CPU Voltage Drop Help??

Liamalxd · 4 Jan 2011 at 23:41

Ok guys, so i have my amd phenom ii 955 OC stable to 4022.7mhz @ 1.500V (211.7mhz x 19.0mhz)

but while running prime95 (64-bit) the cpu voltage drops to 1.116V the multiplier to 4.0x and clock to 846.9mhz

Whats going on?

p.s - my ram is at 1410mhz (from 1333mhz)
and my HT link is at 2117.0mhz

never had this problem ever with any overclock :/

cammy5477 · 4 Jan 2011 at 23:48

whats the temps....

sounds like its being throtled possibley to save the hardware

Liamalxd · 4 Jan 2011 at 23:49

cammy5477 said:
whats the temps....

sounds like its being throtled possibley to save the hardware

my h70 gets to 50 C ... and my northbridge is at 41 C

cant be that bad :/

cammy5477 · 4 Jan 2011 at 23:54

can you run coretemp beside prime95 and double check the results....

does this just happen under 100% load?

Jamiman · 4 Jan 2011 at 23:58

Thats AMD PowerGo (or Powernow, whatever).

Basically, it drops the multiplier and Voltage to save power when the CPU isn't overstressed.

You can disbale it in the bios.

Liamalxd · 4 Jan 2011 at 23:59

cammy5477 said:
can you run coretemp beside prime95 and double check the results....

does this just happen under 100% load?

Ok maybe my board is abit new, it wont detect temps in coretemp (0 C)

And the VID reads at 1.3V then drops to 0.925V
(in speedfan and bios they read as 1.5V and drop to 1.116V

hmm...

cammy5477 · 5 Jan 2011 at 00:00

Jamiman said:
Thats AMD PowerGo (or Powernow, whatever).

Basically, it drops the multiplier and Voltage to save power when the CPU isn't overstressed.

You can disbale it in the bios.

if its running prime95 at 100% a core id say it was very stressed

Liamalxd · 5 Jan 2011 at 00:00

Jamiman said:
Thats AMD PowerGo (or Powernow, whatever).

Basically, it drops the multiplier and Voltage to save power when the CPU isn't overstressed.

You can disbale it in the bios.

Every core is running at 100% ... i think thats 'stressed' lol

cammy5477 · 5 Jan 2011 at 00:03

liam try dissabling it in the bios like jamiman suggested sounds like thats what it is....intel have something similiar called speedstep

Liamalxd · 5 Jan 2011 at 00:10

cammy5477 said:
liam try dissabling it in the bios like jamiman suggested sounds like thats what it is....intel have something similiar called speedstep

Ok just gone into bios no such options exist but i've made sure cool'n'quiet and all that jazz is disabled...

just tested it now and its done it again ... hmm

its not windows either my power settings are maxed out ... hmm.

Orcvader · 5 Jan 2011 at 00:28

What motherboard are you using?

The motherboard VRMs might be overheating.

Liamalxd · 5 Jan 2011 at 00:40

Orcvader said:
What motherboard are you using?

The motherboard VRMs might be overheating.

an asus m4a87td

just clocked it down to 3965mhz and it only does it as soon as the cpu hits 51 C

weirrd ...

Liamalxd · 5 Jan 2011 at 00:47

Ok so i even clocked it down to 3800mhz and as soon as it goes over 51ish it clocks down

it must be the VRM's since my mobo doesnt have a VRM cooler

any ideas where you can buy one?