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M3A78-EM. 260 max fsb with lowest multipliers. what's wrong?

post #1 of 3
Thread Starter 
my hardware defaults-
athlon x4 620 (2.6ghz)
4x1gb ddr2 667 5-5-15-20
M3A78-EM mobo
600W 80+ psu.

I have oc'd cpu all the way up to 259 FSB. Runs prime95 ok.

Since I am only trying to find the max speed of the cpu, I have set ram to lowest setting. 3/4 divider, 200mhz, 6-6-6-15-20

I have dropped both NB and HT to 7x multi.


FSB 260 = will not POST.

BUT..... I lower cpu multi to 7x, so cpu runs at 260x7 = 1.82ghz
NB and HT still at 7x......default voltages, and it still won't POST.

Now my rig has-
1820mhz HT
1820mhz NB
1820mhz cpu
but will not post.

can anyone think of why it won't post even when everything is underclocked?


259... no problem.....

Edited by pman26 - 12/31/10 at 3:42am
post #2 of 3
Your memory or the mobo.
HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
  hide details  
Reply
post #3 of 3
Thread Starter 
yeah, i think it's the ram.

somehow the high fsb makes it fail, even though it's running below default speed.

i had to change every single ram timing to the slowest possible option in order to boot.

my settings are now laughable....
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