is Asus so it does not simply burn like some MSI boards in same class.

aliensarecoming · Aug 30, 2014

AH! This is both fantastic and disappointing news, thank you!

Would it be safe to just run the chip at the overclock it's running at, and just leave it to downclock? As it only really does it in CPU stress tests...

rolli59 · Aug 30, 2014

I personally would not run it OCed on that board but if so only mild. A better board would handle that OC just fine.

aliensarecoming · Aug 30, 2014

rolli59 :

Urgh. Yessir.

I'll buy me another M5A78L-M/USB3 and run it stock til then. *shudders*

Many thanks, have a great day now.

manicd · Aug 30, 2014

I only needed 1.36v loaded at 4.4ghz. Also putting heatsinks or a fan on the VRM's will make a difference. Turn off Turbo/Core boost. Turn off APM.

bmacsys · Aug 30, 2014

aliensarecoming :

Look no further. Get a UD3P. Cheap and won't get thermal throttling anymore.

aliensarecoming · Aug 31, 2014

manicd :

Really?? Holy crap. I'll try with your voltage and see where it gets me.

I have two 120mm fans on my side panel, but you're right, I'm sure it was getting pretty toasty.

All turbo core and APM crap was off.

Update - I have tried 4.4 @ 1.38, it seemed okay. Then I went into hwinfo and saw that my motherboard was hitting 50 degrees. I'm going to leave the CPU at stock for now

aliensarecoming · Aug 31, 2014

bmacsys :

Nice board, but I'm planning a Bitfenix Prodigy M build for the future, and I think I'd struggle fitting one of those in there

Know of any better mATX alternatives to the M5A78L-M/USB3?

rolli59 · Aug 31, 2014

aliensarecoming :

bmacsys :

Nice board, but I'm planning a Bitfenix Prodigy M build for the future, and I think I'd struggle fitting one of those in there

Know of any better mATX alternatives to the M5A78L-M/USB3?

No good AM3+ boards in the mATX form factor, that one is one of the better with 1 gigabyte board.

manicd · Sep 2, 2014

I'm using the gigabyte 78lmt-usb3 rev 5.0, It's the vest mATX board available right now. It has a heatsink on the VRM. It's not the best board for overclocking but will handle medium overclocks very well. Haven't heard of anyone frying their's. There are other mATX that were made with the 880 chipset but you would have to buy used or "new" from ebay or from unkown vendor through amazon.

aliensarecoming · Sep 2, 2014

manicd :

Yeah, I saw this board, my other option is the M5A78L-M/USB3, which has 140W CPU support and the capability to overclock the memory... But I may well go for one of these

I won't be watercooling or anything, so the overclock won't be that serious.

rolli59 · Sep 2, 2014

Yep those two are the best mATX boards, one from Gigabyte and one from Asus.

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