AMD Fx quad core prosessor after bios update

The simple answer is "YOU" can't fix it without replacing hardware. Its a 125 watt processor in a Motherboard that is only rated for 95 watts. You're more than likely going to damage something, if you haven't already.

The company that built my pc is going to pick it up and replace the mobo and cpu

Just got hold of the company I purchased it off, he said my cpu underclock could be due to ram errors and asked me to take a ram stick out and test it, then do the same again with the other one using mem test. Could a error with a ramstick actully cause cpu underclocking??

Also when I told him the ga-78mlt-s2p rev 4.0 does not support the amd fx-4170 quad core cpu acording to the gigabyte cpu compatability tab on there website, he just said "it is supported but the website is not updated compatabilitu. Tab yet" had a ticket open with higabyte for 3 days now... They not responding, can u guys help clarify any of this please

The CPU compatibility list I looked at did not list any processors higher than 95 Watts. If that board supported a 125 processor I would expect at least one to show up on the list somewhere. A BIOS update cannot make a motherboard support a higher wattage processor than it was originally designed for. It can add support for processors released after the board was released but those processors still have to be compatible with your motherboard. The motherboard has a maximum clock frequency, thermal limit, etc. A BIOS update will not change that. There are AMD FX processors supported by your motherboard, but the one you have in it is not. Gigabyte can confirm this if they ever get back to you. The company that built your system should know this also. The BIOS update is simply adding code that lets you BIOS identify the currently installed processor and set the correct timings automatically. If it doesn't have the code to properly ID the processor it may default to basic timings or use incorrect timings. Usually you get a BIOS error message saying "Processor not supported" or something similar.

Yes and no on the CPU support alpha. There are three revisions of that motherboard (3.1, 4.0 and 5.0), with only the 3.1 supporting 125W CPU's,

GIGABYTE TECHNOLOGY Socket AM3+ - AMD 760G - GA-78LMT-S2P (rev. 3.1)

GIGABYTE TECHNOLOGY Socket AM3+ - AMD 760G - GA-78LMT-S2P (rev. 4.0)

GIGABYTE TECHNOLOGY Socket AM3+ - AMD 760G - GA-78LMT-S2P (rev. 5.0)

and all three use a different bios.

With that said, demongorgan which revision is your board? You can find it stamped on the board here,

OK, good observation there stormy. I went by the "GA-78LMT-S2P rev 4.0 FDa" the OP posted in the first post. I Googled it and one of the links took me to Gigabyte. The CPU list I got there only listed 95 watt CPU's. We'll have to wait for the OP to confirm what exact version they have. Hopefully they didn't flash with the wrong BIOS?

Dosen't the Op say REV 4.0 ?

Na its the right bios update, fda os an update for steam games acordimg to gigabyte who replied to me today, somthing todo witj compatability issues,

They also confirmed what yoi guys said about beong. 95w only,,

The company I purchased it from lied saying ot is compatable and that I would habe to pay repair fees!

Well umtill now I hope, as ive told them that gigabyte told me it isnt, also sent them a copy og what gihanyte daid, aaand puy in they sold me a deffective product. And some false afvertising with somr misleading info and thay I wany mobo replaced or o I will contact ebay and push it through that way,

I am being fair reguarding the company right? I mean there business is making pcs so they should know.

Sorry for poor writing. Walking home using phone lol