Asus M3A79-T Problems

sir-les-mp · 5 Jun 2010 at 23:34

Ive got a problem i believe with my mobo as it will not allow my cpu to run at anything above a multiplier of 4.
Ive been updating my system over the past 4 weeks or so and as part of it i swapped out my Asus M3A32-MVP for the one in the title.
I run an AMD Phenom II X4 940BE cpu and cool the system with water.
Since swapping the mobo,s ive noticed the new one seems to have the cpu Vcore stuck @ 0.992v so when booting into windows the system downclocks my cpu from what ever i set it in the bios to FSB/HTT x multiplier of 4.
Now i have turned off C1E and Cool & Quiet via the bios and also manually set all the voltages i wish to use, i have also set it to overclock the system by 20% which basically ups the FSB/HTT to 240 Mhz instead of 200 Mhz
So the upshot of this is when running windows i get a core speed of 960 Mhz instead of 3.6 Ghz as no matter what core voltage i set it appears as 0.992v
I have also tried running 1, 2, & 3 core's only to see if it was the cpu at fault but each time it booted with the core's i selected at the same vcore and multiplier.
so is there any other settings etc i could check on the mobo to get this running at full speed, as removing it and swapping back will be a complete PINA.

JRS · 6 Jun 2010 at 07:16

Using the latest BIOS? Though the Asus website does list your CPU as being fully supported from quite an early version of the BIOS (0602).

sir-les-mp · 6 Jun 2010 at 10:13

Nope i have tried various versions of the bios currently running version 905, it dosent seem to matter which version i use they all have the same result the vcore seems to be stuck @ 0.992v within hardware manage in the bios and windows once sytem has booted.

JRS · 6 Jun 2010 at 14:47

You say you turned off C&Q, and C1E, and set the voltages. What's your multiplier actually set to?

sir-les-mp · 6 Jun 2010 at 16:50

its set to 15 with and fsb/htt of 240 which should give me a speed of 3.6Ghz and ive set the vcore manually to 1.4v. ive set all the other voltages like northbridge etc to 1.26v
and the mem voltage has been upped to 2.3v as per the dimms i use.
However somewhere along the way the mobo seems to set the CPU Vcore to 0.992v hence why the system is down clocking the cpu multiplier to 4 as there is not enough voltage to run at stock settings nevermind the 3.6Ghz ive dialled in.

thingemajib · 6 Jun 2010 at 17:00

this is the third thread ive seen in a week regarding Asus boards locking phenoms to 800mhz.

The first one identified the problem as a bug in the 6 core supporting latest bios (it would downclock core 0 to 800mhz, but core 1-5 would remain at 3.2ghz, but quad core phenoms cant clock cores seperately, so this affected all four cores), but the OP couldnt roll back the bios. The second one claimed he'd tried many bios versions and got the same problem.

It does sound like theres a problem with asus BIOSes atm...

edit:
http://forums.overclockers.co.uk/showthread.php?t=18150668
http://forums.overclockers.co.uk/showthread.php?t=18151905
http://www.overclock.net/amd-cpus/740576-phenom-ii-955-reading-800mhz.html

sir-les-mp · 6 Jun 2010 at 18:12

ive just tried setting the multiplier to the lowest setting availeable on this mobo which is 8
when booting into windows it is still setting the multi to 4 and the vcore/vid as 0.992v
i defineatly think this mobo is goosed

sir-les-mp · 19 Jun 2010 at 23:31

Ok since i last posted i have bought an AMD X2 5000 cpu from the bay and tested this in the motherboard.
Im still getting the same results of when booting into windows it reverts the multiplier to 4 as if C&Q was enabled.
I have also installed a small 80Gb harddrive and installed my copy of Windows xp pro onto it as a test and it still wont boot with the correct multiplier in windows.