I get the feeling I already know what this is, but some confirmation wouldn't hurt.
I recently built a computer for my brother utilizing an FX-6300 paired with a Gigabyte GA-78LMT-USB3 mATX motherboard. I wanted to overclock, but when I try, the clock speed tends to throttle back to 3GHz pretty frequently.
I've also notice this throttle is often accompanied by a voltage drop. The higher my overclock, the worse it gets. I've tried compensating with LLC, but I really don't have any control of it – there is AUTO, Normal, Extreme. Auto and normal don't do anything, and extreme doesn't really prevent the issue (though I notice less frequently), but I get massive voltage spikes (as high as 1.38v from 1.25, already upped from stock 1.15v). I should also note the voltage drops have been equally extreme, as low as 1.00V.
Temperatures have also been good, the highest reached was 65c, but that was at a 4.2GHz , with 1.275v, extreme LLC, no turbo, all power saving features disabled. The OC I was aiming for never got 56c, 1.17v, 4GHz even, but, again, throttles back to 3GHz pretty often. This even happens at stock settings, but not that often, will usually stay at base speeds of 3.5GHz, but very frequent voltage drops that aren't normally accompanied by clock speed drops as well.
TL;DR – My clock speeds and voltages are jumping all over the place. WTF?
Set the LLC to Extreme for gigabtie mobos as for the GA-78LMT-USB3 its a nice starting point mobo for a standard computer its not for heavy use or overclocking its a rehash of a very old AM3 motherboard to take new AM3+ cpu's and it only has a 4+1 power phase.
Well, my main concern with that is the voltage spikes, which are well beyond the spec I set. I'm not really aiming for a heavy OC, if I can get 4.2GHz base, I'd be happy, which I'd expect is completely reasonable given the FXs can get 4.8GHz fairly easily with good air cooling. I'm hoping the mobo is up to snuff since it should be using some quality VRM components (UltraDurable, right?), and it does have cooling, and it does support 125W TDP.
I guess I really shouldn't be too concerned with voltage spikes given the reviews I've read seem to indicate that the FX CPU's beg for more voltage and better cooling.
Nope like i just sead that motherboard is NOT for overclocking technically isent even a AM3+ motherboard its a old motherboard that was originally intended for AM3 chips and thay just slaped on a cuple of usb 3.0 ports and gave it a new bios.
agree im totaly not a fan of gigabyte am3+ boards in general. But those lower end boards are just totaly not made for overclocking at all. the 4+1 powerphase and analog vrm´s its just lack.
For an FX6300 i allways recommend a Asus M5A97 R2.0 board as an entry level board.
Yeah... Not as good as I hoped. Budget was pretty tight, and so was space for an mATX form factor. I considered Intel and other AMD options, but the sheer value of the FX-6300 was too enticing.
I had a similar issue with my 6350 when i OC'd it. I think it had to do with some power saver settings in the bios,.. though your milage may vary as you have a different mobo than I. I have the 990FXud3 and it's able to keep it stable a@ 4.8Ghz +.075V
